AI Agents API Library

Polski · HTML · llms.txt · catalog.json

AI Agents API Library

A curated, machine-readable encyclopedia of third-party APIs and MCP servers that AI agents can call on a user's behalf.

This article is about services an AI agent can operate programmatically, not AI products used by humans through a web UI.

AI Agents API Library TypeAPI & MCP catalog Entries336 Categories29 Official MCP servers234 LanguagesEnglish, Polish FormatJSON, Markdown, HTML, llms.txt Last checked2026-10-19 LicenseCC BY 4.0 (data), MIT (code)

AI Agents API Library is an open, bilingual (English/Polish) catalog of 336 services (each with a last-checked date) in 29 categories that an autonomous AI agent — such as Claude, ChatGPT, Gemini or a custom LLM agent — can use without a human in the loop, after a one-time human step: registering an account and handing the agent an API key, an OAuth token, or a connection to an MCP (Model Context Protocol) server. Every entry records the documentation URL, the authentication method, the availability of an official or community MCP server, and the free tier. The list is not a directory of products with “AI” in their name; the criterion is agent operability, not branding.

Contents

1. Machine-readable access (for AI agents)
2. Inclusion criteria
3. Legend
4. Web search (14) · Web scraping and browser automation (19) · Knowledge and research data (19) · Image generation and editing (10) · Video generation and editing (14) · Speech and audio (13) · Music generation (6) · 3D generation and assets (6) · Architecture, CAD and BIM (8) · Diagrams and software architecture (8) · Design and UI (6) · Documents, OCR and presentations (14) · Translation and language (6) · Code execution sandboxes (10) · Developer platforms and DevOps (12) · Cloud and hosting (11) · Databases (12) · Vector search, memory and RAG (9) · Email, team chat and notifications (10) · SMS and messaging apps (10) · Voice agents and telephony (9) · Productivity and workspace (17) · CRM, support and marketing (8) · Social media (10) · Maps, geolocation and weather (18) · Finance, payments and market data (16) · E-commerce (8) · Automation and integration platforms (15) · Model APIs and inference (18)
5. Related directories and registries
6. Contributing
7. See also
8. References

Machine-readable access (for AI agents)

AI agents should not parse this page. Fetch one of these stable files instead:

Recommended agent workflow: (1) pick the category file, (2) filter by auth and mcp.type, (3) read docs (or llms_txt / openapi when present), (4) ask the user for the credential named in auth_hint.

MCP server

The catalog is also an MCP server with four tools: search_apis (filters: query, category, mcp (official/remote/any), no_auth, free_tier, no_card, auth, min_rating, min_reviews; sort by fit, rating or review count; results carry a reviews_summary of praised and criticised aspects), get_api, get_reviews (user reviews with pros and cons) and list_categories. No key needed. Add it to your MCP client:

{
  "mcpServers": {
    "ai-agents-api-library": {
      "command": "npx",
      "args": ["-y", "ai-agents-api-library"]
    }
  }
}

Claude Code: claude mcp add ai-agents-api-library -- npx -y ai-agents-api-library

No install: remote endpoint (Streamable HTTP, no key) https://ai-agents-api-library.vercel.app/mcp, e.g. claude mcp add --transport http ai-agents-api-library https://ai-agents-api-library.vercel.app/mcp. Listed in the official MCP Registry as io.github.eater2/ai-agents-api-library.

Claude skill and plugin

The skill tells Claude when to reach for the catalog and how to pick a service. The plugin bundles the skill with the MCP server:

• Claude Code plugin (skill + MCP server):

  /plugin marketplace add eater2/ai_agents_api_library
  /plugin install ai-agents-api-library@eater2

• Skill only, Claude Code: copy plugin/skills/ai-agents-api-library/ to ~/.claude/skills/ (all projects) or .claude/skills/ (one project).
• Skill only, claude.ai / Claude Desktop: download the skill zip and upload it under Settings → Capabilities → Skills.

Inclusion criteria

• The service exposes a public, self-serve programmatic interface (REST, GraphQL, SDK) or an MCP server.
• A human needs to act at most once — sign up and create a key or approve OAuth. After that the agent works unattended.
• The interface is documented and currently active (links last checked on the date shown in the infobox).
• Consumer-only apps, waitlists, sales-gated enterprise products, agent frameworks and IDEs are excluded — they are agents or tools for building agents, not services an agent calls.

Legend

• MCP ✅ — official MCP server maintained by the vendor
• MCP ◐ — community-maintained MCP server
• MCP — — no MCP server known; use the REST API
• 🆓 — free tier or free usage without payment
• ★ (date) — proof under the service name: SourceForge rating and review count, GitHub stars, GitHub issues fixed and days to fix, Smithery uses — linked, with the date fetched

Ratings and usage (★) fetched: 2026-10-19 12:08 UTC.

Web search

Search engines and answer APIs that return fresh web results, snippets or full page content in agent-friendly formats. — 14 services. JSON: catalog/web-search.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | Brave Search API
⭐⭐⭐⭐⭐ 4.5/5 · 2 reviews
| Lets an agent query Brave's independent web/image/video/news search index and get cited, LLM-ready results. | API key | ✅ | 🆓 $5 free monthly credits (~1,000 queries on Search plan); credit card required at signup as anti-fraud measure | docs | | Exa
⭐⭐⭐⭐⭐ 5.0/5 · 1 review
| Lets an agent run neural or keyword web search, retrieve page contents, and find similar links via Exa's API. | API key | ✅ | 🆓 free tier: $10 free credits/month (~1,400 searches), no payment method required | docs | | Jina AI Search / Reader | Search the web or convert any URL into clean LLM-ready markdown via simple HTTP GET requests. | API key | ✅ | 🆓 No key needed for Reader only: 20 RPM (Search is blocked without a key); free API key gives Reader 500 RPM / Search 100 RPM plus 10M free tokens one-time on signup | docs | | Kagi Search API
⭐⭐⭐⭐⭐ 5.0/5 · 1 review
| Run programmatic, ad-free premium web/news/image/video searches and extract page markdown via a paid REST API. | API key | ✅ | no free tier: pay-per-use, $12 per 1,000 search requests, invoiced monthly or at $100 usage, whichever first | docs | | Linkup
| Lets an agent search, fetch pages, or run deep multi-source research via Linkup's Search/Fetch/Research API endpoints. | API key | ✅ | 🆓 $20 free credits/month for new accounts signing up with a professional email | docs | | Mojeek Search API
⭐⭐⭐⭐⭐ 5.0/5 · 1 review | Query Mojeek's independent web index for titles, URLs and snippets in JSON or XML, with country/language boosting. | API key | — | limited-query free trial available on request; paid plans from £2 CPM (Startup, 5 req/s, 100k/day cap) | docs | | Parallel Web Systems Search API
| Lets an agent run Parallel's low-latency Search API for web research, content extraction, and entity discovery. | API key | ✅ | 🆓 free: 5,000 requests/month across APIs, plus up to $80 signup credit and $5/month free credits | docs | | Perplexity Sonar / Search API
| Lets an agent call Perplexity's Search API or MCP tools (search/ask/research/reason) for real-time grounded web answers. | API key / OAuth | ✅ | Paid only: no confirmed free tier; pay-as-you-go, Search API billed at $5 per 1,000 requests ($1 per 1,000 for the fast search variant) | docs | | SearchApi.io | Fetch structured JSON results from Google, Bing, YouTube, Amazon, TikTok and 50+ other search engines via one REST API. | API key | ✅ | Trial: 100 free requests one-time on signup, no credit card required; then Developer plan $40/mo for 10,000 searches | docs | | SearXNG (self-hosted JSON API)
| Query a self-hosted SearXNG metasearch instance's JSON API to aggregate results from many search engines at once. | none | ◐ | 🆓 free, no key (self-hosted; you run and pay for the instance yourself) | docs | | SerpApi
| Lets an agent scrape structured JSON results from Google and 20+ other search engines via SerpApi's REST API. | API key | ✅ | 🆓 free plan: 250 searches/month, 50 requests/hour throughput | docs | | Serper
| Lets an agent fetch fast, low-cost Google search results (web, images, news, maps, shopping) via Serper's REST API. | API key | ◐ | Trial: 2,500 free queries one-time on signup, no credit card required; then prepaid query packages | docs | | Tavily
| Lets an agent call Tavily's search API or MCP server to run web searches and get AI-ready summarized results. | API key | ✅ | 🆓 free tier: 1,000 API credits/month, no credit card required | docs | | You.com API
⭐⭐⭐⭐⭐ 5.0/5 · 1 review | Lets an agent call You.com's Search/Answer/Research API or MCP server for LLM-ready web search and grounded answers. | API key | ✅ | 🆓 Free: 100 queries/day with no API key or sign-up through the MCP free profile (search and discover only); new API-key accounts also get $100 in one-time credit | docs |

