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The CallHeater API accepts phone lookup requests and returns caller context as JSON or plain text.

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Base URL

https://api.callheater.com

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Authentication

Send your provided API key in the X-API-Key header. 
curl "https://api.callheater.com/lookup?phone=4155550123" \
  -H "X-API-Key: YOUR_API_KEY"

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Endpoints

Lookup a phone number

Return caller context for a phone number.

Check API health

Confirm the API is online.

Check API key credits

Verify an API key and view its credit balance.