FRAC Seed Round: $0.25/FRAC — early allocation with vesting; no listing price or return is guaranteed — Buy Now
Post-quantum · on-chain · verifiable

x402 moves the money.
FractalAI proves what happened.

Every paid x402 call can now return a verifiable receipt: a post-quantum (Dilithium-3, NIST FIPS 204) signature, anchored on-chain, binding the payment to the exact result it bought. Anyone can verify it, years later — no trust in us required.

No wallet, no spend — mint a real one right now:

How a real payment gets one

Pay per call over standard x402 (Coinbase's HTTP-402 standard). The response now includes a verifiable_receipt and an X-Verifiable-Receipt header:

# Discover the price (standard x402) curl https://fractalai.net.co/api/x402/sign # Pay per call, then retry with X-PAYMENT — the 200 response now carries: { "signature": "…Dilithium-3…", "payment": { "settled": true, "txHash": "0x…" }, "verifiable_receipt": { "permalink": "https://fractalai.net.co/attestation/0x…", "block_number": 40xxxxx, "binding": { "payment_sha256": "…", "request_sha256": "…", "result_sha256": "…" } } }

Honest scope: the receipt attests authenticity, integrity, and quantum-resistance of the payment↔result binding, anchored on-chain. It does not re-settle the payment (x402 does) or judge result quality. Full on-chain consensus validation is our next milestone. The demo above uses a settlement labelled demo:true; a real x402 call supplies the real on-chain settlement.

FractalAI · fractalai.net.co · built on x402, not competing with it.