To authenticate with the Prospeo API, add the header X-KEY to your request.
You can find your API key on your dashboard (opens in a new tab).


  • The host is
  • All requests should be made with HTTPS
  • All of our endpoints accept the POST method only

You are required to add the header Content-Type: application/json

curl -X POST \
 -H "Content-Type: application/json" \
 -H "X-KEY: your_api_key" \
 -d '{
   "first_name": "John",
   "last_name": "Doe",
   "company": ""
   }' \



Read the error handling page to handle particular error codes.

  • All the response will be in the JSON format.
  • Each response will always contain an error property: false if the request was successful, true otherwise
  • Response codes:
    • 200 : Valid request
    • 400 : An error occurred
    • 401 : Invalid API key
    • 429 : Rate limit exceeded
    • See error handling page for more info.

Example of a successful response (Email Finder API)

   "error": false,
   "response": {
       "free": false,
       "email": "[email protected]",
       "email_anon_id": "24Z97EARRT",
       "email_status": "VALID",
       "first_name": "Ewa",
       "last_name": "Kadlool",
       "domain": "",
       "total_emails": 194

Example of an error response

   "error": true,
   "message": "INVALID_PARAM",
   "details": "Invalid first_name param."