Crate x402_rs

Rust implementation of the x402 protocol.

This crate provides the core data structures and logic for working with the x402 protocol, including a reference facilitator implementation for on-chain verification and settlement.

It is designed for reuse across all x402 roles:

• Facilitator: a server that verifies and settles x402 payments (see facilitator and facilitator_local)
• Seller: a payment-gated service that consumes shared types from types
• Buyer: a client that constructs and submits x402-compliant payments

Modules:

• facilitator — defines the facilitator::Facilitator trait used to validate and settle x402 payments.
• facilitator_local — a concrete implementation of facilitator::Facilitator.
• network — enumerates supported Ethereum-compatible networks and known token deployments.
• provider_cache — dynamic initialization and caching of Ethereum JSON-RPC providers.
• telemetry — OpenTelemetry instrumentation setup for tracing and observability.
• types — all shared x402 protocol structures and payload formats.

Modules

facilitator

Core trait defining the verification and settlement interface for x402 facilitators.

facilitator_local

Facilitator implementation for x402 payments using on-chain verification and settlement.

network

Network definitions and known token deployments.

provider_cache

Ethereum provider cache and initialization logic.

telemetry

types

Type definitions for the x402 protocol.