Retell AI API Documentation

This is the complete API documentation for connecting to the Retell AI API using MindCloud's Universal API. If you are new to MindCloud, start with the Introduction to see how one API can sit in front of many different apps.

MindCloud is an integration company that offers one normalized API to access 3,100+ apps from a single place. It cleans up provider-specific quirks, keeps requests and responses consistent, and centralizes authentication so you do not need to manage separate flows for every app. Browse other apps.

Meet Retell AI: Manage AI voice agents, chats, calls, and phone numbers. Keep reading to get started.

Quickstart

Before you run your first Retell AI request, you need three things:

1. A MindCloud account — sign in or create an account at MindCloud.
2. A MindCloud API Key — create one in API Keys. Keep it on your server.
3. At least one Retell AI connection — create or choose one in Connections. Note its connectionId.

Every Retell AI action uses the same URL pattern:

POST https://connect.mindcloud.co/v2/universal/apps/retellAI/actions/{actionSlug}/run

You need a MindCloud API Key and a Retell AI connection. Then call an action such as List Voices:

curl --request POST \
  --url "https://connect.mindcloud.co/v2/universal/apps/retellAI/actions/list-voices/run" \
  --header "Authorization: Bearer $MINDCLOUD_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
  "connectionId": "$CONNECTION_ID",
  "arguments": {}
}'

Every response comes back in the same envelope, with your rows in a data array:

{
  "success": true,
  "data": [
    { "id": "1042", "name": "Ava" }
  ],
  "meta": {}
}

After your first request works, use Shape your requests to control arguments, pagination, filtering, fields, and errors.

Authenticate with a MindCloud API Key plus a connectionId for your Retell AI account. See Retell AI API Authentication for the full flow and how to get your connection credentials.

Retell AI actions

All 30 published actions for this Retell AI version. Each page documents the endpoint, arguments, and response controls.

• PUTAdd Knowledge Base Sources
• POSTCreate Chat
• POSTCreate Chat Agent
• POSTCreate Knowledge Base
• POSTCreate Phone Call
• POSTCreate Retell LLM
• POSTCreate Voice Agent
• POSTCreate Web Call
• PUTEnd Chat
• GETGet Call
• GETGet Chat
• GETGet Chat Agent
• GETGet Knowledge Base
• GETGet Phone Number
• GETGet Retell LLM
• GETGet Voice Agent
• GETList Calls
• GETList Chat
• GETList Chat Agents
• GETList Knowledge Bases
• GETList Phone Numbers
• GETList Retell LLMs
• GETList Voice Agents
• GETList Voices
• PUTPublish Agent
• PUTPublish Chat Agent
• PUTUpdate Chat Agent
• PUTUpdate Phone Number
• PUTUpdate Retell LLM
• PUTUpdate Voice Agent

Related apps

More Support apps on the Universal API, behind the same REST shape. Or browse all apps.

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