x402 Bazaar (Discovery Layer)

import { useFacilitator } from "x402/verify";
import { facilitator } from "@coinbase/x402";

// Get the list function from the facilitator
const { list } = useFacilitator(facilitator);

// Fetch all available services
const services = await list();

// NOTE: in an MCP context, you can see the full list then decide which service to use

// Find services under $0.10
const usdcAsset = "0x036CbD53842c5426634e7929541eC2318f3dCF7e";
const maxPrice = 100000;

const affordableServices = services.items.filter(item => item.accepts.find(paymentRequirements => paymentRequirements.asset == usdcAsset && Number(paymentRequirements.maxAmountRequired) < maxPrice));

import { withPaymentInterceptor } from 'x402-axios';
import axios from 'axios';
import { privateKeyToAccount } from 'viem/accounts';

// Set up your payment account
const account = privateKeyToAccount('0xYourPrivateKey');

// Select a service from discovery
const selectedService = affordableServices[0];

// Create a payment-enabled client for that service
const client = withPaymentInterceptor(
  axios.create({ baseURL: selectedService.endpoint }), 
  account
);

// Select the payment method of your choice
const selectedPaymentRequirements = selectedService.accepts[0];
const inputSchema = selectedPaymentRequirements.outputSchema.input;

// Build the request using the service's schema
const response = await client.request({
  method: inputSchema.method,
  url: inputSchema.resource,
  params: { location: 'San Francisco' } // Based on inputSchema
});

console.log('Response data:', response.data);

// Next.js / Express / Hono
import { require402Payment } from 'x402-express';

app.use(require402Payment({
  routes: {
    "/api/weather": {
      price: "$0.001",
      network: "base",
      config: {
        description: "Get current weather data for any location",
        inputSchema: { 
          queryParams: { 
            location: { 
              type: string, 
              description: "City name or coordinates", 
              required: true
            }
          }
        },
        outputSchema: {
          type: "object",
          properties: { 
            temperature: { type: "number" },
            conditions: { type: "string" },
            humidity: { type: "number" }
          }
        }
      }
    }
  }
}));