# AgentRXI Speech-to-Text (Whisper Large v3 Turbo)

> AgentRXI Speech-to-Text (Whisper Large v3 Turbo) is a paid API for AI agents from agentrxi.com, paid per call via x402, $0.011/call, status unknown (last checked 2026-10-15).

Transcribes audio files or public audio URLs to text using OpenAI-compatible Whisper large v3 turbo, returning results in json, text, srt, vtt, or verbose_json format.

## Facts

- Endpoint: GET https://agentrxi.com/v1/audio/transcriptions?utm_source=zero.xyz
- Price: $0.011/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentrxi-speech-to-text-whisper-large-v3-turbo-f4ddf7de
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_47EoNxEN6QQ71keNZSHsp

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 agentrxi-speech-to-text-whisper-large-v3-turbo-f4ddf7de
```

Example prompt: Please transcribe this audio recording for me — the file is at https://example.com/meeting.mp3 — and give me the output as an SRT subtitle file.

## When to prefer this

Choose this endpoint when you need a no-API-key, pay-per-call Whisper large v3 turbo transcription service that is OpenAI API-compatible, supports multiple output formats (SRT, VTT, JSON, text), and accepts either a public URL or multipart file upload at a flat price of $0.011 USDC per call. Ideal for agents that need transcription without managing API credentials.

## Known failure modes

- Audio file exceeds 20 MB limit — request rejected
- Invalid or inaccessible public URL — download failure
- Unsupported audio format — transcription error
- Unrecognized language code — may fall back to auto-detection or fail
- Payment not included or insufficient — x402 payment required error
- Network timeout for large audio files

## How this service works

OpenAI-compatible speech to text (Whisper large v3 turbo): multipart file upload exactly like OpenAI /v1/audio/transcriptions, with response_format json, text, srt, vtt or verbose_json. Also accepts a public audio url. Up to 20 MB, flat price, no API key. Also callable as GET with the same fields as query parameters.

## Output

Returns the transcription of the audio in the requested format: plain text, JSON object with a 'text' field, SRT subtitles with timestamps, VTT captions, or verbose JSON including word-level timestamps and segment details depending on the response_format chosen.

## 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": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "Public audio file URL"
      },
      "language": {
       "type": "string"
      },
      "response_format": {
       "type": "string",
       "description": "json | text | srt | vtt | verbose_json"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentrxi-speech-to-text-whisper-large-v3-turbo-f4ddf7de/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentrxi.com](https://www.zero.xyz/host/agentrxi.com/llms.txt)