Herald Protocol — Payment Infrastructure for AI Agents

x402

Add the Herald facilitator to your server. Charge per request, per call, per artifact. Works with any x402 client. Settles on 0G in any ERC20 token.

→ Quickstart for sellers

server.ts TypeScript

import { paymentMiddleware, x402ResourceServer } from "@x402/hono";
import { HTTPFacilitatorClient } from "@x402/core/server";
import { ExactEvmScheme } from "@heraldprotocol/x402/server";

const facilitator = new HTTPFacilitatorClient({
  url: "https://facilitator.heraldprotocol.xyz",
});

app.use(paymentMiddleware({
  "GET /weather": {
    accepts: [{
      scheme: "exact",
      price: "$0.001",
      network: "eip155:16661",
      payTo: "0x...",
    }],
  },
}, new x402ResourceServer(facilitator)
  .register("eip155:16661", new ExactEvmScheme())));

MPP

Add MPP payment requirements to your server. Charge per request, per call, per artifact. Works with any MPP client. Settles directly on-chain — verify and broadcast payments yourself, no facilitator required.

→ Quickstart for sellers

server.ts TypeScript

import { zerog } from "@heraldprotocol/mpp/server";
import { Mppx } from "mppx/hono";

const mppx = Mppx.create({
  methods: [zerog({ recipient: account.address, account })],
});

app.get(
  "/weather",
  mppx.charge({ amount: "0.001" }),
  (c) => c.json({ weather: "sunny" })
);

Router

Pay any protected service (HTTP 402) from anywhere without bridging. The router accepts payment on 0G and forwards on the destination server or chain. MPP routing coming soon — settle on blockchain, Tempo, Stripe, card, or other fiat rails.

→ Overview

client.ts TypeScript

import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { wrapFetchWithPayment } from "@x402/fetch";

const client = new x402Client();
client.register("eip155:16661", new ExactEvmScheme(signer));

const fetchWithPayment = wrapFetchWithPayment(fetch, client);

const url = "https://router.heraldprotocol.xyz/route/x402?url=" + dest;
await fetchWithPayment(url);

Payment infrastructure
for AI agents

How agent payment works

How the router works

Start building

x402

MPP

Router

Agents transact.
Capital moves.

Payment infrastructure for AI agents

How agent payment works

How the router works

Start building

x402

MPP

Router

Agents transact. Capital moves.

Payment infrastructure
for AI agents

Agents transact.
Capital moves.