x402 paymentsPrivate preview

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

app.use(
  paymentMiddleware(
    {
      "GET /paid": {
        accepts: [
          {
            scheme: "exact",
            price: "$0.01",
            network: "eip155:84532",
            payTo: createPayToAddress,
          }
        ],
        description: "Data retrieval endpoint",
        mimeType: "application/json",
      }
    },
    new x402ResourceServer(facilitatorClient).register(
      "eip155:84532",
      new ExactEvmScheme()
    )
  )
)

import Stripe from "stripe";

const stripe = new Stripe(process.env.STRIPE_SECRET_KEY, {
  apiVersion: "2026-03-04.preview",
});

const validPayToAddresses = new Set<string>();

async function createPayToAddress(context) {
  // If a payment header exists, extract the destination address from it
  if (context.paymentHeader) {
    const decoded = JSON.parse(
      Buffer.from(context.paymentHeader, "base64").toString()
    );
    const toAddress = decoded.payload?.authorization?.to;

    if (toAddress && typeof toAddress === "string") {
      if (!validPayToAddresses.has(toAddress)) {
        throw new Error("Invalid payTo address: not found in server cache");
      }
      return toAddress;
    }

    throw new Error(
      "PaymentIntent did not return expected crypto deposit details"
    );
  }

  // Create a new PaymentIntent to get a fresh crypto deposit address
  const decimals = 6; // USDC has 6 decimals
  const amountInCents = Number(10000) / Math.pow(10, decimals - 2);

  const paymentIntent = await stripe.paymentIntents.create({
    amount: amountInCents,
    currency: "usd",
    payment_method_types: ["crypto"],
    payment_method_data: {
      type: "crypto",
    },
    payment_method_options: {
      crypto: {
        // @ts-ignore - Stripe crypto payments beta feature
        mode: "deposit",
        deposit_options: {
          networks: ["base"],
        },
      },
    },
    confirm: true,
  });

  if (
    !paymentIntent.next_action ||
    !("crypto_display_details" in paymentIntent.next_action)
  ) {
    throw new Error(
      "PaymentIntent did not return expected crypto deposit details"
    );
  }

  // Extract the Base network deposit address from the PaymentIntent
  const depositDetails = paymentIntent.next_action
    .crypto_display_details;
  const payToAddress = depositDetails.deposit_addresses["base"].address;

  console.log(
    `Created PaymentIntent ${paymentIntent.id} for $${(
      amountInCents / 100
    ).toFixed(2)} -> ${payToAddress}`
  );

  validPayToAddresses.add(payToAddress);
  return payToAddress;
}