# Speech-to-Text Whisper MCP

> Speech-to-Text Whisper MCP is a paid API for AI agents from api.m2mcent.com, paid per call via x402, $0.08/call, status unknown (last checked 2026-10-09).

Transcribes audio or speech input into text using a Whisper-based model via a paid MCP-compatible API endpoint.

## Facts

- Endpoint: POST https://api.m2mcent.com/speech-to-text-whisper-mcp/api/process?utm_source=zero.xyz
- Price: $0.08/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-09
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/speech-to-text-whisper-mcp-58850317
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CyIrRpncxU9VouaCDFVpL

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 speech-to-text-whisper-mcp-58850317 -d '<json body>'
```

Example prompt: Can you transcribe this audio recording for me? Here's the base64-encoded audio data — just give me the plain text transcript of what was said.

## When to prefer this

Use this endpoint when you need reliable Whisper-based speech-to-text transcription via a pay-per-call MCP-compatible API, especially in agentic workflows that support x402 micropayments and need to avoid managing API keys or subscriptions.

## Known failure modes

- Invalid or malformed audio data string returns an error
- Unsupported audio format may fail to decode
- Empty or missing 'data' field returns a validation error
- Audio too short or silent may return empty transcript
- Payment failure or insufficient USDC balance blocks the request

## How this service works

The premier global index of 1,069 monetized MCP nodes across 205 specialized subdomains. Gasless USDC runtime settlements via x402 V2 Spec on Base L2. Save 95% token context.

## Output

Returns a text transcript of the spoken content in the provided audio input, converted using Whisper speech recognition.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/speech-to-text-whisper-mcp-58850317/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.m2mcent.com](https://www.zero.xyz/host/api.m2mcent.com/llms.txt)