x402-signature-service

signx402.com

Send one PDF to one email recipient for simple electronic signature: the service emails the signer, tracks completion and returns the signed PDF — giving AI agents a way to get human sign-off on contracts and NDAs. $0.50 USDC per request (x402 exact scheme on Base), poll a status URL with a one-time bearer token, download the signed document. SSRF-guarded fetching, tokens stored as hashes, emails masked in logs.