Signature

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.

fractalai.net.co Crypto & Payments 16 calls / 30d checked 2026-11-01

0.02 USDC per call per call

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...

fractalai.net.co Crypto & Payments 17 calls / 30d checked 2026-11-01

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

saylorinnovations.com AI Models & Inference 4 calls / 30d checked 2026-11-01

0.01 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.

api.anchor-x402.com Crypto & Payments 3 calls / 30d checked 2026-11-01

0.01 USDC per call per call

Ed25519 Receipt Verification x402 REST checked

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,...

www.mahastrategies.com Data & Finance 2 calls / 30d checked 2026-10-28

0.0125 USDC per call per call checked

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...

agent402.tools Databases & Storage 11 calls / 30d checked 2026-11-01

0.002 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.

webtools402.176-109-107-191.sslip.io Data & Finance 7 calls / 30d checked 2026-11-01

0.003 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...

x402-store.dgdb.workers.dev AI Models & Inference 3 calls / 30d checked 2026-11-01

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...

agent402.tools Other services 13 calls / 30d checked 2026-11-01

0.001 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.

api.vextorium.com Crypto & Payments 4 calls / 30d checked 2026-10-28

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.

api.vextorium.com Crypto & Payments 4 calls / 30d checked 2026-10-28

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...

api.vextorium.com Crypto & Payments 2 calls / 30d checked 2026-11-01

0.005 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,...

agent402.tools Comms & Messaging 9 calls / 30d checked 2026-11-01

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...

workbot1.oddsys.org Crypto & Payments 2 calls / 30d checked 2026-11-01

0.002 USDC per call per call

attest-verify x402 REST

Verify an attestation produced by /notarize (either the EIP-712 or the EAS off-chain form) — pure compute, no network and no keys. Recovers the signer and reports whether it matches this service's attestor, whether the E...

payai.agentstools.dev Other services checked 2026-10-29

0.001 USDC per call per call

txsafety-signature x402 REST

Pre-sign safety verdict for an off-chain EIP-712 signature (EIP-2612, Permit2, EIP-3009). Decodes what it authorizes (spender, token, amount, deadline), checks domain-spoof, approval-hygiene and scam-blocklist, returns a...

payai.agentstools.dev Security checked 2026-10-29

0.02 USDC per call per call

crypto-verify x402 REST

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.

payai.agentstools.dev Data & Finance checked 2026-10-29

0.003 USDC per call per call

evm-decode-signature x402 REST

Reverse a 4-byte function selector, an event topic hash, or raw calldata into its human-readable signature using the 4byte database, with collisions resolved so the real signature (the oldest registered) is returned firs...

payai.agentstools.dev Dev & Code checked 2026-10-29

0.003 USDC per call per call