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r402-tvm

TON (TVM) chain support for the x402 payment protocol, part of the r402 workspace.

Highlights

Exact scheme — one TEP-74 jetton_transfer authorized as a W5R1 internal_signed message. The facilitator Highload V3 wallet relays the signed body and sponsors gas.
CAIP-2 networks — tvm:-239 (mainnet) and tvm:-3 (testnet). The signed integer reference is preserved through ChainId.
Sponsored fees — price_tag copies areFeesSponsored: true from /supported. Clients must set the same extra.
In-process facilitator — Toncenter / TonAPI REST verify and settle. Duplicate settle is blocked by SettlementCache (120s TTL) keyed by the settlement BoC hash. Failed and successful sends keep the key until TTL.

Cargo Features

Feature	Surface
`client`	Buyer-side W5R1 settlement BoC signing.
`server`	Server-side `PriceTag` generation.
`facilitator`	On-chain verify and Highload V3 batch settle.
`telemetry`	`tracing` instrumentation.
`full`	All of the above.

Quick Start (server price tag)

use r402_tvm::{TvmExact, USDT};

let tag = TvmExact::price_tag(pay_to, USDT::tvm_testnet().amount(10_000u128));

Documentation

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

License