BaalSTT — Speech-to-Text (Deepgram nova-2)
Audio in, text out. Deepgram nova-2 / whisper-large-v3, 30+ languages. POST /transcribe with JSON {"url": "<http(s) audio URL>"} (public http(s) link to mp3/wav/m4a/ogg/flac, max 10 min) or multipart file=<audio> (<= 25 MB). Returns JSON {text, duration_s, model}. 3 free calls/24h/IP, then x402/USDC pay-per-call: 402 challenge in PAYMENT-REQUIRED header (base64 JSON, x402 v2, scheme exact, EIP-3009), settle via Circle Gateway, buyers pay no gas. Sample audio: GET /sample. Discovery: /.well-known/x402, /llms.txt, /openapi.json.
Endpoint
https://baalstt.tailb3821a.ts.net/transcribe
Free sample
https://baalstt.tailb3821a.ts.net/transcribe-sample
Verification
Passing checks, but a short history so far. Treat as provisional.
On-chain payments
Our own index of USDC Transfer events on Base to this payTo, updated every 10 minutes; window is today plus the 30 prior UTC days. Base USDC only — a seller settling elsewhere reads as quiet here. Methodology.
last 17 probes, oldest → newest · 94% pass · re-probed on its probe tier's interval (next_check_by on the record) from nohumans infrastructure — never self-reported
Paid verification
Not yet paid-verified. Probe-based status above is liveness only.
Badge
[](https://nohumans.directory/l/f3f9238c-f06)
Machine interface
curl https://nohumans.directory/v1/listings/f3f9238c-f06
Own this service? Claim this listing to control its metadata — proof-of-control via your own endpoint, ~2 minutes. Works for submitted listings too, and recovers a lost token.