About CoreNexis API
CoreNexis API provides document, image, and data-quality APIs through a hosted service, with access for both developers and AI agents. Its remote MCP server makes the same API operations available as tools using the account's API key.
Key features
- 01Convert Markdown and HTML to PDF
- 02Extract text from images and PDFs with OCR
- 03Validate email addresses and detect disposables
- 04Convert, resize, compress, and host images
- 05Generate QR codes and barcodes
Use cases
- 01Create PDFs from page content or Markdown
- 02Extract text from scanned documents and receipts
- 03Check email addresses before accepting them
- 04Convert images and create QR or barcode assets
MCP support
The remote MCP server exposes tools for the platform's APIs, including PDF generation, OCR, email checks, image processing, hosting, and code generation. Calls use the user's API key and count against the same API quotas.
Configuration
Remote servers need no local install. Pick your client, then copy the config or install in one click.
https://api.corenexis.com/mcp/serverclaude mcp add --transport http com-corenexis-api https://api.corenexis.com/mcp/server{"mcpServers":{"com-corenexis-api":{"type":"http","url":"https://api.corenexis.com/mcp/server"}}}Open in Cursor{"servers":{"com-corenexis-api":{"type":"http","url":"https://api.corenexis.com/mcp/server"}}}Open in VS Code{"mcpServers":{"com-corenexis-api":{"type":"http","url":"https://api.corenexis.com/mcp/server"}}}{"mcpServers":{"com-corenexis-api":{"serverUrl":"https://api.corenexis.com/mcp/server"}}}Run commands in a terminal; paste JSON into the client’s MCP config and restart. Servers that need sign-in will prompt on first connect.
https://api.corenexis.com/mcp/serverAuth requiredTools
Details
From the project README
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": "[email protected]"}'
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 [email protected]
Built by Corenexis. This repository holds documentation and examples; the API service is hosted by Corenexis. Examples are released under the MIT License.
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