Web scraping and browser automation

Crawl, scrape and convert pages to Markdown/JSON, or drive a remote headless browser (clicks, forms, logins). — 19 services. JSON: catalog/web-scraping-browser.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | Anchor Browser
⭐⭐⭐⭐⭐ 5.0/5 · 1 review
| Provision authenticated cloud browser sessions and turn any website into callable MCP tools for agents. | API key | ✅ | 🆓 $5 free credits/mo, no card required | docs | | Apify
⭐⭐⭐⭐⭐ 4.8/5 · 1,800 reviews
| Run web scraping/automation 'Actors' from a marketplace of thousands, and manage datasets, via REST API or MCP server. | API key / OAuth | ✅ | 🆓 free plan: $5/mo platform usage credit, no card required | docs | | Bright Data
⭐⭐⭐⭐⭐ 4.5/5 · 1 review
| Access Web Unlocker, SERP API, Scraping Browser, and structured datasets via REST API or MCP to pull web data at scale. | API key | ✅ | 🆓 Free tier: 5,000 requests/month via the MCP server (renews on the 1st, no card required); other products pay-as-you-go | docs | | Browse AI API | Trigger pre-built or custom 'robots' to extract and monitor web data via REST API, returning structured JSON. | API key | — | 🆓 free forever plan: 50 credits/mo, no card required | docs | | Browser Use Cloud API
⭐⭐⭐⭐⭐ 5.0/5 · 1 review
| Launch cloud browser sessions and run AI browser-automation agent tasks via REST API or Python/TypeScript SDK. | API key | ✅ | $15 one-time signup credit for new accounts (Google/GitHub/Microsoft); paid usage afterward | docs | | Browserbase (+ Stagehand)
⭐⭐⭐ 3.0/5 · 2 reviews
| Run and control cloud headless browsers programmatically, with Stagehand adding natural-language page actions. | API key | ✅ | 🆓 Free tier: 1 browser hour/month, 3 concurrent browsers, 15 min/session, no card required | docs | | CurlShot | Lets an agent capture a public web page in a real browser as PNG, JPEG, WebP or PDF (full page, device presets, dark mode, ad blocking) or record it scrolling as MP4, WebM or GIF. | API key | ✅ | 🆓 free plan: 100 screenshots/month, no card required; paid from $19/mo (3,000 screenshots) | docs | | Diffbot
| Automatically extract structured data (articles, products, people) from any URL via REST API, no custom parsing rules needed. | API key | — | 🆓 free plan: 10,000 credits/mo, no card required (5 req/min limit) | docs | | Firecrawl
⭐⭐⭐⭐⭐ 5.0/5 · 1 review
| Scrape, crawl, and extract structured data from any website via a single REST API call. | API key | ✅ | 🆓 free tier: 1,000 credits/mo, no card required | docs | | Hyperbrowser
| Spin up cloud browsers and call scrape, crawl, and structured-extract endpoints via REST API or MCP server. | API key | ✅ | 🆓 Free: Free plan with 5,000 credits (1 credit = $0.001), 1 concurrent browser, 7-day data retention; no credit card required | docs | | Oxylabs
⭐⭐⭐⭐ 4.2/5 · 1,216 reviews
| Fetch web pages, search-engine results, and e-commerce data at scale via REST API with built-in proxy/unblocking infrastructure. | API key | ✅ | Trial: Web Scraper API free trial with up to 2,000 results one-time, no card required | docs | | Playwright MCP (Microsoft)
| Official Microsoft MCP server giving agents structured browser control (click, type, navigate) via Playwright's accessibility tree. | none | ✅ | 🆓 free, open source, no key | docs | | ScrapeGraphAI API
| Use AI-driven prompts to scrape and extract structured data from webpages via REST API or Python/JS SDK. | API key | ✅ | Trial: 500 API credits one-time on the Free plan (10 requests/min), no card required | docs | | ScraperAPI | Scrape any webpage with automatic proxy rotation, CAPTCHA handling, and JS rendering via a single REST API call. | API key | ✅ | 🆓 Free: free plan with 1,000 API credits per month (max 5 concurrent connections); new accounts start with a 7-day trial of 5,000 one-time credits, no card required | docs | | Scrapfly
| Scrape webpages, run cloud browsers, and capture screenshots via REST API or hosted MCP server with anti-bot bypass. | API key / OAuth | ✅ | 🆓 1,000 free credits/mo, no card required, no time limit | docs | | ScrapingBee
| Scrape any webpage with JS rendering, proxy rotation, and screenshot capture via a single REST API call. | API key | ✅ | Trial: 1,000 free API credits one-time on signup, no card required; then Hobby plan $19/mo for 75,000 credits | docs | | Spider.cloud
| Crawl and scrape websites at scale, returning JSON/XML/CSV, via REST API, CLI, or MCP server. | API key | ✅ | 🆓 Free: keyless /scrape endpoint, rate-limited (quota not published); other endpoints return 402 without a key | docs | | Steel
| Create managed cloud browser sessions with stealth proxies and CAPTCHA solving, controllable via REST API or Playwright/Puppeteer. | API key | ✅ | Trial: Launch plan is $0 + usage with $30 one-time usage credits valid 90 days (10 concurrent sessions, 60 requests/min); no Hobby plan | docs | | Zyte API
| Fetch and auto-extract web pages (HTML, browser rendering, product/article data) via one HTTP API with ban avoidance. | API key | — | Trial: $5 free credit one-time on signup, valid 30 days, no subscription needed; then pay-as-you-go or a monthly commitment | docs |

