r402-stellar

Stellar chain support for the x402 payment protocol, part of the r402 workspace.

Highlights

• Exact scheme — one SEP-41 transfer authorized as Soroban auth entries. The facilitator is the transaction source, pays fees, and optionally wraps a fee-bump.
• CAIP-2 networks — stellar:pubnet and stellar:testnet. Pubnet requires an operator RPC URL.
• Sponsored fees — price_tag copies areFeesSponsored: true from /supported. Clients must set the same extra; false is rejected.
• In-process facilitator — stellar-rpc-client 27 verify, rebuild, submit, and confirm. Duplicate settle is blocked by SettlementCache (120s TTL) keyed by the payload transaction XDR.

Cargo Features

Quick Start (server price tag)

use r402_stellar::{StellarExact, USDC};

let tag = StellarExact::price_tag(pay_to, USDC::stellar_testnet().amount(10_000_000));

Documentation

• Crate docs: https://docs.rs/r402-stellar
• Project README: ../../README.md

License

Dual-licensed under MIT and Apache-2.0.