from flask import Flask
from blockchain0x import Client
from blockchain0x_x402.server import x402_before_request_factory, PricingEntry

sdk = Client()  # reads BLOCKCHAIN0X_API_KEY
app = Flask(__name__)

# Only routes named in the pricing table are gated.
app.before_request(x402_before_request_factory(
    sdk=sdk,
    pricing={
        "POST /api/expensive-operation": PricingEntry(
            amount_usdc="0.50",
            pay_to_address="0xYourAgentWalletAddress",
            payment_request_id="pr_demo",
        ),
    },
))

@app.route("/api/expensive-operation", methods=["POST"])
def expensive_operation():
    return run_the_work()  # only runs after X-Payment verifies

import express from "express";
import { createClient } from "@blockchain0x/node";
import { createX402Middleware } from "@blockchain0x/x402/server/express";

const sdk = createClient({ apiKey: process.env.BLOCKCHAIN0X_API_KEY! });
const app = express();

// Only routes named in the pricing table are gated.
app.use(createX402Middleware({
  sdk,
  pricing: {
    "POST /api/expensive-operation": {
      amountUsdc: "0.50",
      payToAddress: "0xYourAgentWalletAddress",
      paymentRequestId: "pr_demo",
    },
  },
}));

app.post("/api/expensive-operation", async (req, res) => {
  res.json(await runTheWork());  // req.x402Payment holds the verified payment
});

import (
  "net/http"
  x402 "tosh-labs/blockchain0x-x402-go"
)

func main() {
  pricing := map[string]x402.PricingEntry{
    "POST /api/expensive-operation": {
      AmountUSDC:       "0.50",
      PayToAddress:     "0xYourAgentWalletAddress",
      PaymentRequestID: "pr_demo",
    },
  }

  // serverSdk is your Blockchain0x Go SDK client.
  h := x402.Middleware(x402.ServerOptions{Sdk: serverSdk, Pricing: pricing})(
    http.HandlerFunc(expensiveOperation))
  http.Handle("/api/expensive-operation", h)
  http.ListenAndServe(":8080", nil)
}