Crate r402_tron 

Tron chain support for the x402 payment protocol.

This crate provides implementations of the x402 payment protocol for Tron chains with the “exact” payment scheme based on EIP-3009 transferWithAuthorization and SUN.io Permit2 via x402ExactPermit2Proxy.

Features

• CAIP-2 Addressing: Uses CAIP-2 chain IDs (e.g., tron:0x2b6653dc) for chain identification
• Base58Check Addresses: Tron-native T-prefixed addresses with 0x41 prefix
• TIP-712 Signing: Byte-compatible with EIP-712, using secp256k1 ECDSA
• EIP-3009 Payments: Gasless token transfers using transferWithAuthorization
• Permit2 Payments: SUN.io Permit2 fallback for tokens without EIP-3009 (e.g. USDT)
• TronGrid API: HTTP REST API for chain interaction (no JSON-RPC)

Architecture

The crate is organized into two modules:

• chain - Core Tron chain types, providers, and contract bindings
• exact - Tron “exact” payment scheme

Feature Flags

• server - Server-side price tag generation
• client - Client-side payment signing
• facilitator - Facilitator-side payment verification and settlement
• telemetry - OpenTelemetry tracing support

Re-exports

pub use exact::TronExact;

pub use exact::client::Eip3009SigningParams;client

pub use exact::client::Permit2SigningParams;client

pub use exact::client::SignerLike;client

pub use exact::client::TronExactClient;client

Modules

chain

Tron chain support for x402 payments.

exact

Tron “exact” payment scheme implementation.

Structs

USDT

Ergonomic accessors for USDT token deployments on well-known Tron chains.

Constants

TRON_DEFAULT_CLOCK_SKEW_TOLERANCE_SECS

Default clock-skew tolerance (seconds) applied to TIP-712 time-window checks.

Statics

TRON_NETWORKS

Well-known Tron networks with their names and CAIP-2 identifiers.

Functions

usdt_tron_deployment

Returns the USDT deployment for a specific Tron chain, if known.

usdt_tron_deployments

Returns all known USDT deployments on Tron chains.