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

> Citiview Speech-to-Text Transcription (Whisper Large v3 Turbo) is a paid API for AI agents from agents.citiviewgroup.com, paid per call via x402, $0.011/call, status unknown (last checked 2026-10-14).

Transcribes audio or video files from a public URL or base64-encoded audio, returning the full transcript, detected language, timed segments, and WebVTT subtitles.

## Facts

- Endpoint: GET https://agents.citiviewgroup.com/v1/transcribe?utm_source=zero.xyz
- Price: $0.011/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/citiview-speech-to-text-transcription-whisper-large-v3-turbo-adc3a122
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W9CEGYNNokgdaTRzEwZVU

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 citiview-speech-to-text-transcription-whisper-large-v3-turbo-adc3a122
```

Example prompt: Can you transcribe this podcast episode for me? Here's the public MP3 URL: https://example.com/episode42.mp3 — I'd also like the WebVTT subtitles and timestamped segments.

## When to prefer this

Choose this endpoint when you need fast, accurate transcription with timestamps and WebVTT subtitles in a single call, especially when your source is a publicly accessible audio/video URL or base64 audio up to 20 MB. It is ideal for multilingual content since Whisper large-v3-turbo auto-detects language. Prefer it over raw Whisper integrations when you want an agent-ready, pay-per-call API with no setup.

## Known failure modes

- File exceeds 20 MB limit — returns an error indicating file too large
- URL is not publicly accessible or returns a non-200 response — returns a fetch/access error
- Unsupported audio/video format — only mp3, wav, m4a, ogg, webm, mp4 are supported
- base64 input is malformed or corrupt — returns a decoding error
- Language hint is an invalid ISO 639-1 code — may degrade detection accuracy or return an error
- Payment not provided or insufficient — returns 402 Payment Required

## 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. Priced by length: $0.002 + $0.0015 per minute of max_minutes (default 6, up to 30). Also callable as GET with the same fields as query parameters.

## Output

Returns the full transcript text, the detected spoken language code, an array of timed segments with start/end timestamps and text, and a WebVTT-formatted subtitle string suitable for embedding in video players.

## 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/citiview-speech-to-text-transcription-whisper-large-v3-turbo-adc3a122/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agents.citiviewgroup.com](https://www.zero.xyz/host/agents.citiviewgroup.com/llms.txt)