Knowledge and research data

Encyclopedias, academic papers, news, computational knowledge and up-to-date library documentation. — 19 services. JSON: catalog/knowledge-research.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | arXiv API
| Search arXiv preprints by keyword, author, category or ID and retrieve metadata, abstracts and PDF links. | none | ◐ | 🆓 free, no key | docs | | Congress.gov API
| Lets an agent look up U.S. bills, amendments, votes, members, committees, nominations and Congressional Record data from the Library of Congress. | API key | ◐ | 🆓 Free: government API, key issued instantly by email; 5,000 requests/hour. | docs | | Context7 (library docs for agents)
| Fetch up-to-date, version-specific library documentation and code examples into a coding agent's context via MCP or REST. | API key | ✅ | 🆓 Free: 1,000 API calls per month with a free API key (low limits without key); Pro $10/seat/month | docs | | Court Rules | Lets an agent read U.S. federal and local court rules, judge standing orders, court holidays and filing deadlines, and compute a filing deadline for any federal district. | API key | ✅ | 🆓 free tier: Developer plan at $0/month with full API access, rate limited to 10 requests/minute | docs | | Crossref REST API
| Look up and search scholarly metadata such as DOIs, references, authors, funders and licenses across Crossref-registered works. | none | ◐ | 🆓 free, no key | docs | | DC Hub | Lets an agent check where data centers can get grid power, using the Data Center Power Index (DCPI) daily score across 300+ markets, plus grid, interconnection-queue, fiber and site data. | API key | ✅ | 🆓 free tier: keyless previews; a free self-serve key adds 2 full answers per tool per day, and 50 calls/day once an email is added | docs | | GDELT API
| Full-text search global news in about 65 languages and analyze coverage volume, tone and geography in near real time. | none | ◐ | 🆓 free, no key | docs | | Gitingest API
| Lets an agent turn any public Git repository into a single text digest (summary, directory tree and file contents) sized for an LLM prompt. | none | ◐ | 🆓 No key needed: free public service; hosted API limited to 10 requests/minute per endpoint (the web UI also has rate limiting and CAPTCHA protection). | docs | | Hacker News API
| Read Hacker News stories, comments, jobs, polls, user profiles and front-page rankings as real-time JSON. | none | ◐ | 🆓 free, no key | docs | | Internet Archive Open Library API
| Lets an agent search books, authors and subjects, fetch work/edition data by ISBN or OLID, search inside book texts and get cover images. | none | ◐ | 🆓 No key; free and open: 1 request/second anonymous, 3 requests/second with an identifying User-Agent. | docs | | New York Times APIs
| Lets an agent search NYT articles back to 1851, read top stories, most-popular lists, the Times Wire feed and bestseller lists. | API key | ◐ | 🆓 Free: all public APIs are free; 500 requests/day and 5 requests/minute per API. | docs | | NewsAPI
| Search and retrieve current and historical news articles and top headlines from thousands of sources worldwide. | API key | ◐ | 🆓 free Developer plan: 100 req/day, dev/test only, 24h article delay | docs | | OpenAlex API
| Query an open catalog of scholarly works, authors, institutions, sources and topics, including citation data, via REST. | API key | ◐ | 🆓 free: $1 of API usage/day without payment method; free key raises daily budget 10x | docs | | PubMed E-utilities (NCBI)
| Search, fetch, summarize and cross-link biomedical literature records from PubMed, PMC and other Entrez databases. | none | ◐ | 🆓 free; 3 req/s without key, 10 req/s with free NCBI API key | docs | | Semantic Scholar API
| Search papers, authors and citation graphs, and get paper recommendations from Semantic Scholar's academic corpus. | API key | ◐ | 🆓 free; no key (shared, throttled pool) or free API key on request | docs | | SemanticHub | Lets an agent set up monitoring of news sources, read clustered articles and generated texts, and manage goals and workflows in SemanticHub. | API key / OAuth | ✅ | 🆓 free forever, no card: 1 goal, 100 sources to watch, 5 workflow nodes, articles kept 7 days; paid plans from $29/month | docs | | Wikidata
| Query the Wikidata knowledge graph of entities, facts and relations via SPARQL, the REST API or MCP. | none | ✅ | 🆓 free, no key | docs | | Wikipedia / Wikimedia API
| Search, read and summarize Wikipedia and other Wikimedia content and metadata via REST and Action APIs. | none | ◐ | 🆓 free, no key (rate-limited) | docs | | Wolfram\|Alpha API
| Get computed answers, structured data and step-by-step results for math, science and factual queries. | API key | ✅ | 🆓 Free: non-commercial developer AppID with up to 2,000 calls/month; paid for commercial use | docs |

Image generation and editing

Text-to-image, image editing, inpainting, upscaling and background removal. — 10 services. JSON: catalog/image-generation.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | Adobe Firefly Services API
| Generate and edit images and manage creative assets programmatically via Adobe's Firefly REST APIs. | OAuth 2.0 | ◐ | check pricing; requires Adobe Developer Console project and Firefly Services entitlement | docs | | Black Forest Labs FLUX API | Generate, edit, and vary FLUX model images from text prompts via REST or the official OAuth MCP server. | API key | ✅ | paid only, no free tier (FLUX Schnell weights are open for self-hosting) | docs | | Freepik API | Generate and edit images, and generate video, music and sound effects via REST API, plus access the Freepik stock asset library. | API key | ✅ | 🆓 free tier: ~5 EUR of free API credits, then pay-as-you-go | docs | | Google Gemini / Imagen image API
| Generate and multi-turn edit images from text via REST (Nano Banana/Imagen models), up to 4K with reference-image support. | API key | — | Paid only: pricing page lists Free Tier 'Not available' for all Gemini image models (Nano Banana family); usage-billed | docs | | Ideogram API | Generate, edit, remix, upscale, and describe images via REST or an official OAuth MCP server, strong at in-image text. | API key | ✅ | Paid only: no free API credits (web app has 10 slow credits/week); API is pay-per-image from prepaid credit (min one-time purchase $1, min auto top-up target $10) | docs | | Leonardo.Ai API
⭐⭐⭐⭐⭐ 5.0/5 · 1 review
| Generate images and videos from text via REST or the official MCP server, with model selection and job status polling. | API key | ✅ | Paid only: Pay-As-You-Go API credit (USD balance) via manual or auto top-ups; API access is separate from free/web app plans | docs | | OpenAI Images API (gpt-image)
⭐⭐⭐⭐⭐ 5.0/5 · 3 reviews
| Generate, edit, and iteratively refine images from text prompts via REST, with mask-based inpainting and streaming previews. | API key | ◐ | paid only; no free image credits, usage-based billing | docs | | Recraft API | Generate, edit, upscale, and vectorize images via REST API using Recraft's proprietary models. | API key | ✅ | paid only; pay-per-image (from $0.007/image on V4.1 Flash), no confirmed free credits | docs | | remove.bg API | Remove image backgrounds programmatically via a simple REST API with JSON or multipart uploads. | API key | — | 🆓 Free: first 50 API calls per month, then paid credits | docs | | Stability AI Platform API
| Generate, upscale, and edit images via REST (Stable Image Ultra/Core/SD3 models) using simple credit-based billing. | API key | ◐ | 25 free credits on signup, then pay-as-you-go | docs |

Video generation and editing

Text/image-to-video models, talking avatars, programmatic video rendering and video hosting. — 14 services. JSON: catalog/video-generation.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | Akool API | Generate face-swap, talking avatar, and video-translation content programmatically via REST API. | API key | — | Paid only for API: API access starts at the Pro Max plan; the Free plan is web-app only with full-screen watermark | docs | | Creatomate API
| Programmatically generate and render videos/images from templates via REST API. | API key | ✅ | Trial: full-featured trial with 50 credits one-time on signup, no credit card required; then Essential plan with 2,000 credits/mo | docs | | D-ID API | Animate photos into talking-head videos with lip-sync from text or audio via REST API. | API key | ✅ | Trial: 14 days with 3 minutes of video credits, then paid plans only (API price per minute not published in machine-readable form) | docs | | Google Veo (Gemini API / Vertex AI)
| Generate video from text or image prompts via Gemini API (api key) or Vertex AI (cloud IAM), incl. Veo 3.1 scene extension. | API key / OAuth | ✅ | no free tier for video; Veo generation requires a paid Gemini API / Vertex AI billing account | docs | | HeyGen API
⭐⭐ 2.0/5 · 1 review | Create AI avatar/talking-head videos from text or audio, manage avatars and voices, via REST API. | API key / OAuth | ✅ | no free API credits since Feb 2026; pay-as-you-go from $5, $0.50-$0.99/credit. Free plan (3 videos/mo) exists but is for the web app, not standalone API. | docs | | Klap API | Automatically turn long videos into short clips with captions and reframing via REST API. | API key | — | Paid only; usage-based, billed monthly per operation (Generate Short $0.32, Video Input $0.44, Export $0.48); no free API credits stated | docs | | Kling AI API
| Generate text-to-video, image-to-video, lip-sync and video effects via REST API with a Bearer API key. | API key | ◐ | Paid only; prepaid credit packages from $0.14/unit, e.g. 5,000 units/$700, 180-day validity; a Trial Resource Package for integration testing is offered | docs | | Luma AI Dream Machine API
| Generate and extend AI videos from text or start/end keyframe images via async REST API (Ray 3.2). | API key | ✅ | Paid only; pay per video, e.g. Ray 3.2 5s text/image-to-video $0.15 (540p) / $0.30 (720p) / $1.20 (1080p), $5,000/mo cap on default Build tier | docs | | MiniMax Hailuo API
| Async text-to-video, image-to-video and subject-reference video generation via REST API, up to 1080p. | API key | ✅ | new accounts get 50 signup credits (~1 short clip); 5s video costs ~45-70 credits, 1000 credits=$1 | docs | | PixVerse API
| Generate text-to-video, image-to-video, transition and fusion clips (360p-1080p) via REST API. | API key | ✅ | Paid only; prepaid credits from $10, $1 = 5 videos (v6, 720p, 5s, no audio) | docs | | Runway API
| Generate and edit images/video (Gen-4.5) via async task-based REST API: submit, poll, download. | API key | ✅ | no free tier; $10 minimum credit top-up, $0.01/credit | docs | | Shotstack API | Compose Edit JSON timelines to programmatically render, edit, and template videos, images and audio. | API key | ✅ | Trial: 10 free credits one-time (valid 30 days), then pay-as-you-go or subscription; stage sandbox (https://api.shotstack.io/edit/stage) for development, v1 production without watermarks | docs | | Synthesia API
⭐⭐⭐⭐⭐ 5.0/5 · 1 review | Generate AI avatar talking-head videos from text scripts via REST API; supports custom avatars and voices. | API key | ✅ | Paid only; API access requires the Creator plan or above | docs | | Tavus API
| Create AI video replicas and real-time conversational video agents (CVI) via REST API. | API key | ✅ | 🆓 Free tier: Free plan with 25 min of conversational video and 5 min of video generation per month, full API access, 25 stock replicas; Starter $59/mo | docs |

