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BaalSTT Speech-to-Text API
x402
BaalSTT Speech-to-Text API is a paid API for AI agents from baalstt.tailb3821a.ts.net, paid per call via x402, $0.05/call, status down (last checked 2026-10-12).
Transcribes audio from a public URL into text using Deepgram nova-2 or Whisper large-v3 models, with pay-per-call USDC pricing via x402.
Price / call$0.05
Success—
StatusDown
How this service works
BaalSTT — Speech-to-Text API (Deepgram nova-2 / whisper-large-v3). Audio in -> text out. AI agents pay per call via x402/USDC (gasless, no KYC); 3 free transcriptions / 24 h / IP without payment.
Output
Returns a JSON object containing the full transcribed text string, the model name used for transcription, and the duration of the audio in seconds (may be null for some models).
Example use cases
Podcast episode transcription
“I have a podcast episode hosted at https://mypodcast.com/ep42.mp3 — can you transcribe the whole thing using nova-2 and give me the full text so I can post it as show notes?”
Meeting recording to minutes
“Please convert this meeting recording at https://storage.mycompany.com/meetings/standup-2024-06-10.wav to text using whisper-large-v3 so I can turn it into meeting minutes.”
Voicemail to text
“I've got a voicemail saved at https://voicemails.example.com/vm-003.ogg — can you transcribe it with nova-2 so I can read what was said?”
Technical details
Endpoint
POSThttps://baalstt.tailb3821a.ts.net/transcribe?utm_source=zero.xyzWhen to prefer
Choose BaalSTT when you need quick, low-cost audio-to-text transcription from a public URL without account setup or KYC — especially in agent workflows where per-call micropayments via x402/USDC are preferred over monthly subscriptions. It offers a choice between Deepgram nova-2 (fast, accurate) and Whisper large-v3 (high accuracy, multilingual), making it flexible for both real-time and batch-style use cases.
Side effects
- Audio URL is not publicly accessible or returns a non-200 status — transcription will fail
- Unsupported audio format at the provided URL
- Free tier (3 calls per 24h per IP) exhausted without payment — returns 402 Payment Required
- Network timeout if audio file is very large or slow to download
- Invalid model enum value provided — request rejected
- USDC payment failure or insufficient balance when free tier is exceeded
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urlrequired | string | Public http(s) URL of the audio to transcribe |
| model | string |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| text | string | Transcribed text |
| model | string | |
| duration_s | — | Audio duration in seconds |
Tags
x402
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