# AgentPhone Voices List

> AgentPhone Voices List is a paid API for AI agents from AgentPhone at mpp.orthogonal.com, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-09, last successful call 2026-06-19).

Lists all available text-to-speech voices across providers (ElevenLabs, Cartesia, OpenAI, etc.) that can be used when creating or configuring AI phone agents.

## Facts

- Endpoint: GET https://mpp.orthogonal.com/agentphone/v1/agents/voices?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-09
- Last successful call: 2026-06-19
- Success rate: 100% of calls made through Zero
- Rating: 4.3 / 5 from 1 review
- Activations on Zero: 1
- Provider: AgentPhone
- Docs: https://api.agentphone.ai
- Website: https://api.agentphone.ai
- Tags: phone, voice, sms, calls, social
- Canonical page: https://www.zero.xyz/c/agentphone-voices-list-80607b1b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ap9lbm4_wlCcmTjX3OM6I

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability agentphone-voices-list-80607b1b
```

Example prompt: Can you show me all the voices available for my AI phone agent on AgentPhone, including which provider each voice comes from like ElevenLabs, Cartesia, or OpenAI?

## When to prefer this

Use this endpoint when you need to discover available voice options before creating or updating an AI phone agent, or when you want to let a user browse and select a voice for their agent. This is the canonical discovery step before calling the Agents creation endpoint.

## Known failure modes

- Authentication failure if API key is missing or invalid
- Upstream provider outage causing incomplete voice list
- Rate limit exceeded returning 429 error
- Service unavailable returning 503 if AgentPhone backend is down

## How this service works

List all available voices across providers (ElevenLabs, Cartesia, OpenAI, etc).

## Output

A list of available voice options across all supported TTS providers (ElevenLabs, Cartesia, OpenAI, etc.), including voice IDs, names, and provider affiliations that can be used when creating or configuring AI phone agents.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentphone-voices-list-80607b1b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mpp.orthogonal.com](https://www.zero.xyz/host/mpp.orthogonal.com/llms.txt)