@erudite-intelligence/x402-sui

x402 exact payment scheme implementation for Sui SUI.

Part of the EruditePay x402 multi-chain payment infrastructure by Erudite Intelligence LLC.

Overview

This package implements the x402 protocol's exact payment scheme for the Sui network. It enables HTTP 402-based micropayments using native SUI coin transfers via splitCoins + transferObjects.

• CAIP-2 Network ID: sui:mainnet
• Unit: MIST (1 SUI = 1,000,000,000 MIST)
• Signing: Ed25519 via @mysten/sui
• Verification: Sui JSON-RPC (fullnode)

Installation

npm install @erudite-intelligence/x402-sui

Usage

Client — Create a Payment

import { createPayment } from "@erudite-intelligence/x402-sui";

const paymentHeader = await createPayment({
  senderSecretKey: "suiprivkey1...",
  recipientAddress: "0xabc...",
  amountMist: "1000000000",  // 1 SUI
  network: "mainnet",
});

Server — Verify & Settle

import { verifyAndSettle } from "@erudite-intelligence/x402-sui";

const result = await verifyAndSettle({
  paymentHeader: req.headers["x-payment"],
  expectedRecipient: "0xabc...",
  expectedAmountMist: "1000000000",
  network: "mainnet",
});

if (result.success) {
  console.log("Settled:", result.digest);
}

Security

• Replay protection: In-memory Map with 1-hour TTL. Multi-instance deployments MUST use Redis/DB.
• Fail-closed: If balance query or RPC call fails, the payment is REJECTED.
• Object model: Sui's UTXO-like object model provides inherent replay protection at the protocol level.

License

MIT — Erudite Intelligence LLC