@sei-js/coinbase-x402

@coinbase/x402

The official Coinbase facilitator package for the x402 Payment Protocol. This package provides direct access to Coinbase's hosted facilitator service, enabling seamless payment verification and settlement.

Installation

npm install @coinbase/x402

Environment Variables

This package requires CDP API keys from the Coinbase Developer Platform:

• CDP_API_KEY_ID: Your CDP API key ID
• CDP_API_KEY_SECRET: Your CDP API key secret

Quick Start

// Option 1: Import the default facilitator config (assumes CDP_API_KEY_ID and CDP_API_KEY_SECRET environment variables)
import { facilitator } from "@coinbase/x402";

// Option 2: Create a custom facilitator config, passing in your credentials
import { createFacilitatorConfig } from "@coinbase/x402";

const facilitator = createFacilitatorConfig(
  "your-cdp-api-key-id",
  "your-cdp-api-key-secret"
);

// Use the facilitator config in your x402 integration

Integration Examples

With Express Middleware

import express from "express";
import { paymentMiddleware } from "x402-express";
import { facilitator } from "@coinbase/x402";

const app = express();

app.use(paymentMiddleware(
  "0xYourAddress",
  {
    "/protected": {
      price: "$0.10",
      network: "base-sepolia"
    }
  },
  facilitator // Use Coinbase's facilitator
));