# CallHeater API

## Docs

- [Check API Key Credits](https://docs.callheater.com/api-reference/endpoint/credits.md): Verifies the provided API key and returns its remaining credit balance.
- [Check API Health](https://docs.callheater.com/api-reference/endpoint/health.md): Returns a simple status response when the API is online.
- [Lookup Phone Number](https://docs.callheater.com/api-reference/endpoint/lookup.md): Returns caller context for a US phone number. The default response is JSON; use `display=pretty` for a human-readable text response.
- [API Reference](https://docs.callheater.com/api-reference/introduction.md): Customer-facing reference for CallHeater lookup endpoints.

## OpenAPI Specs

- [openapi](https://docs.callheater.com/api-reference/openapi.json)