@ampvaleo/x402-hyperliquid-server

Verify EIP-712 payments, optionally settle on Hyperliquid’s /exchange endpoint, and wire into Express or Next.js App Router handlers.

import express from "express";
import { InMemoryNonceStore, x402Hyperliquid } from "@ampvaleo/x402-hyperliquid-server";

const app = express();
app.get(
  "/resource",
  x402Hyperliquid({
    price: "0.01",
    payTo: "0x…",
    chain: "testnet",
    sourceDex: "spot",
    destinationDex: "spot",
    nonceStore: new InMemoryNonceStore(),
  }),
  (req, res) => res.json({ ok: true }),
);

For App Router, use runX402HyperliquidGate(request, options) and short-circuit with the returned Response when ok is false.

Settlement: omit settle to default to posting to Hyperliquid. For local dev, X402_HL_DEV_VERIFY_ONLY=1 skips settlement (blocked in production unless X402_HL_ALLOW_VERIFY_ONLY_IN_PROD=1). See resolveSettlementMode / assertDevVerifyOnlyEnvAllowed.

See the root README.