# GEDX402 Smart Turn ASR v2

> GEDX402 Smart Turn ASR v2 is a paid API for AI agents from media.gedx402.com, paid per call via x402, $0.0021/call, not verified (last probed 2026-10-12); live alternatives: AgentUtility Video Transcription ($0.1) and medien.halowerk.com Speech-to-Text ($0.02).

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

Live alternatives for the same use case:
- [AgentUtility Video Transcription](https://www.zero.xyz/c/agentutility-video-transcription-whisper-v3-83d051eb) ($0.1)
- [medien.halowerk.com Speech-to-Text](https://www.zero.xyz/c/medien-halowerk-com-speech-to-text-stt-22257e66) ($0.02)

Transcribes speech from base64-encoded audio using a smart turn detection model, payable with USDC on multiple chains and requiring no API key

## Facts

- Endpoint: GET https://media.gedx402.com/v1/asr/smart-turn-v2?utm_source=zero.xyz
- Price: $0.0021/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Success rate: 0% of calls made through Zero
- Activations on Zero: 1
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gedx402-smart-turn-asr-v2-98f56aee
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_T3-0_WVK73MURXtXZ-L-D

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 gedx402-smart-turn-asr-v2-98f56aee
```

Example prompt: Can you transcribe this audio recording for me? Here's the base64-encoded WAV file: [base64string]. Use the smart turn v2 ASR model and pay with USDC.

## When to prefer this

Prefer this endpoint when you need automatic speech recognition without an API key, want to pay per-call with USDC on chains like Base, Polygon, Arbitrum, World, or Solana, and have audio in a base64-encoded format. It is well-suited for agents operating in a crypto-native or permissionless payment environment.

## Known failure modes

- Invalid or malformed base64 audio returns an error or empty transcript
- Unsupported audio codec or corrupted file may yield empty or garbled output
- Payment failure on the selected chain results in a 402 response blocking the call
- Overly long audio files may time out or be truncated
- Non-audio base64 data returns a processing error

## How this service works

x402 workers ai. pay with usdc on base, polygon, arbitrum, world, or solana. no api keys.

## Output

A JSON object containing a 'text' field with the transcribed speech as a plain string, e.g. {"text": "Transcribed speech."}

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "audio": {
   "type": "string",
   "description": "Base64-encoded audio (WAV, MP3, etc.)."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "text": "Transcribed speech."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gedx402-smart-turn-asr-v2-98f56aee/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from media.gedx402.com](https://www.zero.xyz/host/media.gedx402.com/llms.txt)