FractalAI Pay-per-Proof
Pay-per-Proof: one post-quantum ML-DSA-65 / Dilithium-3 (NIST FIPS 204) signature over your message/hash, x402-native.
Go to this service →Our latest check (2026-10-11)
- Answering
- Yes — valid x402 payment terms
- Time to answer
- 728 ms
- Price
- $0.020 per call
- Paying buyers, last 30 days
- 4 (directory's own records)
- Paid calls, last 30 days
- 11
- Category
- Payments and on-ramps
- Address
- https://fractalai.net.co/api/x402/sign
Accuracy
Accuracy scores are published once a seller has enough paid checks against an independent record (at least 7 scored answers over at least 7 days). Until then no score is shown, and a missing score is never a pass.
For agents
This page as JSON: /sellers/3b5ef13c523d.json. Paid lookup by address: GET /api/seller?resource=… ($0.001, x402).