Speech and audio

Text-to-speech, speech-to-text, voice cloning, dubbing and audio intelligence. — 13 services. JSON: catalog/audio-speech.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | Amazon Polly / Amazon Transcribe (AWS)
| Convert text to lifelike speech (Polly) and transcribe audio with speaker diarization (Transcribe) via AWS API. | cloud IAM | ✅ | 🆓 Free tier: Polly 5M chars/mo standard (neural 1M, generative 100K chars/mo for first 12 months), Transcribe 60 min/mo (12 months); new AWS accounts since 2025-07-15 get up to $200 Free Tier credits | docs | | AssemblyAI API
| Transcribe recorded or streaming audio with speaker diarization, sentiment analysis and LLM-based audio insights via REST. | API key | — | Trial: $50 in free credits one-time on signup, no card required, credits do not expire (LLM Gateway not included); then pay-as-you-go | docs | | Azure AI Speech
| Convert text to speech, transcribe speech to text and translate speech via REST or Speech SDK. | cloud IAM | ✅ | 🆓 Free tier (F0): 5 audio hrs/mo STT, 0.5M chars/mo neural TTS; batch transcription not available on F0 | docs | | Cartesia API
| Generate low-latency real-time text-to-speech, transcribe speech and clone voices via REST/WebSocket API. | API key | ✅ | 🆓 Free tier: 20,000 credits/mo; no commercial-use license and no voice cloning | docs | | Deepgram API
| Transcribe batch or streaming audio with diarization, synthesize speech, and run real-time voice agents via REST/WebSocket. | API key | ✅ | Trial: $200 in free credit one-time on signup, no credit card required; then pay-as-you-go | docs | | ElevenLabs API
⭐⭐⭐⭐ 4.0/5 · 4 reviews
| Generate, clone and stream text-to-speech voices and transcribe audio via REST/WebSocket API. | API key | ✅ | 🆓 Free: limited monthly credits; non-commercial use with attribution only, no voice cloning | docs | | Google Cloud Text-to-Speech / Speech-to-Text
| Synthesize lifelike speech from text and transcribe audio to text via REST/gRPC using GCP credentials. | cloud IAM | ✅ | 🆓 Free tier: TTS 4M chars/mo Standard and WaveNet, 1M chars/mo Neural2, Chirp 3 HD and Studio; STT 60 min/mo | docs | | Hume AI API
| Generate expressive text-to-speech and run real-time empathic voice conversations (EVI) via REST/WebSocket. | API key | ✅ | 🆓 Free tier: 10,000 TTS chars/mo + 5 EVI min/mo; new accounts also get $20 in credits | docs | | Murf AI API
⭐⭐⭐⭐⭐ 5.0/5 · 7 reviews
| Generate AI voiceovers, clone voices and dub audio in 35+ languages via REST API. | API key | ✅ | Trial: 100,000 characters one-time on the free API plan, no time limit | docs | | OpenAI Audio API (TTS / transcription)
⭐⭐⭐⭐⭐ 5.0/5 · 3 reviews
| Synthesize speech with TTS models and transcribe or translate audio with Whisper/GPT-4o transcribe via REST. | API key | — | paid only (pay-per-use) | docs | | Resemble AI API
⭐⭐ 1.7/5 · 3 reviews
| Synthesize speech, clone voices, convert speech-to-speech and detect deepfake audio via REST API. | API key | — | Paid only; Flex plan is $0/mo base with pay-as-you-go credits, no free usage allowance stated | docs | | Rev AI API
| Submit audio for asynchronous or streaming speech-to-text transcription, plus sentiment and topic extraction, via REST. | API key | — | trial credits (about 5 hours of ASR) | docs | | Speechmatics API
| Transcribe audio in batch or real time with speaker diarization across many languages via REST/WebSocket. | API key | ◐ | Trial: one-time $100 credit grant, no payment card required | docs |

Music generation

Generate songs, instrumentals, loops and sound effects from prompts. — 6 services. JSON: catalog/music-generation.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | Beatoven.ai API
⭐⭐⭐⭐ 3.8/5 · 4 reviews | Generate royalty-cleared background music and sound effects from text prompts via REST API (Maestro). | API key | — | check pricing | docs | | ElevenLabs Music API
⭐⭐⭐⭐ 4.0/5 · 4 reviews
| Generate original music tracks from text prompts or detailed composition plans via REST API, with commercial licensing. | API key | ✅ | 🆓 Free tier: 10,000 credits per month shared with TTS (music included, no commercial use of music on Free; Starter $6/mo or higher needed) | docs | | Loudly API
⭐ 1.0/5 · 1 review | Generate, remix, stem-split, and master music tracks programmatically via REST API. | API key | — | Trial: free track allowance on signup with the API key from the developer portal; then volume-based pricing (Startup/SME/Corporate) or pay-as-you-go | docs | | Mubert API | Generate streaming or file-based background music from text/image prompts via REST/WebRTC API, 15s-25min tracks. | API key | — | paid only; plans start at $49/mo (100 generations/mo), no free tier | docs | | Soundraw API
⭐ 1.0/5 · 1 review | Generate royalty-free background music tracks by mood, genre, and duration via REST API for embedding in apps. | API key | — | Trial: one-time 2-week free API trial with no commitment; then Starter $29.99/mo for 100 songs with a 6-month minimum commitment | docs | | Stable Audio API (Stability AI)
| Generate music and sound effects from text prompts via REST API (Stable Audio 2.5, or Stable Audio 3.0 for tracks up to 6 minutes). | API key | — | shares Stability AI platform credits; 25 free credits on signup, then pay-as-you-go | docs |

3D generation and assets

Text/image-to-3D mesh generation, texturing and 3D asset libraries. — 6 services. JSON: catalog/3d-generation.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | Hyper3D Rodin API | Generate 3D meshes from text or images (sketch/regular/detail quality tiers) via an async REST job API. | API key | — | Paid only: API access requires the Business plan ($120/mo, $96/mo billed annually) or Enterprise; direct credits $1.5 each | docs | | Meshy API
| Generate, retexture, rig, and animate 3D models from text or images via REST API or official MCP server. | API key | ✅ | Paid only: creating API keys requires a paid plan (Pro $20/mo+); Free accounts get only a built-in test key for the Playground (free web plan 100 credits/mo) | docs | | Sketchfab Data API
| Search, download, and upload 3D models on Sketchfab programmatically via the REST Data API v3. | API key / OAuth | ◐ | 🆓 Free: no key needed for search and model listing (GET /v3/search, /v3/models); downloads (/v3/models/{uid}/download) need a free account token | docs | | Stability AI 3D (Stable Fast 3D / SPAR3D) API | Convert a single 2D image into a textured 3D mesh (GLB) via the v2beta/3d REST endpoints. | API key | — | Trial: 25 free credits on signup (1 credit = $0.01), then pay-as-you-go | docs | | Tencent Hunyuan3D API | Generate textured 3D meshes (GLB, PBR) from text, images, or sketches via Tencent Cloud's Hunyuan 3D API. | cloud IAM | — | Trial: 200 free credits one-time on first activation (valid 1 year); then postpaid $0.02/credit, Professional generation 25 credits (~$0.50), Express 15 | docs | | Tripo API
| Generate textured 3D meshes from text or images via REST API, with an official MCP server for agents. | API key | ✅ | Trial: starter free credits (Tripo docs: 300 free credits; amount varies by signup path), then pay-as-you-go at $0.01/credit | docs |

