canonical: https://jentic.com/apis/retellai.com/retellai

# Retell AI API

API for managing AI voice agents, phone calls, conversations, and more. The API exposes 29 endpoints secured with bearer authentication.

## For AI agents

Programmatically create phone call, register phone call. Covers 29 operations with bearer authentication.

## Scope

Does not handle payments, crm, or developer tools - use for communications only.

## Capabilities

- Create phone call
- Register phone call
- Get call
- List calls
- Update call
- Delete call

## Use cases

### Communications Operations

Use the Retell AI API to perform communications operations programmatically. The API provides 29 endpoints covering core functionality including create phone call, register phone call, create web call.

Example prompt: Call POST /v2/create-phone-call to create phone call

### Automated Agents Management

Automate agents operations by combining multiple Retell AI API endpoints. Agents can register phone call and then create web call in a single workflow.

Example prompt: Call POST /v2/register-phone-call to register phone call, then verify the result

### AI Agent Integration via Jentic

AI agents discover and call Retell AI API endpoints through Jentic without managing credentials directly. An agent searches for the required operation by intent, receives the matching endpoint schema, and executes the call with Jentic-managed authentication. This eliminates the need to read API documentation or handle bearer tokens manually.

Example prompt: Search Jentic for 'create phone call', load the operation schema, and execute with Jentic-managed credentials

## Key endpoints

| Method | Path | Description |
| --- | --- | --- |
| POST | /v2/create-phone-call | Create phone call |
| POST | /v2/register-phone-call | Register phone call |
| POST | /v2/create-web-call | Create web call |
| GET | /v2/get-call/{call_id} | Get call |
| GET | /v2/list-calls | List calls |
| PATCH | /v2/update-call/{call_id} | Update call |
| DELETE | /v2/delete-call/{call_id} | Delete call |
| POST | /v2/create-agent | Create voice agent |

## Key resources

- **Agents** — Operations related to Agents
- **Calls** — Operations related to Calls
- **Knowledge Base** — Operations related to Knowledge Base
- **LLM** — Operations related to LLM
- **Phone Numbers** — Operations related to Phone Numbers

## Why Jentic

- **Setup:** Wiring the Retell AI API by hand means learning its bearer token auth, targeting the api.retellai.com host, and coordinating call and agent lifecycle calls yourself. Through Jentic you install once, import Retell AI API from the API Directory, store the token once, and your agent calls it.
- **Permission scoping:** Retell AI API puts the call id in the URL path (/v2/get-call/{call_id}), so a rule can pin your agent to one call: it can read and update that call and nothing else. You choose the operations it may call, so destructive ones like call deletion are not included unless you add them.
- **Credential handling:** Your Retell AI API token is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.
- **Discovery method:** Agents search Jentic by intent such as 'create a phone call' or 'get a call by id', and Jentic returns the matching Retell AI API operation with its input schema so the agent calls the right endpoint without browsing the reference docs.

## Related APIs

- **Twilio** — Alternative communications API
- **Sendgrid** — Alternative communications API
- **Pusher** — Complementary communications API

## FAQ

### What authentication does the Retell AI API use?

The Retell AI API uses a Bearer token in the Authorization header. Through Jentic, these credentials are stored encrypted in your Jentic One instance and injected at execution time, so raw secrets never enter the agent context.

### Can I create phone call with the Retell AI API?

Yes. Use the POST /v2/create-phone-call endpoint. The API returns structured JSON responses that agents can parse and act on directly.

### What are the rate limits for the Retell AI API?

Rate limits are not specified in the OpenAPI spec. Check the vendor documentation for current limits. Through Jentic, rate limiting is handled automatically with retry logic built into the execution layer.

### How do I create phone call through Jentic?

Install the Jentic SDK with pip install jentic, authenticate through Jentic One, the self-hosted execution layer, then search for 'create phone call'. Jentic returns the matching Retell AI API operation with its input schema. Load the schema and execute the call - credentials are injected automatically.

### How many endpoints does the Retell AI API have?

The Retell AI API exposes 29 endpoints covering agents, calls, knowledge base operations.

### Can I limit what my agent is allowed to do with the Retell AI API?

Yes. Jentic One is self-hosted, so your own rules decide which Retell AI API operations and credentials your agent may use. Because this API puts the call id in the URL path, such as /v2/get-call/{call_id}, you can pin an agent to a single call so it only reads and updates that call and nothing else. You choose the operations it may run, so destructive ones like DELETE /v2/delete-call/{call_id} stay off limits unless you add them.