The missing piece of the internet is here. PAY402 is the Express middleware that turns HTTP 402 into a native, gas-free payment layer for your APIs.
Built for developers, powered by 100Pay.
Accept payments across 8+ blockchains without users needing ETH or SOL for gas. Frictionless crypto payments are finally here.
Drop-in integration for your Node.js apps. Just `app.use(withPay402)` and your routes are instantly monetized.
Automatically uploads your route configurations to the NanoApps Store, making them discoverable by AI agents like Claude and Gemini.
Optimized for performance. Route configurations are only uploaded when changes are detected, keeping your startup times fast.
Payments are automatically settled in stablecoins or fiat directly to your bank account via the 100Pay infrastructure.
Built with TypeScript from the ground up. Enjoy full type safety, autocompletion, and a developer experience that just works.
Choose your integration path
import express from 'express';
import { withPay402 } from '@100pay-hq/pay402';
const app = express();
// Configure your monetized routes
const config = {
_100PayApiKey: "your-api-key",
wallet: "0xYourWallet...",
routes: [
{
path: "/api/premium-data",
method: "GET",
price: async (req) => ({
amount: "1.00",
currency: "USD"
})
}
]
};
// Apply the middleware
app.use(withPay402(config));
app.listen(3000);import axios from 'axios';
import { withPay402Interceptor } from '@100pay-hq/pay402-axios';
import { createWalletClient, http } from 'viem';
const client = axios.create({ baseURL: 'https://api.example.com' });
// 1. Setup Wallet for signing
const walletClient = createWalletClient({
account: privateKeyToAccount("0xYourPrivateKey"),
transport: http()
});
// 2. Define payment handler
const signTransaction = async (pricing, resource) => {
// Select payment option (e.g. USDC, SOL, PAY)
const option = pricing.find(p => p.currency === 'USDC');
// Execute transfer via 100Pay.js
const tx = await _100PayClient.transfer.executeTransfer({
amount: option.amount,
to: option.payTo,
symbol: "USDC"
});
return tx.transactionHash;
};
// 3. Attach Interceptor
withPay402Interceptor(client, signTransaction, walletClient);
// 4. Make requests (payments handled automatically)
await client.post('/premium-service', { data: 'foo' });