r402-core

Core types, traits, and wire formats for the x402 payment protocol.

This crate is blockchain-agnostic. It defines the shared data model used by client, server, and facilitator implementations across every chain. Chain specific behavior lives in sibling crates (r402-evm, r402-solana, r402-tron, r402-casper).

Modules

• [wire] — On-the-wire JSON types (offer, facilitator RPC, codecs) and settlement overrides
• [facilitator] — Facilitator trait, DynFacilitator erasure, verify/settle hooks
• [scheme] — Payment scheme registry and builder traits
• [extensions] — Extension framework for x402 protocol extensions
• [client] — PaymentClient orchestration
• [resource_server] — Transport-agnostic verify → execute → settle
• [chain] — CAIP-2 chain identifiers, address, provider abstractions
• [amount] — Human-readable currency amount parsing ("$0.01" etc.)
• [error] — Layered errors and machine-readable [ErrorReason] wire codes

Feature Flags

License

Licensed under either of MIT or Apache-2.0, at your option.