Architecture, CAD and BIM

Building information models, CAD geometry, construction management and GIS platforms with programmatic access. — 8 services. JSON: catalog/architecture-cad-bim.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | Autodesk Platform Services (APS)
| Upload, translate, view and automate CAD/BIM files (Model Derivative, Data Management, Design Automation) via REST APIs. | OAuth 2.0 | ✅ | 🆓 Free tier: limited usage of rated APIs (Automation, Model Derivative, Flow Graph Engine, Reality Capture) per month, renews monthly; Pay as You Go beyond that needs a card or PayPal | docs | | Bentley iTwin Platform APIs
| Create, manage and query digital twins, iModels and reality/reporting data for infrastructure projects via REST APIs. | OAuth 2.0 | — | 🆓 Free tier: Community plan with 100 credits/month, 10 GB cloud data, 100 GB reality data; non-commercial, non-production use only; no expiry | docs | | Onshape REST API
| Create, read and modify Onshape CAD documents, parts, assemblies and drawings programmatically via REST API. | API key / OAuth | ✅ | 🆓 free tier (public documents only); private documents need a paid plan | docs | | Procore API
⭐⭐⭐⭐⭐ 5.0/5 · 2 reviews
| Read and write construction project data - RFIs, submittals, drawings, budgets, schedules - via REST API. | OAuth 2.0 | ✅ | 🆓 free developer sandbox; production requires customer's paid Procore plan | docs | | Rhino.Compute (McNeel)
| Run Rhino/Grasshopper geometry operations headlessly via a stateless REST API you deploy yourself. | API key | — | Paid only: self-hosted, requires a Rhino license; core-hour billing at $0.10 per core per hour of Rhino uptime on Windows Server, no free allowance | docs | | Speckle API
| Send, receive and query 3D/BIM model data across CAD tools (Revit, Rhino, Grasshopper, Tekla) via GraphQL API and SDKs. | API key / OAuth | ◐ | 🆓 free Explore plan (1 project, 3 users), unlimited API calls | docs | | Trimble Connect API
| Manage Trimble Connect projects, files, BIM models, issues/topics and metadata via REST APIs (Core, Model, Organizer). | OAuth 2.0 | — | check pricing | docs | | Zoo Text-to-CAD API (KittyCAD)
| Convert CAD files and run modeling operations via REST API; text-to-CAD generation runs through the WebSocket copilot and the MCP server. | API key | ✅ | start free trial credits, then usage-based pay-as-you-go | docs |

Diagrams and software architecture

Render or edit diagrams (Mermaid, PlantUML, C4), whiteboards and architecture models. — 8 services. JSON: catalog/diagrams-software-architecture.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | Eraser API (DiagramGPT) | Generate diagrams from text prompts (DiagramGPT) and manage Eraser files programmatically via REST API. | API key | ✅ | paid only - API tokens require an active paid team plan | docs | | IcePanel API
⭐⭐⭐⭐⭐ 5.0/5 · 1 review | Programmatically create, read, import, and export C4-style architecture landscapes and models via REST API. | API key | ✅ | 🆓 free tier: 10,000 read requests/mo, 1,000 write requests/mo, 5 import/export requests/mo | docs | | Kroki | Render 25+ diagram-as-code formats (PlantUML, Mermaid, C4, GraphViz, BPMN, etc.) from text via a free HTTP GET/POST API. | none | — | 🆓 free, no key; public hosted instance at kroki.io sponsored by Exoscale (no SLA) | docs | | Lucid (Lucidchart) REST API
| Create, read, search, and manage Lucidchart documents and folders programmatically via REST API. | API key / OAuth | ✅ | check pricing | docs | | Mermaid Chart API
| Validate, render, and save Mermaid diagrams via Mermaid Chart's official MCP server using an account API token. | API key | ✅ | 🆓 unauthenticated MCP validate/render tools are free; saving to a Mermaid Chart account needs a token, check pricing for limits | docs | | Miro REST API
⭐⭐⭐⭐⭐ 4.7/5 · 121 reviews
| Create/read boards and items via REST API, or use Miro's official MCP server to search, build, and summarize boards. | OAuth 2.0 | ✅ | 🆓 Free tier: up to 3 editable team boards; MCP on all plans, capped per day at 100 tool calls on Free (Starter 500, Business 2,000, Enterprise 10,000) | docs | | Napkin AI API
⭐⭐⭐⭐⭐ 5.0/5 · 1 review | Generate diagrams, flowcharts, mind maps, and charts from text via REST API, exporting to SVG, PNG, or PPT. | API key | — | 🆓 included on every plan; any account can create a token and call the API, limited by credits | docs | | PlantUML Server API
| Render UML and architecture-as-code diagrams to PNG/SVG/ASCII via a free public HTTP GET API using encoded diagram text. | none | — | 🆓 free, no key; public hosted server at plantuml.com/plantuml | docs |

Design and UI

Read and write design files, generate branded graphics and publish websites. — 6 services. JSON: catalog/design-ui.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | Canva Connect API
| Programmatically create, autofill, and export Canva designs, and manage assets and comments via a REST API. | OAuth 2.0 | ✅ | check pricing (free to build/test; public apps require Canva review before production use) | docs | | Figma REST API / Dev Mode MCP
⭐⭐⭐⭐⭐ 4.7/5 · 15 reviews
| Read and write Figma file/comment/component data via REST, and feed live design context to coding agents via the official Dev Mode MCP server. | API key / OAuth | ✅ | 🆓 free: personal access tokens work on free plan, rate-limited per seat/plan tier; MCP free during beta | docs | | Framer
⭐⭐⭐⭐ 4.0/5 · 1 review
| Automate publishing of Framer sites programmatically (get project info, publish previews, promote to production) via a Node SDK. | API key | — | 🆓 Free: Server API is free while in beta; Framer plans per-use pricing with a monthly free allowance later | docs | | Penpot API
⭐⭐⭐⭐⭐ 5.0/5 · 1 review | Read, create, and modify Penpot design files, comments, and webhooks via a token-authenticated RPC/REST API, or via the official MCP server. | API key | ✅ | 🆓 free tier: free cloud account (design.penpot.app) plus free, open-source self-hosting | docs | | v0 Platform API (Vercel)
| Generate full UI/frontend code from natural-language prompts, iterate via chat, and deploy the result directly to Vercel via REST API. | API key | ✅ | 🆓 Free tier: v0 Free plan includes $5 of credits per month (7 messages/day); Platform API use on Free not confirmed, credits also included on Premium/Team plans | docs | | Webflow Data API
⭐⭐⭐ 3.3/5 · 3 reviews
| Create/update CMS collections, items, and pages, and publish Webflow sites programmatically via REST API or the official MCP server. | API key / OAuth | ✅ | check pricing (API access itself is free with a token; some CMS/publish actions require the site to be on a paid Webflow plan) | docs |

