A single protocol for secure resource exchange. Credentials and payment in, resource out.
Client sends credentials and payment in a single encrypted request
Provider validates credentials and processes payment atomically
Resource returned in a single round trip, guaranteed or refunded
zk402 is our upcoming cryptographic library implementing zero-knowledge proofs for HTTP status 402 (Payment Required). It enables atomic, privacy-preserving resource exchange in a single round trip.
Prove credentials without revealing sensitive data
Native implementation of the HTTP 402 status code
Complete the entire exchange in a single request-response
Credentials, payment, and resource delivery happen in one atomic transaction. Either everything succeeds or nothing does.
Cryptographic verification at every step. No intermediaries, no trusted third parties, no assumptions.
Works with any blockchain, payment network, or settlement layer. Build once, deploy everywhere.
Zero-knowledge proofs for credentials. Only necessary information is revealed, nothing more.
Open source, permissionless, and ready to integrate