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The telli API is a REST API with JSON request and response bodies. Use it to manage contacts and contact properties, trigger and schedule calls, retrieve call results, and work with agents and phone numbers. For real-time call events, pair it with webhooks. If you would rather integrate without writing code, telli also connects to CRMs and automation platforms. See the integrations overview.
AuthenticationAll endpoints authenticate with an API key from the telli app (Settings > Developer), sent as a bearer token:

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OpenAPI specification

Every endpoint in this reference is generated from the API’s OpenAPI files. Download them to generate client libraries, import the API into tools like Postman, or give coding agents machine-readable API context: Contact endpoints exist in both versions. Use V2 for new integrations, and see the migration guide if you are still on the deprecated V1 contact endpoints.

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Base URLs