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Documentation Index

Fetch the complete documentation index at: https://docs.leadx.com/llms.txt

Use this file to discover all available pages before exploring further.

Every request to the LeadX API must include your API key in the header. Without it, your requests will be rejected with a 401 Unauthorized error. 
X-API-KEY: YOUR_API_KEY
Keep your key private; treat it like a password. Add the API key as a header with X-API-Key.
Terminal
curl -X POST "https://api.leadx.com/v1/companies" \
  -H "X-API-KEY: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"url": "company.com"}'
You can also use your API key along with the interactive tool in the Endpoints section of this documentation to:
  • Run API calls directly from your browser
  • Experiment with different endpoints and parameters
  • View live JSON responses
This makes it easy to test the API before adding it into your codebase.
Last modified on March 23, 2026