# HeyGen Audio Models Listing

> HeyGen Audio Models Listing is a free API for AI agents from HeyGen at heygen.mpp.tempo.xyz, Free, status unknown (last checked 2026-10-31).

Returns the list of speech and transcription models available through HeyGen via OpenRouter, including prices per unit, available voices, and example requests

## Facts

- Endpoint: GET https://heygen.mpp.tempo.xyz/v1/audio/models?utm_source=zero.xyz
- Price: Free
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Provider: HeyGen
- Docs: https://openrouter.ai
- Website: https://www.heygen.com
- Tags: tts, speech, avatar, openrouter, ai
- Canonical page: https://www.zero.xyz/c/heygen-audio-models-listing-a2e9fe1b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_h2XhXo6qPyUNe18g0Oqm4

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 heygen-audio-models-listing-a2e9fe1b
```

Example prompt: Show me all the speech and transcription models available on HeyGen right now, including their prices per unit and the voices I can choose from.

## When to prefer this

Use this endpoint when you need to discover what HeyGen audio/speech models are currently available and their live pricing before submitting a speech generation request. Prefer this over hardcoding model names or prices, as the catalog and pricing can change. This is the right starting point before calling the HeyGen Speech generation endpoint.

## Known failure modes

- Service unavailable or network timeout returns an error response with no model data
- Empty model list if HeyGen temporarily removes all models from the pricing feed
- Stale pricing data if the underlying OpenRouter catalog has not refreshed recently

## How this service works

Speech and transcription models this service prices, with prices per unit, voices and an example request

## Output

A structured list of speech and transcription models offered by HeyGen via OpenRouter, each entry including the model identifier, price per unit (e.g. per character or per second), available voice options, and an example API request showing how to invoke that model.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/heygen-audio-models-listing-a2e9fe1b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from heygen.mpp.tempo.xyz](https://www.zero.xyz/host/heygen.mpp.tempo.xyz/llms.txt)