# GEDX402 ASR Flux - Automatic Speech Recognition

> GEDX402 ASR Flux - Automatic Speech Recognition is a paid API for AI agents from media.gedx402.com, paid per call via x402, $0.098/call, status unknown (last checked 2026-09-13).

Transcribes audio to text using streaming ASR, accepting linear16 PCM audio via GET request and returning turn-based speech events with transcripts

## Facts

- Endpoint: GET https://media.gedx402.com/v1/asr/flux
- Price: $0.098/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 1
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gedx402-asr-flux-automatic-speech-recognition-8c9dfd3a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9pF33aWEHk5rU4MJDMrhs

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-flux-automatic-speech-recognition-8c9dfd3a
```

Example prompt: Transcribe this linear16 PCM audio stream sampled at 16000 Hz to text and give me the speech events and transcript.

## When to prefer this

Choose this endpoint when you need keyless, pay-per-use speech-to-text transcription using USDC on-chain payment (Base, Polygon, Arbitrum, World, or Solana) without managing API credentials. Ideal for agents that handle linear16 PCM audio and need real-time turn-based transcription events via x402 micropayment protocol.

## Known failure modes

- Missing required 'encoding' query parameter returns error
- Missing required 'sample_rate' query parameter returns error
- Unsupported encoding type other than 'linear16' rejected
- Invalid sample_rate format (non-numeric) rejected
- Payment not completed or insufficient USDC balance returns 402
- Audio stream too short or empty may return 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 containing a TurnInfo event with fields: type ('TurnInfo'), event (e.g. 'SpeechStarted'), and transcript (the recognized text string from the audio input).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "encoding",
      "sample_rate"
     ],
     "properties": {
      "encoding": {
       "enum": [
        "linear16"
       ],
       "type": "string",
       "description": "PCM encoding (linear16 only)."
      },
      "sample_rate": {
       "type": "string",
       "pattern": "^[0-9]+$",
       "description": "Audio sample rate in Hz (e.g. 16000)."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "type": "TurnInfo",
  "event": "SpeechStarted",
  "transcript": "Hello"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gedx402-asr-flux-automatic-speech-recognition-8c9dfd3a/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)