# GEDX402 ASR Nova-3 Speech-to-Text

> GEDX402 ASR Nova-3 Speech-to-Text is a paid API for AI agents from media.gedx402.com, paid per call via x402, $0.067/call, status unknown (last checked 2026-09-15).

Transcribes base64-encoded audio files to text using the Nova-3 ASR model, payable with USDC on multiple blockchains via x402 protocol

## Facts

- Endpoint: GET https://media.gedx402.com/v1/asr/nova-3
- Price: $0.067/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gedx402-asr-nova-3-speech-to-text-f2e91424
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XPwBfpJ4UG-a5Q-oFW2BM

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-asr-nova-3-speech-to-text-f2e91424
```

Example prompt: Transcribe this audio recording for me — here's the base64-encoded WAV: [base64 string]. Pay using USDC via x402.

## When to prefer this

Choose this endpoint when you need automatic speech recognition without managing API keys, and want to pay per-call with USDC on Base, Polygon, Arbitrum, World, or Solana. Particularly useful for agents operating in Web3 environments or when avoiding credential management overhead is important.

## Known failure modes

- Invalid or malformed base64 audio input returns an error
- Unsupported audio format may result in transcription failure
- Payment failure or insufficient USDC balance returns HTTP 402
- Network timeout for large audio files
- Empty or silent audio returns empty transcript

## How this service works

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

## Output

A JSON object with a 'text' field containing the transcribed speech as a plain-text 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-asr-nova-3-speech-to-text-f2e91424/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)