FractalAI Pay-per-Proof x402 REST usage
Pay-per-Proof: one post-quantum ML-DSA-65 / Dilithium-3 (NIST FIPS 204) signature over your message/hash, x402-native.
0.02 USDC per call
per call
Signature
14 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
FractalAI Verify x402 REST usage
Pay-per-Verify: an agent pays $0.01 to verify a post-quantum (ML-DSA-65 / Dilithium-3 or Dilithium-2, NIST FIPS 204; scheme auto-detected by size) signature over a message against a public key. A generic machine-to-machi...
0.01 USDC per call
per call
Saylor Innovations Guide Library x402 REST usage
CUDA, driver and Ollama compatibility - GPU support, model memory fit and proof inference uses the GPU
0.01 USDC per call
per call
Ed25519 Receipt Verification x402 REST usage
Verify one Ed25519 signature over up to 8,000 characters of exact UTF-8 receipt text using a supplied 32-byte public key. Returns cryptographic validity and message hash. Does not establish issuer identity, trusted time,...
0.0125 USDC per call
per call
crypto-verify x402 REST usage
Verify an EIP-191 personal_sign or EIP-712 typed-data signature and recover the signer address from public inputs (message + signature). Verification/recovery only — never signs.
0.003 USDC per call
per call
Attest x402 REST usage
Attest a decision: sign (input_hash, output_hash, decision) yourself, or omit the signature and the treasury signs — then dual-chain anchor. Free re-verify at /v1/attest/verify. $0.01 USDC.
0.01 USDC per call
per call
Function selector / event topic x402 REST usage
Resolve a 4-byte function selector or a 32-byte event topic hash to its known human-readable Solidity signatures, via the openchain.xyz signature database with 4byte.directory as fallback. Unknown selectors return {found...
0.002 USDC per call
per call
what-am-i-signing x402 REST usage
Decode an EVM signature request (EIP-712 typed data, Permit/Permit2, or ERC-20 approve calldata) into a structured intent: what token, which spender, how much, until when, plus risk_flags and an action_hint. Deterministi...
0.005 USDC per call
per call
Verify an Ethereum signature x402 REST usage
Verify an Ethereum signature: a personal_sign (EIP-191) message or EIP-712 typed data. Recovers the signer address and, if you pass one, confirms it matches. Local computation; EIP-1271 contract wallets are not covered.
0.003 USDC per call
per call
Verify a Solana signature x402 REST usage
Verify an Ed25519 Solana signature (Phantom/Solflare signMessage) for a message and public key; signature in base58, base64 or hex. Local computation.
0.003 USDC per call
per call
Signature reviewer | Vextorium x402 REST usage
Explain an EIP-712 typed-data signature before signing it: x402/EIP-3009 payment authorizations, EIP-2612 permits, Permit2 and Seaport orders. Flags unlimited allowances, long validity and non-official tokens, and return...
0.005 USDC per call
per call
GCD + LCM x402 REST usage
Greatest common divisor and least common multiple of two or more integers, computed exactly (arbitrary precision). Useful for cycle alignment, scheduling periods and fraction work. Signs are ignored; a zero makes the LCM...
0.001 USDC per call
per call
Webhook signature verify x402 REST usage
Verify a webhook's HMAC signature against the correct per-provider scheme: GitHub (X-Hub-Signature-256, sha256=hex), Stripe (Stripe-Signature t/v1 over "<t>.<body>" with replay tolerance), Shopify (X-Shopify-Hmac-Sha256,...
0.001 USDC per call
per call
Busker Signature Verifier x402 REST usage
Verify EVM signatures offline: EIP-191 personal messages, EIP-712 typed data, and x402/EIP-3009 payment authorizations (paste a raw Payment-Signature header) — recovers the signing wallet, checks it against an expected a...
0.002 USDC per call
per call