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Onchain Router Speech-to-Text Transcription
x402
Onchain Router Speech-to-Text Transcription is a paid API for AI agents from onchainrouter.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Transcribes audio to text using the ElevenLabs Scribe v2 model, accepting Base64-encoded audio and returning the transcribed text with usage metadata
Price / call$0.002
Success—
StatusUnknown
How this service works
Give agents provider-neutral access to text, image, and speech models with USDC payments on Base, local spending controls, ambiguity-safe recovery, and verified receipts. Stable public npm clients and MIT agent integrations are available now.
Output
Returns a JSON object containing a transcription ID, the full transcribed text string, the model used (elevenlabs/scribe-v2), and usage metadata including the duration of the input audio in milliseconds. Optionally returns verbose JSON with additional detail.
Example use cases
Voice memo to written notes
“I recorded a voice memo of my meeting notes — can you transcribe the audio into text? Here's the Base64-encoded file, use ElevenLabs Scribe v2 and give me the verbose JSON output.”
Podcast interview transcription
“I have a podcast interview I need transcribed. I'll give you the audio as a Base64 string — please transcribe it using Scribe v2 and return the full text.”
Multilingual speech transcription
“Can you transcribe this audio clip I recorded? It's already Base64-encoded. Use the ElevenLabs Scribe v2 model and return a JSON response with the transcribed text.”
Technical details
Endpoint
POSThttps://onchainrouter.dev/v1/audio/transcriptionsWhen to prefer
Choose this endpoint when you need affordable, high-quality speech-to-text transcription powered by ElevenLabs Scribe v2 and want to pay per-call via USDC on-chain with no subscription. Ideal for agents operating autonomously that need programmatic audio transcription without managing API keys for ElevenLabs directly. The 0% service fee launch promotion makes it cost-competitive for high-volume transcription workloads.
Side effects
- Audio Base64 string too short (<4 chars) or too long (>34MB encoded) returns a validation error
- Invalid or unsupported audio format may result in poor or empty transcription
- Malformed Base64 (with data-URL prefix or whitespace) will likely cause a decode error
- Network or payment failure (x402 protocol) prevents the request from completing
- Model not found or unavailable returns an error if enum value is incorrect
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| model | string | |
| file_format | string | |
| audio_base64 | string | Canonical RFC 4648 Base64 audio without a data-URL prefix or whitespace. |
| response_format | string |
Output
Schema · Response
{
"type": "json",
"example": {
"id": "trns_example",
"text": "Transcribed speech.",
"model": "elevenlabs/scribe-v2",
"usage": {
"input_audio_ms": 3100
}
}
}Tags
x402
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