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Ultravox API

Ultravox API

Build real-time, multimodal AI applications.
Quick Start Read the docs

Intro

The Ultravox API enables developers to build speech-to-speech AI applications. Built on the open source Ultravox LLM, the Ultravox API provides a simple REST API for creating calls with AI agents.

Ultravox REST API

We expect most applications to have a backend that will use the Ultravox REST API to create calls (and secure the API key).

The Ultravox API base url is http://api.ultravox.ai.

The API requires an API key and currently provides the following endpoints:

  • Accounts (/api/accounts)
  • Calls (/api/calls)
  • Tools (/api/tools)
  • Voices (/api/voices)
  • Webhooks (/api/webhooks)

Authorization

Pass in an API key using the X-API-Key header.

OpenAPI Specification

There is an OpenAPI spec file available. Additionally, you can use the Ultravox API Playground to quickly explore and test the API.

Client SDKs

While there is a RESTful API for Ultravox that is used to create calls, you will need to use one of our client SDKs to join and end calls.

There are currently five implementations of the SDK available:

JavaScript

JavaScript logo
npm install ultravox-client
Available in the npm registry

Flutter

Flutter logo
flutter add ultravox_client
Get it on pub.dev

Python

Python logo
pip install ultravox-client
More info on PyPi

Please let us know if you need a client for a specific language or framework.

Next steps

  1. Get an API Key → Sign-up for a free account. Then generate an API key. Each new account comes with 30 free minutes for creating calls.

  2. Do the Quickstart → Build your first voice-enabled AI agent in minutes.

  3. Read the Docs → Learn more in the API Reference.