# Gambit Whisper Audio Transcription (x402/USDC)

> Gambit Whisper Audio Transcription (x402/USDC) is a paid API for AI agents from gambit.barrioenergy.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).

Transcribes audio files to text using OpenAI Whisper large-v3, payable per-call via x402 USDC on Base at $0.03

## Facts

- Endpoint: POST https://gambit.barrioenergy.com/x402/transcribe
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 2
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gambit-whisper-audio-transcription-x402-usdc-df6d3f0e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_35wurm0KZbzSBLKSrlCps

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 gambit-whisper-audio-transcription-x402-usdc-df6d3f0e -d '<json body>'
```

Example prompt: Can you transcribe this audio file for me? Here's the URL: https://example.com/meeting-recording.mp3 — I need the full spoken text from it.

## When to prefer this

Choose this endpoint when you need pay-per-call audio transcription without an API subscription, especially in agent or bot workflows that can pay $0.03 USDC per call via the x402 protocol on Base. It is ideal for crypto-native pipelines or AI agents that handle micropayments natively. Prefer this over hosted STT services when you want no monthly commitment and automatic per-inference billing settled on-chain.

## Known failure modes

- Unsupported audio format — only mpeg/wav/ogg/webm/mp4 are accepted
- Unreachable audio URL — endpoint cannot fetch the file at the given http(s) URL
- Payment failure — x402 USDC payment on Base not completed or insufficient balance
- File too large — oversized audio may be rejected or time out
- Empty or silent audio — may return empty text string
- Network timeout — large audio files may exceed processing time limits

## How this service works

Gambit GPU shop. Humans: /signup ($1 credit), X-API-Key on /v1/*, QR Lightning top-up. Bots: L402 Lightning (LIVE) on /l402/*, x402 USDC on Base on /x402/*, or POST /v1/register ($0) then POST /v1/topup/lightning. Handwritten letter POST /x402/letter at $25.00 USDC. Funnel https://gambit.barrioenergy.com. Free probe GET|POST /x402/models.

## Output

Returns a JSON object containing the transcribed text (the full spoken content of the audio), the model used (whisper-large-v3), and the SKU (whisper-stt). Example: {"sku":"whisper-stt","text":"ask not what your country can do for you","model":"whisper-large-v3"}

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "audio_url": {
   "type": "string",
   "description": "http(s) URL of audio (mpeg/wav/ogg/webm/mp4). Multipart field file also accepted."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sku": "whisper-stt",
  "text": "ask not what your country can do for you",
  "model": "whisper-large-v3"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gambit-whisper-audio-transcription-x402-usdc-df6d3f0e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gambit.barrioenergy.com](https://www.zero.xyz/host/gambit.barrioenergy.com/llms.txt)