# ElevenLabs Speech Generation via OpenRouter

> ElevenLabs Speech Generation via OpenRouter is a paid API for AI agents from ElevenLabs at elevenlabs.mpp.tempo.xyz, paid per call via MPP, $0–$0.27/call (observed), live (last probed 2026-10-29, last successful call 2026-10-22).

Agents call it through Zero, which pays per call: no API key and no wallet of your own. New accounts start with $5.

Converts text to speech audio bytes using ElevenLabs voices, billed per character or audio unit via one-shot USDC payment

## Facts

- Endpoint: POST https://elevenlabs.mpp.tempo.xyz/v1/audio/speech?utm_source=zero.xyz
- Price: $0–$0.27/call (observed)
- Payment: MPP
- Status: healthy
- Last checked: 2026-10-29
- Last successful call: 2026-10-22
- Success rate: 99% of calls made through Zero
- Rating: 4.7 / 5 from 1 review
- Activations on Zero: 145
- Provider: ElevenLabs
- Docs: https://openrouter.ai
- Website: https://openrouter.ai
- Tags: ai
- Canonical page: https://www.zero.xyz/c/elevenlabs-speech-generation-via-openrouter-2bed1774
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_alSgJqkLN4_80QETpJfNW

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 elevenlabs-speech-generation-via-openrouter-2bed1774 -d '<json body>'
```

Example prompt: Use ElevenLabs to generate a spoken audio clip of the following text in a natural, conversational voice: 'Welcome to our product launch event — we're thrilled to have you here today.'

## When to prefer this

Choose this endpoint when you need high-quality, natural-sounding text-to-speech synthesis powered by ElevenLabs' voice models, with one-shot USDC payment via OpenRouter. Ideal for agents that need to generate audio dynamically without managing API keys or subscriptions. Prefer this over generic TTS services when voice quality, expressiveness, and ElevenLabs' specific voice library matter. Best for on-demand narration, voiceovers, and spoken content generation tasks.

## Known failure modes

- Invalid or unsupported voice ID returns an error
- Text input too long or exceeds model limits causes rejection
- Unsupported output audio format requested
- Payment failure or insufficient USDC balance blocks the request
- Unknown or deprecated model ID results in a 404 or bad request error
- Empty text input returns a validation error

## How this service works

Generate speech/audio bytes (one-shot charge; character or bounded audio pricing; models, prices and voices at GET /v1/audio/models)

## Output

Returns raw audio bytes (e.g. MP3 or PCM audio) of the synthesized speech, ready for playback or storage. The audio is generated by ElevenLabs models and priced per character or bounded audio unit, with available models and voices discoverable via the companion GET /v1/audio/models endpoint.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/elevenlabs-speech-generation-via-openrouter-2bed1774/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from elevenlabs.mpp.tempo.xyz](https://www.zero.xyz/host/elevenlabs.mpp.tempo.xyz/llms.txt)