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ValidKit

Official registry Other

Validate IBAN, EU VAT, card numbers, ISBN, BIC, EAN and postcodes

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http validkit 'https://validkit-iban-vat-card-isbn-bic-postcode-validator.p.rapidapi.com/mcp' --header 'X-RapidAPI-Key: <Your RapidAPI key (subscribe to ValidKit on RapidAPI; free plan available)>' --header 'X-RapidAPI-Host: <RapidAPI host for this API>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "validkit": {
            "type": "http",
            "url": "https://validkit-iban-vat-card-isbn-bic-postcode-validator.p.rapidapi.com/mcp",
            "headers": {
                "X-RapidAPI-Key": "<Your RapidAPI key (subscribe to ValidKit on RapidAPI; free plan available)>",
                "X-RapidAPI-Host": "<RapidAPI host for this API>"
            }
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Developer utility APIs + remote MCP servers
  2. The APIs
  3. Quickstart (REST)
  4. Quickstart (MCP)
  5. What's in this repo
  6. Data and licences
  7. Support

Developer utility APIs + remote MCP servers

Thirteen small, focused REST APIs for everyday developer jobs: validating emails, phones and IBANs, IP geolocation, PDFs, images, QR codes, fraud scoring, token counting and more. Each one is its own product on RapidAPI with a free plan, full OpenAPI docs, and a built-in remote MCP server so AI agents (Claude, Cursor, VS Code, n8n, LangChain) can call it as tools.

  • Free tier on every API: subscribe on RapidAPI, copy your key, call it.
  • MCP built in: every API exposes Streamable HTTP MCP at https://<host>.p.rapidapi.com/mcp, and each is listed in the official MCP Registry as io.github.OlsOls4/<kit>.
  • No heavy dependencies on your side: plain HTTPS + JSON from any language or no-code tool.

The APIs

APIWhat it doesRapidAPIMCP endpointTutorial
WebKitEmail validation, link previews and article-to-Markdown extraction for AI agentsListinghttps://webkit-email-validator-link-preview-article-extractor.p.rapidapi.com/mcpdev.to
DomainKitDNS records, SSL certificate, WHOIS/RDAP and website tech scan for any domainListinghttps://domainkit-dns-ssl-whois-website-tech-lookup.p.rapidapi.com/mcpdev.to
QRKitGenerate QR codes (URL, WiFi, vCard) and barcodes as PNG/SVGListinghttps://qrkit-qr-code-barcode-generator.p.rapidapi.com/mcpdev.to
TextKitSentiment, language detection, readability, keywords, summaries and profanity filteringListinghttps://textkit-sentiment-language-readability-keywords.p.rapidapi.com/mcpdev.to
PhoneKitPhone number validation, formatting, carrier, line type and timezoneListinghttps://phonekit-phone-number-validation-carrier-line-type.p.rapidapi.com/mcpdev.to
ValidKitValidate IBAN, EU VAT, card numbers, ISBN, BIC, EAN and postcodesListinghttps://validkit-iban-vat-card-isbn-bic-postcode-validator.p.rapidapi.com/mcpdev.to
GeoIPIP geolocation: country, continent, ASN and ISP lookupListinghttps://geoip-ip-geolocation-asn-isp-lookup.p.rapidapi.com/mcpdev.to
DocKitExtract text and metadata from PDFs; convert Markdown or text to PDFListinghttps://dockit-pdf-text-extraction-markdown-to-pdf.p.rapidapi.com/mcpdev.to
FraudKitFraud risk score for signups and orders from email, IP, phone and user-agentListinghttps://fraudkit-fraud-risk-score-for-signups-orders.p.rapidapi.com/mcpdev.to
ImageKitResize, convert to WebP, compress, crop, rotate and strip EXIF from imagesListinghttps://imagekit-resize-convert-to-webp-compress-crop.p.rapidapi.com/mcpdev.to
UK PostcodeKitUK postcode lookup, nearest postcodes, autocomplete and distance (OS open data)Listinghttps://uk-postcodekit-postcode-lookup-nearest-distance.p.rapidapi.com/mcpdev.to
LLMKitToken counting, RAG chunking, truncation, HTML to Markdown and JSON repairListinghttps://llmkit-token-counter-rag-chunker-json-repair.p.rapidapi.com/mcpdev.to
CalKitPublic holidays for 150+ countries, business-day maths and timezone lookupListinghttps://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcpdev.to

Also available (newer):

  • CurrencyKit: ECB euro reference exchange rates: latest, historical, time series and currency conversion. RapidAPI · MCP https://currencykit-ecb-exchange-rates-currency-converter.p.rapidapi.com/mcp
  • VATKit: Live EU VAT number checks via VIES with company name/address, VAT formats and EU VAT rates. RapidAPI · MCP https://vatkit-eu-vat-number-check-vies-vat-rates.p.rapidapi.com/mcp

Quickstart (REST)

curl -G "https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/business-days/add" \
  -d date=2026-12-23 -d days=5 -d country=GB -d subdiv=ENG \
  -H "X-RapidAPI-Key: YOUR_RAPIDAPI_KEY" \
  -H "X-RapidAPI-Host: calkit-public-holidays-business-days-timezones.p.rapidapi.com"

Swap the host for any API in the table. Every request goes through RapidAPI with X-RapidAPI-Key and X-RapidAPI-Host.

Quickstart (MCP)

Add any API as a remote MCP server in a client that supports Streamable HTTP with custom headers, for example:

{
  "mcpServers": {
    "calkit": {
      "type": "http",
      "url": "https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp",
      "headers": {
        "X-RapidAPI-Key": "YOUR_RAPIDAPI_KEY",
        "X-RapidAPI-Host": "calkit-public-holidays-business-days-timezones.p.rapidapi.com"
      }
    }
  }
}

The server answers tools/list with that API's endpoints as tools.

What's in this repo

  • main.py and one folder per API (webkit, domainkit, qrkit, ...): the FastAPI service behind all listings.
  • mcpserver.py: the MCP layer that turns each API's routes into tools.
  • openapi/: OpenAPI specs for each API.
  • mcp-registry/: server.json files published to the official MCP Registry.

Data and licences

GeoIP and FraudKit use DB-IP Lite (CC BY 4.0). UK PostcodeKit uses OS Code-Point Open (Open Government Licence v3.0; contains OS data © Crown copyright and database right). PhoneKit uses Google libphonenumber (Apache 2.0). Full attributions are in each API's docs on RapidAPI.

Support

Questions, bugs or feature requests: open an issue or use the Discussions tab on the RapidAPI listing.

Frequently asked questions

What is ValidKit?

Validate IBAN, EU VAT, card numbers, ISBN, BIC, EAN and postcodes

How do I install ValidKit?

It runs as a remote server. In Claude Code: claude mcp add --transport http validkit 'https://validkit-iban-vat-card-isbn-bic-postcode-validator.p.rapidapi.com/mcp' --header 'X-RapidAPI-Key: <Your RapidAPI key (subscribe to ValidKit on RapidAPI; free plan available)>' --header 'X-RapidAPI-Host: <RapidAPI host for this API>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does ValidKit need an API key?

Yes. It expects X-RapidAPI-Key, X-RapidAPI-Host, which you set in its configuration.

Is ValidKit open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains ValidKit?

It is published by OlsOls4. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.