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

> AgentRXI Speech-to-Text Transcription (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 or video files via Whisper large v3 turbo, returning transcript text, detected language, timed segments, and WebVTT subtitles from a public URL or base64-encoded audio.

## Facts

- Endpoint: GET https://agentrxi.com/v1/transcribe?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-transcription-whisper-large-v3-turbo-dcab663a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xjVyDL0_1bUk-19l5IQxP

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-transcription-whisper-large-v3-turbo-dcab663a
```

Example prompt: Can you transcribe this podcast episode for me? The audio file is at https://example.com/episode42.mp3 — I need the full transcript, the timed segments, and WebVTT subtitles.

## When to prefer this

Choose this endpoint when you need fast, high-quality transcription with timed segments and WebVTT subtitle output in a single call, especially for pay-per-use scenarios via x402 micropayment without managing API keys. Ideal for agents handling public media URLs or base64 audio up to 20 MB with per-minute pricing and support for up to 30 minutes of audio.

## Known failure modes

- Audio/video URL is not publicly accessible (returns error)
- File exceeds 20 MB size limit
- Audio format not supported (only mp3, wav, m4a, ogg, webm, mp4 are accepted)
- max_minutes cap exceeded leading to truncated transcript
- Poor audio quality resulting in inaccurate transcription
- Invalid base64 encoding if using audio_base64 input
- Network timeout fetching remote URL

## How this service works

Speech to text (Whisper large v3 turbo). Send a public audio/video URL or base64 audio (max 20 MB); get the transcript, detected language, timed segments and WebVTT subtitles. Also callable as GET with the same fields as query parameters.

## Output

Returns a transcript of the spoken content, the auto-detected language code, a list of timed segments (each with start/end timestamps and text), and a WebVTT subtitle file — all derived from the submitted audio or video source.

## 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",
     "properties": {
      "url": {
       "type": "string",
       "description": "Public URL of an audio or video file (mp3, wav, m4a, ogg, webm, mp4)"
      },
      "language": {
       "type": "string",
       "description": "Optional ISO 639-1 hint, e.g. en"
      },
      "audio_base64": {
       "type": "string",
       "description": "Alternative to url: base64 audio bytes"
      }
     }
    }
   },
   "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-transcription-whisper-large-v3-turbo-dcab663a/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)