CoreNexis API
PDF from HTML or Markdown, OCR, email validation, image conversion and hosting, QR and barcodes.
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).
claude mcp add --transport http corenexis-api 'https://api.corenexis.com/mcp/server' --header 'x-api-key: <Your CoreNexis API key from dash.corenexis.com>'{
"mcpServers": {
"corenexis-api": {
"type": "http",
"url": "https://api.corenexis.com/mcp/server",
"headers": {
"x-api-key": "<Your CoreNexis API key from dash.corenexis.com>"
}
}
}
}Documentation
From the project's README on GitHub, refreshed weekly. Links open on GitHub.
Contents
Corenexis API and MCP Server
9+ production REST APIs behind one API key, plus a remote MCP server so AI agents can use them.
PDF generation, OCR, email validation, image conversion, image CDN and QR codes.
Website · MCP guide · Get an API key · MCP Registry
What is the Corenexis API?
The Corenexis API Platform is a set of production REST APIs for documents, images and data quality. One key, one header, predictable JSON - and a free tier on every API. The same APIs are available to AI assistants through a remote MCP server, so ChatGPT, Claude, n8n or your own agent can generate a PDF, read a scanned receipt or validate an email in the middle of a conversation.
| REST API | https://api.corenexis.com/<api>/v1 - header x-api-key |
| MCP server | https://api.corenexis.com/mcp/server - Streamable HTTP, API key |
| Registry name | com.corenexis/api on the Official MCP Registry |
| n8n | Community node in Core-Nexis/n8n-nodes-corenexis-api |
| Dashboard | https://dash.corenexis.com - keys, subscriptions, usage |
APIs
| API | Endpoint | What it does | Docs |
|---|---|---|---|
| Markdown to PDF | POST /markdown-to-pdf/v1 | Markdown into a print-ready PDF or page images | docs |
| HTML to PDF | POST /html-to-pdf/v1 | HTML and CSS rendered by a real browser engine into a PDF or screenshot | docs |
| Image to Text (OCR) | /image-ocr/v1 | Text out of photos, screenshots, scans and receipts | docs |
| PDF to Text (OCR) | /pdf-to-text/v1 | Text from PDFs, scanned pages included, as a background job | docs |
| Email Validator | /email-validator/v1 | Syntax, domain, mailbox and risk checks | docs |
| Disposable Email Detector | /disposable-email-validator/v1 | Tell a throwaway address from a real one | docs |
| Image Conversion | /image-conversion/v1 | Convert, resize and compress images | docs |
| Image CDN | /image-cdn/v3 | Host an image and get a fast delivery link | docs |
| QR Code and Barcode | /qr-barcode/v1 | QR, UPI QR, Code128, EAN-13 and UPC-A codes | docs |
Every request and response example: docs/apis.md.
Quick start
- Sign up at https://dash.corenexis.com/auth/signup and create a key at https://dash.corenexis.com/api-keys.
- Subscribe to the APIs you need (each has a free tier). One key works for all of them.
- Call an API:
curl -X POST https://api.corenexis.com/email-validator/v1 \
-H "x-api-key: your_api_key" \
-H "Content-Type: application/json" \
-d '{"email": "john.doe@company.com"}'MCP server
Point any MCP client at https://api.corenexis.com/mcp/server with your key in x-api-key.
Claude, Cursor, VS Code and other MCP clients
{
"mcpServers": {
"corenexis": {
"type": "http",
"url": "https://api.corenexis.com/mcp/server",
"headers": { "x-api-key": "your_api_key" }
}
}
}Claude Code
claude mcp add --transport http corenexis https://api.corenexis.com/mcp/server \
--header "x-api-key: your_api_key"n8n
MCP Client node: connection HTTP Streamable, endpoint https://api.corenexis.com/mcp/server,
authentication Header Auth with name x-api-key and your key as the value.
curl
curl -X POST "https://api.corenexis.com/mcp/server" \
-H "x-api-key: your_api_key" \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'Tools
| Tool | What it does | Quota |
|---|---|---|
corenexis_list_apis | Every API with its tools, docs and subscribe links | free |
corenexis_account | Check the key and the account | free |
corenexis_subscriptions | Subscribed APIs with plan, status, renewal and usage | free |
corenexis_api_details | One API's plans, features and limits | free |
markdown_to_pdf | Markdown to PDF or images, returns a hosted link | 1 call |
html_to_pdf | HTML and CSS to PDF or image with a browser engine | 1 call |
image_to_text | OCR of a photo, screenshot or scan from a URL or base64 | 1 call |
pdf_to_text | Start PDF text extraction, returns a job_id | 1 call |
pdf_to_text_status | Collect a pdf_to_text result | free |
email_validate | Full email check: syntax, domain, mailbox, risk | 1 call |
disposable_email_check | Is the address from a disposable provider | 1 call |
image_convert | Convert, resize or compress an image, returns a hosted link | 1 call |
image_cdn_upload | Host an image and get a delivery link | 1 call |
qr_barcode_generate | QR, UPI QR or barcode image, returns a hosted link | 1 call |
The MCP server holds no keys of its own: every tool call is the same REST call made with your key and
counts against the same quota. Full reference: docs/mcp.md.
Screenshots
Links
- Website: https://api.corenexis.com
- MCP guide: https://api.corenexis.com/mcp
- Dashboard: https://dash.corenexis.com
- MCP health: https://api.corenexis.com/mcp/health
- Support: https://helpdesk.corenexis.com or support@corenexis.com
Built by Corenexis. This repository holds documentation and examples; the API service is hosted by Corenexis. Examples are released under the MIT License.
Frequently asked questions
What is CoreNexis API?
PDF from HTML or Markdown, OCR, email validation, image conversion and hosting, QR and barcodes.
How do I install CoreNexis API?
It runs as a remote server. In Claude Code: claude mcp add --transport http corenexis-api 'https://api.corenexis.com/mcp/server' --header 'x-api-key: <Your CoreNexis API key from dash.corenexis.com>'. For other clients, paste the JSON configuration from this page into their MCP settings.
Does CoreNexis API need an API key?
Yes. It expects x-api-key, which you set in its configuration.
Is CoreNexis API open source?
Yes. Its code is on GitHub under the MIT license.
Who maintains CoreNexis API?
It is published by Core-Nexis. 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.