# ZeroReader Whisper Speech-to-Text

> ZeroReader Whisper Speech-to-Text is a paid API for AI agents from api.zeroreader.com, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-02).

Transcribes audio input into text using OpenAI Whisper, supporting 90+ languages.

## Facts

- Endpoint: POST https://api.zeroreader.com/v1/ai/whisper?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/zeroreader-whisper-speech-to-text-8977ce90
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_h0ejG2GhP1q8FMGVWbetr

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 zeroreader-whisper-speech-to-text-8977ce90 -d '<json body>'
```

Example prompt: Can you transcribe this audio recording for me? Here's the binary audio data — I need the spoken words converted to text.

## When to prefer this

Use this endpoint when you need accurate, multilingual speech-to-text transcription backed by OpenAI Whisper, especially when paying per-call via x402/USDC is acceptable and you want a simple POST with raw audio binary.

## Known failure modes

- Audio binary data missing or malformed — returns error
- Unsupported audio format — transcription fails
- Audio too long or too large — request times out or is rejected
- Inaudible or low-quality audio — transcript may be inaccurate or empty
- Payment not provided — 402 Payment Required

## How this service works

Whisper (Speech-to-Text) — OpenAI Whisper. Transcription in 90+ languages.

## Output

A plain text string containing the transcribed content of the submitted audio, produced by OpenAI Whisper across any of 90+ supported languages.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "audio": {
   "type": "string",
   "description": "Audio data as binary"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "text": "Transcribed text from audio"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/zeroreader-whisper-speech-to-text-8977ce90/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.zeroreader.com](https://www.zero.xyz/host/api.zeroreader.com/llms.txt)