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Retell AI Voice API

The Voice API from Retell AI — 2 operation(s) for voice.

Retell AI Voice API is one of 11 APIs that Retell AI publishes on the APIs.io network, described by a machine-readable OpenAPI specification and an AsyncAPI event-driven specification.

Tagged areas include Voice. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, an API reference, an AsyncAPI specification, and rate-limit docs.

This API exposes 2 operations across 2 paths, and defines 1 schema. It is described by OpenAPI 3.0.1, at version 2.0.

Requests are made against a single base URL, https://api.retellai.com.

2 operations 2 paths 1 schemas 2 GET

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.0.1
API Version
2.0
Base URL
https://api.retellai.com
Authentication
HTTP Bearer
Terms of Service
Resource Areas
1

Authentication & Security 1

Retell AI Voice API declares 1 security scheme for authenticating requests. It accepts HTTP bearer tokens (apiKey) (api_key). By default, every request must be authenticated.

  • api_key — Retell API key, sent as: Authorization: Bearer

Paths & Operations 2

Across 2 paths, the API surfaces 2 operations — 2 GET. Each is listed below with its method, path, parameters, and response codes.

Voice 2
GET
/list-voices
List all available voices.
listVoices → 200
GET
/get-voice/{voice_id}
Retrieve a voice.
getVoice 1 param → 200

Schemas 1

The contract defines 1 schema that model the data the API accepts and returns. The most detailed is Voice (7 properties). Each schema is shown below with its type and property counts.

Voice
object
7 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

retell-voice-api-openapi.yml Raw ↑

Other APIs Retell AI publishes across the network.

Retell AI Agent API
Retell AI Batch Call API
Retell AI Call API
Retell AI Concurrency API
Retell AI Conversation Flow API
Retell AI Knowledge Base API
Retell AI Phone Call API
Retell AI Phone Number API
Retell AI Retell LLM API
Retell AI Web Call API