Documents, OCR and presentations

Parse PDFs and scans, convert file formats, generate slides and collect e-signatures. — 14 services. JSON: catalog/presentations-documents.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | Adobe PDF Services API
| Programmatically create, convert, combine, compress, OCR, and extract data from PDF documents. | OAuth 2.0 | — | 🆓 free tier: 500 document transactions/month, no credit card required | docs | | AWS Textract
| Detect and extract text, forms, tables, and data from scanned documents and images via API calls. | cloud IAM | ✅ | Trial: new AWS customers get 3 months free, per month 1,000 pages DetectDocumentText, 100 pages AnalyzeDocument forms/tables/layout/queries, 100 AnalyzeExpense/AnalyzeID, 2,000 pages AnalyzeLending; card required | docs | | Azure AI Document Intelligence
| Analyze forms, invoices, receipts, and scanned documents to extract structured JSON via REST API. | cloud IAM | — | 🆓 Free tier: F0 pricing tier, 500 pages/month; analyzes only the first 2 pages per document, 4 MB max file, 1 TPS | docs | | CloudConvert API
⭐⭐⭐⭐⭐ 5.0/5 · 1 review
| Convert, compress, merge, watermark, and OCR files across 200+ formats via REST API or MCP. | API key / OAuth | ✅ | 🆓 Free: 10 conversion credits/day including all API features, no credit card required; paid credit packages beyond that; free Sandbox API for unlimited test jobs without consuming credits | docs | | DocuSign eSignature API
⭐⭐⭐⭐ 4.3/5 · 43 reviews
| Send, sign, track, and manage electronic signature envelopes and agreement workflows via REST API. | OAuth 2.0 | ✅ | 🆓 free developer/demo sandbox account (account-d.docusign.com) with unlimited test envelopes; production use requires a paid DocuSign plan | docs | | Gamma API
| Generate, poll, and export AI-made presentations, documents, or social posts as PDF/PPTX via REST API. | API key / OAuth | ✅ | Paid only for API keys (Pro, Ultra, Teams or Business plan); the Gamma MCP server/connectors work on all plans including Free, with generations consuming credits | docs | | Google Document AI
| Extract text, tables, and structured data from documents like invoices, forms, and IDs via REST API. | cloud IAM | — | 🆓 Free tier: first 1,000 pages/month free for Enterprise Document OCR only (then $1.50/1,000); Form Parser and custom extractor $30/1,000 pages with no free band | docs | | Google Slides / Docs API
| Read and programmatically edit Google Slides presentations (slides, shapes, text, tables) via REST API or MCP. | OAuth 2.0 | ✅ | 🆓 free, no key (standard Google API usage quotas apply; requires GCP project + OAuth consent) | docs | | LlamaParse (LlamaCloud)
| Parse, classify, extract, and split complex documents (tables, forms, charts) into LLM-ready structured data via API. | API key | ✅ | 🆓 Free tier: Free plan with 10K credits/month; beyond that credit-based at $1.25/1,000 credits (1-45+ credits/page depending on tier); 48h parse cache is free to re-query | docs | | Mistral OCR API
| Extract text, tables, and layout structure from PDFs and images as structured Markdown/JSON via REST API. | API key | ◐ | 🆓 Free tier: Free plan includes $10/month in API credits; then $4/1,000 pages (OCR), $5/1,000 pages (Document AI); 50% off via Batch API | docs | | PDF.co API
| Convert, merge, split, edit, fill forms, OCR, and extract data from PDFs via REST API. | API key | ✅ | trial credits: 10,000 credits for 1 month, no credit card required | docs | | Reducto API
| Parse, extract, split, edit, and classify complex documents into structured JSON/Markdown via REST API or SDKs. | API key | ✅ | Trial: $150 in free credits (15,000 credits) one-time for new Standard accounts; then standard rates; Startup Program gives extra credits to qualifying teams | docs | | SlideSpeak API
⭐ 1.0/5 · 1 review
| Generate, edit, and download PowerPoint/PDF presentations from text, documents, or outlines via REST API. | API key | ✅ | Trial: free API trial, no credit card required; then API plans from $49/month (1,000 credits) | docs | | Unstructured API
| Partition and extract structured elements (text, tables, layout) from PDFs, docs, and images for RAG pipelines via API. | API key | ✅ | Trial: 10,000 free pages one-time on signup, no credit card; then pay-as-you-go at $0.015/page | docs |

Translation and language

Machine translation, grammar and style checking. — 6 services. JSON: catalog/translation-language.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | Amazon Translate
⭐⭐⭐⭐⭐ 5.0/5 · 1 review
| Translate text and documents in real time or batch across 75+ languages via the AWS SDK/API. | cloud IAM | ✅ | 🆓 free tier: 2M characters/month for 12 months (new AWS accounts) | docs | | Azure AI Translator
| Translate text, detect language, and transliterate across 100+ languages via REST API within Azure AI Services. | API key | ◐ | 🆓 free tier (F0): 2,000,000 characters/month | docs | | DeepL API
⭐⭐⭐⭐ 4.0/5 · 1 review
| Translate and rephrase text or documents between 30+ languages via REST API, SDKs, or an official MCP server. | API key | ✅ | 🆓 Free: API Developer plan ('Test out the API for free', EUR 0 base price, 1,000,000 characters/month in the pricing data); legacy API Free keys (:fx) use api-free.deepl.com | docs | | Google Cloud Translation
| Translate text/documents and detect language across 100+ languages via REST/gRPC API within Google Cloud. | cloud IAM | ◐ | 🆓 free tier: 500,000 characters/month (permanent, not a trial) | docs | | LanguageTool API
⭐⭐⭐⭐⭐ 5.0/5 · 1 review
| Check grammar, style, and spelling in 30+ languages via a public HTTP API, with an optional Premium key for higher limits. | API key | ◐ | 🆓 Free: no key needed on public endpoint (rate-limited: 20 req/min, 75KB text/min per IP, 20KB per request) | docs | | Lara Translate API
⭐⭐⭐⭐⭐ 5.0/5 · 1 review
| Translate text, documents, images and audio with context, style, glossaries and translation memories, and detect the language of text. | API key | ✅ | 🆓 Free: 10,000 API characters/month (shared by translation and language detection), no credit card required | docs |

Code execution sandboxes

Isolated cloud environments where an agent can run code, shells and whole dev environments safely. — 10 services. JSON: catalog/code-execution-sandbox.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | Cloudflare Sandbox SDK
⭐⭐⭐⭐⭐ 4.5/5 · 12 reviews
| Deploy a Cloudflare Worker embedding this SDK to run untrusted code in per-request container sandboxes. | API key | ✅ | requires Workers Paid plan ($5/mo) for Containers; no free tier for container-backed sandboxes | docs | | CodeSandbox SDK
| Programmatically create, resume, and control cloud VM sandboxes to run and preview AI-written code. | API key | — | 🆓 Free: Build (free) plan with 400 VM credits/month (~40 Nano-VM hours) and up to 10 concurrent VMs | docs | | Daytona
| Create elastic remote sandboxes via SDK/API to run AI-generated code with sub-second startup. | API key | ✅ | Trial: $200 free compute credit one-time on signup, no credit card required; first 5 GiB storage free; startup program up to $50k credits | docs | | E2B
| Spin up isolated Firecracker cloud sandboxes via SDK/REST to execute AI-generated code and return results. | API key | ✅ | Trial: one-time $100 usage credit on signup (Hobby, no card); up to 1 h per sandbox, 20 concurrent; then pay-as-you-go | docs | | Judge0 | Submit source code and stdin via REST to compile/run it in 60+ languages and poll for the result. | API key | — | Paid only on Judge0 Cloud (Pro EUR 27/mo for 2,000 submissions/day and up); self-host free & open-source (GPLv3) | docs | | Modal
| Programmatically launch serverless sandboxes, optionally with GPUs, to execute untrusted or agent code. | API key | ◐ | 🆓 Starter plan: $0 base + $30/mo free credits | docs | | Piston
| Compile and run code in 70+ languages inside isolated containers via a self-hostable REST API (the public instance needs a granted token). | API key | — | 🆓 Free: self-host (open source, Docker); public emkc.org API closed to open use since 2026-02-15, tokens only for approved non-commercial educational projects | docs | | Riza
| Call a REST API to execute untrusted Python/JS/Ruby/PHP code in sandboxes that start in under 10ms. | API key | ✅ | 🆓 Free tier: Hobby plan free forever, 100,000 requests/month, 30 s execution limit; then usage-based pricing | docs | | Runloop
| Create, snapshot, suspend/resume, and run commands in Linux Devboxes via API/SDK for agent coding tasks. | API key | ✅ | $50 free credits on signup, then usage-based ($0.108/CPU-hr, $0.0252/GB-hr) | docs | | Vercel Sandbox
⭐⭐⭐⭐⭐ 4.5/5 · 2 reviews
| Boot ephemeral Firecracker microVMs via SDK/REST to run agent- or AI-generated code and shell commands. | API key / OAuth | ✅ | 🆓 usage included on Hobby plan, otherwise usage-based on Pro/Enterprise | docs |

