TypeScript SDK

x402.settlePayment

Verifies and processes X402 payments for protected resources.

This function implements the X402 payment protocol, verifying payment proofs and settling payments through a facilitator service. It handles the complete payment flow from validation to settlement.

Example

Next.js API route example


// Usage in a Next.js API route
import { settlePayment, facilitator } from "thirdweb/x402";
import { createThirdwebClient } from "thirdweb";
 
const client = createThirdwebClient({
  secretKey: process.env.THIRDWEB_SECRET_KEY,
});
 
const thirdwebFacilitator = facilitator({
  client,
  serverWalletAddress: "0x1234567890123456789012345678901234567890",
});
 
export async function GET(request: Request) {
  const paymentData = request.headers.get("x-payment");
 
  // verify and process the payment
  const result = await settlePayment({
    resourceUrl: "https://api.example.com/premium-content",
    method: "GET",
    paymentData,
    payTo: "0x1234567890123456789012345678901234567890",
    network: "eip155:84532", // CAIP2 format: "eip155:<chain_id>"
    price: "$0.10", // or { amount: "100000", asset: { address: "0x...", decimals: 6 } }
    facilitator: thirdwebFacilitator,
    routeConfig: {
      description: "Access to premium API content",
      mimeType: "application/json",
      maxTimeoutSeconds: 300,
    },
  });
 
  if (result.status === 200) {
    // Payment verified and settled successfully
    return Response.json({ data: "premium content" });
  } else {
    // Payment required
    return Response.json(result.responseBody, {
      status: result.status,
      headers: result.responseHeaders,
    });
  }
}

Express middleware example


// Usage in Express middleware
import express from "express";
import { settlePayment, facilitator } from "thirdweb/x402";
import { createThirdwebClient } from "thirdweb";
 
const client = createThirdwebClient({
  secretKey: process.env.THIRDWEB_SECRET_KEY,
});
 
const thirdwebFacilitator = facilitator({
  client,
  serverWalletAddress: "0x1234567890123456789012345678901234567890",
});
 
const app = express();
 
async function paymentMiddleware(req, res, next) {
  // verify and process the payment
  const result = await settlePayment({
    resourceUrl: `${req.protocol}://${req.get("host")}${req.originalUrl}`,
    method: req.method,
    paymentData: req.headers["x-payment"],
    payTo: "0x1234567890123456789012345678901234567890",
    network: "eip155:8453", // CAIP2 format: "eip155:<chain_id>"
    price: "$0.05",
    facilitator: thirdwebFacilitator,
  });
 
  if (result.status === 200) {
    // Set payment receipt headers and continue
    Object.entries(result.responseHeaders).forEach(([key, value]) => {
      res.setHeader(key, value);
    });
    next();
  } else {
    // Return payment required response
    res
      .status(result.status)
      .set(result.responseHeaders)
      .json(result.responseBody);
  }
}
 
app.get("/api/premium", paymentMiddleware, (req, res) => {
  res.json({ message: "This is premium content!" });
});


function settlePayment(
  args: PaymentArgs,
): Promise<SettlePaymentResult>;

Parameters

Configuration object containing payment verification parameters

Type


let args: {
  facilitator: ReturnType<typeof facilitatorType>;
  method: "GET" | "POST" | ({} & string);
  network: FacilitatorNetwork;
  paymentData?: string | null;
  payTo: Address;
  price: Money | ERC20TokenAmount;
  resourceUrl: string;
  routeConfig?: PaymentMiddlewareConfig;
};

Returns


let returnType: Prettify<
  | {
      paymentReceipt: FacilitatorSettleResponse;
      responseHeaders: Record<string, string>;
      status: 200;
    }
  | PaymentRequiredResult
>;

A promise that resolves to either a successful payment result (200) or payment required error (402)