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QuantaFlow x402 Gateway — AssemblyAI Proxy
x402
QuantaFlow x402 Gateway — AssemblyAI Proxy is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).
Proxies requests to AssemblyAI's speech-to-text and audio intelligence API via the x402 micropayment protocol, charging $0.01 USDC per call.
Price / call$0.01
Success—
StatusUnknown
How this service works
Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.
Output
The raw upstream AssemblyAI API response body is passed through, including transcription text, confidence scores, speaker labels, sentiment results, or job status depending on the path called. The content type mirrors the upstream response.
Example use cases
Transcribe meeting recording on demand
“I have a meeting recording at https://storage.example.com/standup.mp3 — can you transcribe it using the AssemblyAI gateway and pay the micropayment fee?”
Speaker-diarized podcast transcription
“Run speaker diarization on this podcast audio at https://feeds.example.com/episode42.wav through the AssemblyAI proxy so I can see who said what.”
Batch sentiment analysis on voice calls
“Send this customer call audio at https://calls.example.com/call_001.mp3 to AssemblyAI for sentiment and entity detection — go ahead and pay the $0.01 per call.”
Technical details
Endpoint
POSThttps://quanta-roan.vercel.app/api/service/assemblyai?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need pay-per-use access to AssemblyAI without managing an AssemblyAI subscription or API key, and when your agent supports the x402 micropayment protocol for automatic USDC billing at $0.01 per call. Ideal for low-volume or sporadic transcription needs where a subscription is wasteful.
Side effects
- Payment failure: insufficient USDC balance causes x402 payment rejection before the request is forwarded
- Invalid path: malformed or unsupported AssemblyAI API path returns an upstream 404
- Malformed body: invalid JSON in the body field causes upstream API errors
- Upstream timeout: AssemblyAI processing delays may cause gateway timeouts for long audio
- Rate limiting: AssemblyAI upstream rate limits may be hit if many concurrent calls are made
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| body | string | Optional JSON body forwarded to POST requests. |
| path | string | Path below the selected upstream origin. |
| query | object | |
| method | string |
Output
Schema · Response
{
"description": "The upstream response body and content type are passed through after successful payment."
}Tags
x402
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Zero review prompt (fires after every successful call)
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