Developer platforms and DevOps

Source control, CI/CD, monitoring, error tracking, incident management and package registries. — 12 services. JSON: catalog/developer-devops.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | CircleCI API
⭐⭐⭐ 3.0/5 · 2 reviews | An agent can trigger pipelines, rerun workflows, fetch logs/test results, and validate CI/CD configuration via REST. | API key | ✅ | 🆓 free plan: 30,000 credits/month (~6,000 build minutes on a small Docker resource class), credits expire monthly | docs | | Datadog API
⭐⭐⭐⭐⭐ 4.9/5 · 7 reviews
| An agent can query metrics, logs, traces, monitors, and dashboards, and manage Datadog configuration via REST. | API key | ✅ | 🆓 free Infrastructure Monitoring plan: 1-day metric retention, up to 5 hosts; other products (APM, Logs, Security) are paid | docs | | Docker Hub API
⭐⭐⭐⭐⭐ 4.7/5 · 3 reviews
| An agent can search, push, pull, tag, and manage container images and repositories on Docker Hub. | API key | ✅ | 🆓 free personal accounts with rate-limited image pulls; paid Pro/Team/Business tiers raise pull limits | docs | | GitHub API
⭐⭐⭐⭐⭐ 4.7/5 · 21 reviews
| An agent can manage repositories, issues, pull requests, releases, and code search via REST or GraphQL. | API key / OAuth | ✅ | 🆓 free with any GitHub account; 5,000 req/hr authenticated, 60/hr unauthenticated | docs | | GitLab API
⭐⭐⭐⭐ 4.4/5 · 14 reviews
| An agent can manage projects, issues, merge requests, CI/CD pipelines, and repository files via REST/GraphQL. | API key / OAuth | ✅ | 🆓 free tier: full REST API access on GitLab.com Free plan; some features gated to Premium/Ultimate | docs | | Globalping Network Measurement API
| Lets an agent run ping, traceroute, MTR, DNS and HTTP tests from thousands of probes worldwide to check reachability, latency and routing of a host. | none | ✅ | 🆓 No key; 250 tests/hour anonymously (up to 50 probes per measurement), 500 tests/hour with a free account token (up to 500 probes); extra tests use credits. | docs | | Maven Central Search API
| Lets an agent search Maven Central for Java/JVM artifacts by groupId, artifactId, class name or SHA-1 and look up the latest versions before adding a dependency. | none | ◐ | 🆓 No key; free public API with no published quota (fair use). | docs | | PagerDuty API
⭐⭐⭐⭐⭐ 4.7/5 · 44 reviews
| An agent can create/manage incidents, on-call schedules, escalation policies, and services via REST. | API key / OAuth | ✅ | 🆓 free plan for up to 5 users: 100 monthly SMS/phone notifications, 1 on-call schedule, 1 escalation policy, API access | docs | | Postman API
⭐⭐⭐⭐⭐ 4.8/5 · 24 reviews
| An agent can manage Postman collections, workspaces, environments, mocks, monitors, and API specs via REST. | API key | ✅ | 🆓 Free plan: 10,000 Postman API calls/month; rate limits ~300 req/min general, stricter for specific endpoints | docs | | Reflag Management API
| Lets an agent create feature flags, change their targeting for users and companies, and evaluate flags at runtime. | API key / OAuth | ✅ | 🆓 Free Starter plan: 1,000 monthly tracked users, unlimited seats, 3 environments; no overage (upgrade required) | docs | | Sentry API
| An agent can query and triage error/performance issues and manage projects, releases, and org data. | API key / OAuth | ✅ | 🆓 free Developer plan: 1 user, 5,000 errors/mo, 5GB logs, 50 replays; includes MCP access | docs | | Supabase Management API | An agent can programmatically create and manage Supabase projects, databases, API keys, and config. | API key / OAuth | ✅ | 🆓 free plan available; rate limit 120 req/min per user/project (lower for heavier endpoints) | docs |

Cloud and hosting

Cloud providers, serverless and edge platforms, and site hosting an agent can deploy to and manage. — 11 services. JSON: catalog/cloud-hosting.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | AWS APIs
| An agent can provision and control thousands of AWS resources (compute, storage, databases, ML) via SDKs/CLI/REST. | cloud IAM | ✅ | 🆓 Free tier: 30+ services always free within monthly limits; new accounts also get up to $200 one-time credits ($100 on signup + up to $100 earned) usable over 6 months | docs | | Azure APIs
| An agent can deploy and manage Azure resources (compute, storage, databases, AI) across resource-provider REST APIs. | cloud IAM | ✅ | 🆓 12 months of select free services plus $200 credit for 30 days for new accounts; many services also have a permanent always-free monthly amount | docs | | Cloudflare API
⭐⭐⭐⭐⭐ 4.5/5 · 12 reviews
| An agent can manage DNS, Workers, zones, WAF/security rules, and caching for Cloudflare accounts programmatically. | API key / OAuth | ✅ | 🆓 free with any Cloudflare account; API access itself is free, manages both free and paid Cloudflare products | docs | | Easypanel | Lets an agent discover Easypanel server-management procedures and execute queries, mutations and destructive operations using the selected user’s permissions. | API key | ✅ | 🆓 free tier: 3 projects with unlimited services and deployments; self-hosted server costs are separate | docs | | Fly.io Machines API | An agent can create, start, stop, and destroy Fly.io Machines (lightweight VMs) programmatically via REST. | API key | ✅ | Trial: 2 machine-hours or 7 days, whichever comes first, no card needed to start (adding a card ends the trial); then pay-as-you-go, no perpetual free tier | docs | | Google Cloud APIs | An agent can create and manage Google Cloud resources (compute, storage, data, AI/ML) via REST, gRPC, or client libraries. | cloud IAM | ✅ | 🆓 free trial credit for new customers plus an Always Free tier with perpetual no-cost limits on select products | docs | | Mux Video API
| Upload, encode, stream and analyse video; get playback URLs, thumbnails and captions via REST. | API key | ✅ | 🆓 first 100,000 delivered minutes/month free, then usage-based | docs | | Netlify API
⭐⭐⭐⭐ 4.0/5 · 5 reviews | An agent can create/manage sites, trigger and monitor deploys, and configure DNS, domains, and env vars. | API key / OAuth | ✅ | 🆓 Free: $0 forever plan with 300 credits per month (hard limit, no rollover); API usage subject to account plan limits | docs | | Render API | An agent can create and manage Render services, trigger deployments, and configure databases and env vars. | API key | ✅ | 🆓 free static sites; free web services that spin down after inactivity | docs | | Tencent EdgeOne Pages (Makers) | Lets an agent deploy HTML pages, static sites and full-stack apps with edge functions to EdgeOne and get back a public URL. | API key | ✅ | 🆓 Free plan (stated as permanent): 40 projects, 500 builds/month, 3M Edge Function and 1M Cloud Function invocations/month, 5 GB storage, 1 GB KV, 1 GB Blob. | docs | | Vercel API
⭐⭐⭐⭐⭐ 4.5/5 · 2 reviews
| An agent can create deployments, manage projects/domains/env vars, and query analytics and logs. | API key / OAuth | ✅ | 🆓 free on Hobby plan; some resources/endpoints require Pro/paid plan | docs |

