# CivicMerge x402 Speech-to-Text Transcription

> CivicMerge x402 Speech-to-Text Transcription is a paid API for AI agents from x402-ai-api.civicmerge.workers.dev, paid per call via x402, $0.020000/call, status unknown (last checked 2026-09-16).

Transcribes an uploaded audio file to text using AI-powered speech recognition, billed per call via x402 micropayment protocol

## Facts

- Endpoint: POST https://x402-ai-api.civicmerge.workers.dev/v1/audio/transcribe
- Price: $0.020000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 1
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-ai-api-civicmerge-workers-dev-b78c4a7e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kt5zpuLN_R_RPSGo-QElT

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 x402-ai-api-civicmerge-workers-dev-b78c4a7e -d '<json body>'
```

Example prompt: Can you transcribe this audio file I'm uploading — it's a recorded voice note from my meeting this morning — and give me the full text transcript?

## When to prefer this

Choose this endpoint when you need per-call micropayment-based speech-to-text transcription without a subscription, especially in agentic workflows using the x402 payment protocol. Ideal for low-volume or pay-as-you-go transcription needs on Cloudflare's edge infrastructure.

## Known failure modes

- Unsupported audio format results in an error response
- Audio file too large or too long may cause timeout or rejection
- Missing or malformed multipart form-data causes 400 bad request
- Payment not authorized or x402 handshake fails results in 402 Payment Required
- Inaudible or silent audio may return empty or low-confidence transcript
- Network or Cloudflare Worker timeout on large files

## How this service works

Speech-to-text

## Output

Returns a text transcript of the spoken content in the uploaded audio file, produced by an AI speech-to-text model. Billed at $0.02 USDC per call via x402 protocol.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "file": {
   "type": "string",
   "format": "binary",
   "description": "Audio file (multipart form-data)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-ai-api-civicmerge-workers-dev-b78c4a7e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-ai-api.civicmerge.workers.dev](https://www.zero.xyz/host/x402-ai-api.civicmerge.workers.dev/llms.txt)