@erudite-intelligence/x402-ltc

x402 Payment Protocol V2 — Litecoin Plugin

The first x402 implementation for Litecoin. PSBT-based LTC payments for AI agents and web services.

Published by Erudite Intelligence LLC under the @erudite-intelligence npm org.

Overview

This package implements the exact payment scheme for the x402 protocol on the Litecoin blockchain. It uses Partially Signed Bitcoin Transactions (PSBTs) — the same mechanism as the Bitcoin implementation — because Litecoin is a Bitcoin fork with SegWit support.

Network: Litecoin (LTC)
Scheme: exact
CAIP-2: bip122:12a765e31ffd4059bada1e25190f6e98 (mainnet)
Unit: litoshis (1 LTC = 100,000,000 litoshis)
Address formats: P2WPKH (ltc1q...), P2PKH (L...), P2SH (M... or 3...)

Install

npm install @erudite-intelligence/x402-ltc

Usage

Client (Payer)

const { createPayment } = require("@erudite-intelligence/x402-ltc");

const payload = await createPayment(
  {
    scheme: "exact",
    network: "bip122:12a765e31ffd4059bada1e25190f6e98",
    amount: "1000000",     // 0.01 LTC in litoshis
    asset: "LTC",
    payTo: "ltc1qmerchantaddress...",
    maxTimeoutSeconds: 300,
  },
  {
    privateKey: "your-wif-or-hex-private-key",
    utxos: [
      { txid: "abc123...", vout: 0, value: 50000000 }
    ],
  }
);

Server (Facilitator)

const { verifyPayment, settlePayment } = require("@erudite-intelligence/x402-ltc");

// Verify
const result = await verifyPayment(
  paymentPayload,
  expectedPayTo,
  expectedAmount,
  expectedNetwork
);

// Settle
if (result.isValid) {
  const settlement = await settlePayment(paymentPayload, expectedNetwork);
}

Register with x402 Facilitator

const { registerExactLtcScheme } = require("@erudite-intelligence/x402-ltc");

registerExactLtcScheme(facilitatorServer, { network: "mainnet" });

Security

All security patches from @erudite-intelligence/x402-btc are inherited:

• Cryptographic ECDSA signature verification (not just finalization check)
• Fail-closed UTXO verification (rejects payment if API unreachable)
• Phantom Funds check (on-chain value vs PSBT value)
• Script Spoofing protection (on-chain scriptPubKey vs PSBT)
• SIGHASH_ALL enforcement
• CLEANSTACK enforcement (P2WPKH witness must have exactly 2 items)
• Duplicate input detection
• Low-S signature enforcement (BIP-146)

Related Packages

• @erudite-intelligence/x402-btc — Bitcoin
• @erudite-intelligence/x402-doge — Dogecoin
• @erudite-intelligence/x402-xrp — XRP Ledger
• @erudite-intelligence/x402-tron-v2 — Tron USDT
• @erudite-intelligence/x402-kaspa — Kaspa

Erudite Intelligence LLC — Building the x402 ecosystem beyond EVM and Solana.