@erudite-intelligence/x402-algo

x402 exact payment scheme implementation for Algorand ALGO.

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 Algorand network. It enables HTTP 402-based micropayments using native ALGO payment transactions.

• CAIP-2 Network ID: algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73k
• Unit: microAlgos (1 ALGO = 1,000,000 microAlgos)
• Signing: Ed25519 via algosdk
• Verification: Algonode.io (Algod + Indexer)

Installation

npm install @erudite-intelligence/x402-algo

Usage

Client — Create a Payment

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

const paymentHeader = await createPayment({
  senderMnemonic: "abandon abandon ... about",
  recipientAddress: "AAAAA...",
  amountMicroAlgos: "1000000",  // 1 ALGO
  network: "mainnet",
});

Server — Verify & Settle

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

const result = await verifyAndSettle({
  paymentHeader: req.headers["x-payment"],
  expectedRecipient: "AAAAA...",
  expectedAmountMicroAlgos: "1000000",
  network: "mainnet",
});

if (result.success) {
  console.log("Settled:", result.txId, "Round:", result.confirmedRound);
}

Security

• Replay protection: In-memory Map with 1-hour TTL. Multi-instance deployments MUST use Redis/DB.
• Fail-closed: If balance query or API call fails, the payment is REJECTED.
• Round validation: Transaction validity is checked against current network round.
• On-chain field verification: Transaction outputs are decoded and checked against expected values.

License

MIT — Erudite Intelligence LLC