# Speech to text API

Transcribe speech from an audio file at a public URL, or uploaded in a POST body, using Whisper large-v3-turbo. Returns the transcript text, detected language, duration and word count; subtitles=srt or vtt adds subtitle text and timestamps=true adds timed segments and words. Accepts common formats such as MP3, WAV, M4A and OGG up to 5 MB, in 90+ languages. Use for voice notes, podcast clips, meeting snippets, subtitles and voice messages.

Speech to text API, by monthly plan or one-off packs with one API key: https://glyphcall.com/speech-to-text-api

## When an agent wants this

- Transcribe voice notes, podcast clips, meeting snippets and voice messages
- Get the transcript, detected language, duration and word count

## Speech to text, transcribe audio: Whisper transcription of an audio file

Speech to text, transcribe audio: Whisper transcription of an audio file. $0.01 per successful call; failed calls are never charged.

Transcribe speech from an audio file at a public URL, or uploaded in a POST body, using Whisper large-v3-turbo. Returns the transcript text, detected language, duration and word count; subtitles=srt or vtt adds subtitle text and timestamps=true adds timed segments and words. Accepts common formats such as MP3, WAV, M4A and OGG up to 5 MB, in 90+ languages. Use for voice notes, podcast clips, meeting snippets, subtitles and voice messages.

Inputs: url (required): Absolute http(s) URL of an audio file (max 5 MB); or POST the file itself (raw body, multipart `file` part, or base64 in JSON); subtitles: srt or vtt: also return subtitle text; timestamps: true: also return timed segments and words; language: Spoken language code such as en, sv or de (default: detected).

Not in the free calls (it costs us capacity per call); pay from the first call.

With a card key from https://glyphcall.com/credits, in a header or, when your client can only fetch a URL, in the URL:

    curl -H "Authorization: Bearer adt_…" "https://glyphcall.com/transcribe?url=https%3A%2F%2Fcommons.wikimedia.org%2Fwiki%2FSpecial%3AFilePath%2FEn-us-hello.ogg"
    curl "https://glyphcall.com/transcribe?url=https%3A%2F%2Fcommons.wikimedia.org%2Fwiki%2FSpecial%3AFilePath%2FEn-us-hello.ogg&api_key=adt_…"

Without a key the same URL answers 402 with x402 and MPP terms, so a wallet client pays USDC per call and retries. Over MCP (https://glyphcall.com/mcp) this tool is transcribe.

Example result:

    {
      "url": "https://commons.wikimedia.org/wiki/Special:FilePath/En-us-hello.ogg",
      "text": "Hello!",
      "language": "en",
      "durationSeconds": 0.487625,
      "wordCount": 1,
      "model": "@cf/openai/whisper-large-v3-turbo"
    }

Tool page: https://glyphcall.com/tools/transcribe

## Questions

Docs for agents: https://glyphcall.com/llms.txt · OpenAPI: https://glyphcall.com/openapi.json · All guides: https://glyphcall.com/guides