r402 0.15.0

x402 Payment Protocol SDK for Rust — umbrella crate.
Documentation

r402

x402 Payment Protocol SDK for Rust — umbrella crate.

This crate re-exports the workspace under feature flags. Prefer depending on individual crates when you need a minimal dependency graph.

Included crates

Feature Crate Role
(always) r402-core Wire types, Facilitator, schemes, hooks, extensions
evm (default) r402-evm EVM exact + upto (ERC-3009 / Permit2)
svm r402-svm Solana exact (SPL Token / Token-2022)
tron r402-tron Tron exact (TIP-712 / EIP-3009 + Permit2)
casper r402-casper Casper exact (CEP-18, remote facilitator)
http (default) r402-http Axum middleware + reqwest client
mcp r402-mcp MCP transport on official rmcp (V2)

Forwarding features: client, server, facilitator, telemetry, cache, ext-bazaar, ext-payment-id, all-extensions, full.

Quick Start

[dependencies]
# Minimal EVM HTTP server/client
r402 = { version = "0.15", features = ["evm", "http", "client", "server", "facilitator"] }

# Multi-chain
r402 = { version = "0.15", features = [
  "evm", "svm", "tron", "casper",
  "http", "client", "server", "facilitator",
] }

// After enabling the matching features:
use r402::evm;    // r402-evm
use r402::svm;    // r402-svm
use r402::tron;   // r402-tron
use r402::casper; // r402-casper
use r402::http;   // r402-http
use r402::mcp;    // r402-mcp (needs feature "mcp")

Features

Flag Default What it enables
evm yes Re-export r402-evm as [evm]
svm Re-export r402-svm as [svm]
tron Re-export r402-tron as [tron]
casper Re-export r402-casper as [casper]
http yes Re-export r402-http as [http]
mcp Re-export r402-mcp as [mcp]
client Forward client to enabled chain + http crates
server Forward server to enabled chain + http crates
facilitator Forward facilitator (Casper also enables http-client)
telemetry Forward telemetry / tracing
cache r402-core settlement cache
ext-bazaar Bazaar extension
ext-payment-id Payment-identifier extension
all-extensions All built-in extensions
full Every feature above

License

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