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ZeroClick Speech-to-Text Transcription (whisper-tiny)
ZeroClick Speech-to-Text Transcription (whisper-tiny) is a paid API for AI agents from agents.zerogpu.ai, paid per call via MPP, price unknown, status unknown (last checked 2026-10-16).
Transcribes audio to text in its source language using whisper-tiny, authenticated via HMAC signature, billed per audio second.
Price / call—
Success—
StatusUnknown
How this service works
OpenAI-style speech-to-text in the source language. The model is the configured `whisper-tiny` rather than one read from the request. Billed per audio second: the allowance check asks for the 1-second floor, and `zc-usage` reports `max(1, ceil(x-audio-duration-seconds))` audio seconds on success. Authenticated by verifying the `zc-signature` HMAC over the raw request bytes; the same orchestration as `/v1/audio/transcriptions` runs behind it. **Body**: `application/json` — the form ZeroClick's pay host forwards — with the audio as base64 (`file`) or an https URL (`file_url`), or `multipart/form-data` with a `file` part. A JSON body is converted to the multipart upload before dispatch; one that cannot be (bad base64, unreachable URL, neither or both sources) is answered with `400` or `413` before any inference and is not billed.
Output
Returns a JSON object with a `text` field containing the transcript. With `verbose_json`, also includes `task`, `language`, `duration`, and `segments` and/or `words` arrays with timing data. With `text`, `srt`, or `vtt` response formats, returns plain text or subtitle file content accordingly.
Example use cases
Podcast interview transcription
“I have an MP3 of a 30-minute podcast interview at https://example.com/audio/interview.mp3 — can you transcribe the whole thing and give me a text transcript I can edit?”
Meeting notes from voice recording
“Here's a base64-encoded WAV of our team meeting. Can you transcribe it and give me the output with word-level timestamps so I can sync it with the video?”
Subtitle generation for video content
“I need SRT subtitles for this audio file at https://cdn.example.com/episodes/ep42.mp3 — the language is French, can you transcribe it and return the result in SRT format?”
Technical details
Endpoint
POSThttps://agents.zerogpu.ai/zeroclick/v1/audio/transcriptions?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need OpenAI-compatible speech-to-text with ZeroClick HMAC authentication, pay-per-second billing starting at 1 second, and whisper-tiny specifically. Prefer this over standard /v1/audio/transcriptions when operating within a ZeroClick-orchestrated agent flow where the HMAC signature is already being generated by the pay host. Use file_url for audio larger than 5.6 MB to avoid base64 body size limits.
Side effects
- 400 Bad Request: bad base64, unreachable URL, or both/neither file sources provided — not billed
- 413 Payload Too Large: audio exceeds ~5.6 MB for base64 JSON body or 25 MB for URL download
- 402 Payment Required: insufficient credit balance to cover even the 1-second floor
- HMAC signature verification failure: request rejected if zc-signature header is missing or invalid
- URL download timeout: 30-second timeout or more than 3 redirects causes failure
- Non-https URL rejected at any redirect hop
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| file | string | The audio, base64-encoded, or as a `data:` URL (`data:audio/mpeg;base64,…`). URL-safe base64 is accepted. Limited by ZeroClick's request body cap (about 7.5 MB of JSON, so about 5.6 MB of audio); use `file_url` for anything larger. |
| model | string | Model identifier. The endpoint serves `whisper-tiny`. |
| prompt | string | Text to guide spelling and style, such as names or jargon. |
| file_url | string | An https URL to the audio. Downloaded by ZeroGPU before transcription: https only (also at every redirect, at most 3), 30-second timeout, up to 25 MB. |
| filename | string | Name to give the uploaded file. Defaults to the last segment of `file_url`, or `audio.<ext>` from the audio's type. |
| language | string | ISO-639-1 code, such as `en`. Detected automatically when omitted. |
| temperature | number | Sampling temperature. |
| response_format | string | `json` and `verbose_json` return `application/json`; `text`, `srt`, and `vtt` return `text/plain`. |
| timestamp_granularities | array | `segment` (default), `word`, or both. Requires `verbose_json`. The form-field name `timestamp_granularities[]` is accepted too. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| textrequired | string | The transcript. |
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