Databases

Managed SQL, NoSQL, key-value and analytics databases an agent can create, query and manage. — 12 services. JSON: catalog/databases.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | ClickHouse Cloud
⭐⭐⭐⭐⭐ 5.0/5 · 1 review
| Run SQL analytics queries and manage Cloud services/backups via REST API or official MCP server. | API key | ✅ | no permanent free tier; 30-day trial with $300 credits | docs | | Convex
| Introspect tables/functions, call functions, and read/write data in a reactive database via MCP or client SDKs. | API key | ✅ | 🆓 generous free tier for small apps, zero cost/maintenance | docs | | Google BigQuery
| Run SQL queries and inspect datasets/tables in BigQuery via REST API or the fully-managed remote MCP server. | cloud IAM | ✅ | 🆓 Free tier: 1 TiB of querying and 10 GiB of storage per month | docs | | MongoDB Atlas
⭐⭐⭐⭐⭐ 5.0/5 · 1 review
| Create/manage Atlas clusters and query MongoDB data via Admin API, drivers, or official MCP server. | API key / OAuth | ✅ | 🆓 free tier: M0 cluster free forever (512MB) | docs | | Neon Postgres
| Provision and manage serverless Postgres projects/branches and run SQL via REST API or MCP server. | API key / OAuth | ✅ | 🆓 Free tier: 100 projects; 0.5 GB storage, 100 CU-hours and 5 GB egress per project per month, no card required | docs | | PlanetScale
| Manage MySQL databases, branches, and schema, and view Insights via hosted MCP server or API. | API key / OAuth | ✅ | Paid only: no free or Hobby plan; cheapest is Postgres PS-5 single node at $5/month | docs | | Snowflake
⭐⭐⭐⭐⭐ 4.8/5 · 4 reviews
| Run SQL, Cortex Analyst, and Cortex Search over warehoused data via REST API or managed MCP server. | API key / OAuth | ✅ | trial credits (no permanent free tier); check pricing | docs | | Supabase
| Manage Postgres tables, auth, storage, and edge functions via REST/GraphQL APIs or client SDKs. | API key / OAuth | ✅ | 🆓 free tier: 2 projects, 500MB DB, 5GB bandwidth | docs | | TiDB Cloud API (Starter)
| Lets an agent create and manage serverless MySQL-compatible TiDB clusters and run SQL, full-text and vector search queries against them. | API key | ✅ | 🆓 Free: up to 5 Starter instances per org, 25 GiB row storage + 25 GiB columnar storage + 250M Request Units per month in total; no credit card | docs | | Tinybird API | Lets an agent ingest events into real-time ClickHouse-based data sources, run SQL queries and call published analytics API endpoints. | API key | ✅ | 🆓 Free plan: 10 GB storage, 1,000 API requests/day, 0.25 vCPU shared; no credit card | docs | | Turso
| Create and query edge SQLite (libSQL) databases programmatically via HTTP/SDK client libraries. | API key | ✅ | 🆓 Free tier: 100 databases, 5 GB storage, 500M rows read and 10M rows written per month, no card required | docs | | Upstash (Redis, Vector)
| Call serverless Redis, Vector, and QStash over HTTP REST API from edge/serverless runtimes. | API key | ✅ | 🆓 Free tier: Redis 256MB/500K cmds per month; Vector 10K queries+updates per day (max 200M vectors x dimensions, 1,536 dims) | docs |

Vector search, memory and RAG

Vector databases, retrieval (RAG) services and long-term memory layers for agents. — 9 services. JSON: catalog/databases-vector-memory.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | Agentset RAG API
| Lets an agent ingest documents into managed RAG namespaces and run semantic search or cited question answering over them. | API key | ✅ | 🆓 Free plan (forever): 1,000 pages ingested and 10,000 retrievals per month, 60 requests/min per namespace | docs | | Chroma Cloud
| Create databases and store/query vector embeddings for retrieval via REST/SDK or MCP server. | API key | ✅ | Trial: Starter plan $0/month base with $5 one-time free credits on signup, then usage-based pricing | docs | | Letta
| Create and run stateful agents with persistent memory blocks via REST API or hosted MCP server. | API key | ✅ | 🆓 Free: $0/month plan with up to 3 stateful agents and limited Letta Auto usage (bring your own API keys); API plan $20/month + usage | docs | | Mem0
| Add, search, update, and delete long-term agent memories via REST API or hosted MCP server. | API key | ✅ | 🆓 free (Hobby) tier: 10K add requests, 1K retrievals/mo, 1 project | docs | | Pinecone
| Upsert, query, and rerank vector embeddings in managed indexes via REST/SDK or MCP server. | API key | ✅ | 🆓 free tier (Starter plan, limited pods/reads) | docs | | Qdrant Cloud
| Create clusters and store/search vector embeddings via REST/gRPC API, SDKs, or official MCP server. | API key | ✅ | 🆓 Free tier: single-node cluster with 0.5 vCPU, 1 GB RAM, 4 GB disk, no card; suspends after 1 week idle | docs | | Weaviate Cloud
| Store and semantically search vector objects in a managed cluster via REST/GraphQL or MCP server. | API key | ✅ | 🆓 Free: always-free plan, 1 cluster, 100,000 objects, 1 GB memory, 10 GB disk, 1 collection, no card required | docs | | Zep
| Store and retrieve temporal knowledge-graph agent memory via REST API or a single MCP endpoint. | API key | ✅ | 🆓 Free tier: 10,000 credits per month, no rollover; variable rate limits | docs | | Zilliz Cloud (Milvus)
| Manage Milvus clusters and perform vector search/ingestion via REST API, SDKs, or MCP server. | API key | ✅ | 🆓 Free tier: serverless cluster, 5GB storage, 2.5M vCUs per month, up to 5 collections, no card; plus up to $200 one-time trial credits ($100 on signup + $100 on adding a card) | docs |

Email, team chat and notifications

Send and receive email, post to team chat (Slack, Discord), send push notifications; manage meetings. — 10 services. JSON: catalog/communication-email-chat.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | AgentMail
| Programmatically create inboxes and send/receive email autonomously, purpose-built for AI agents. | API key | ✅ | 🆓 Free: 3 inboxes, 3,000 emails/month (max 100/day), 3GB storage, no card required | docs | | Discord API
| Send messages, manage channels/roles, and build interactive bots via REST and Gateway API. | API key / OAuth | ◐ | 🆓 free, no key needed beyond creating a bot application | docs | | Mailgun
⭐ 1.0/5 · 1 review
| Send and validate transactional email via REST API and SMTP relay with webhooks. | API key | ✅ | 🆓 free: 100 emails/day; 30-day free trial on paid tiers | docs | | ntfy.sh Push Notifications API
| Lets an agent send push notifications to a user's phone or desktop by publishing a plain HTTP POST to an ntfy topic, and read messages back from it. | none | ◐ | 🆓 No key; anonymous publishing to public topics, rate-limited per visitor IP (burst of 60 requests, then 1 request every 5 s, roughly 17,280/day); paid plans from $6/month add reserved topics, higher limits, email and phone-call notifications. | docs | | Postmark
| Send transactional email via REST API with delivery tracking, bounce handling, and templates. | API key | ✅ | 🆓 free: 100 emails/month (Developer plan, no expiry) | docs | | Resend
⭐⭐⭐⭐ 4.0/5 · 1 review
| Send transactional and marketing email via REST API with templates, domains, and webhooks. | API key | ✅ | 🆓 free tier: 3,000 emails/mo, 100/day | docs | | SendGrid (Twilio)
⭐⭐⭐⭐ 3.9/5 · 8 reviews
| Send transactional and marketing email via REST/SMTP API with templates and analytics. | API key | — | Trial: 100 emails/day for 60 days, no card required; paid plan after | docs | | Slack API
⭐⭐⭐⭐⭐ 4.6/5 · 250 reviews
| Post messages, manage channels, and read conversation history in Slack via the Web API. | OAuth 2.0 | ✅ | 🆓 free, no key needed beyond creating a Slack app/workspace | docs | | Stream (GetStream) Chat & Video API
| Build and moderate in-app chat and video with REST/SDK APIs, channels, and real-time messaging. | API key | — | 🆓 Free tier: Build plan with 1,000 MAU/month and 100 concurrent connections, no card; Maker account gives $100/month credit for teams under 5 people and under $10k monthly revenue | docs | | Zoom API
| Schedule, update, and manage meetings, webinars, and cloud recordings programmatically via REST API. | OAuth 2.0 | ✅ | 🆓 usable on free Zoom account within Basic plan limits; some endpoints require paid plan | docs |

SMS and messaging apps

Send and receive SMS and messages on WhatsApp, LINE or Telegram through a messaging provider's API. — 10 services. JSON: catalog/sms-messaging.json

| Service | What an agent can do | Auth | MCP | Free tier | Docs | |---|---|---|:-:|---|---| | AWS End User Messaging SMS
| Send SMS, MMS and voice messages and manage sender numbers, opt-outs and registrations via the AWS SMS and Voice v2 API. | cloud IAM | ✅ | Paid only; US SMS $0.00774/message + $0.00421 carrier fee (10DLC or toll-free) | docs | | Bird (formerly MessageBird)
| Send SMS, email and WhatsApp messages, verify phone numbers and track delivery via REST API or hosted MCP. | API key / OAuth | ✅ | Paid only; prepaid wallet, US long code or toll-free $0.0035/SMS + carrier fees | docs | | LINE Messaging API
| Lets an agent send and reply to messages, rich messages and broadcasts to users of a LINE Official Account and read user profiles. | API key | ✅ | 🆓 Free Communication plan (Japan): 200 push/broadcast messages/month; reply messages are unlimited. Beyond that only paid plans (Light JPY 5,000 for 5,000 messages, Standard JPY 15,000 for 30,000). Free quotas vary by region | docs | | Sinch
⭐ 1.0/5 · 2 reviews
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