Merchant Introduction

Learn how to sell services with x402 on bex.co

Monetize Your API with x402​

x402 enables you to monetize HTTP APIs and content with on-chain payments while maintaining your existing infrastructure. bex.co provides enterprise-grade x402 facilitator services with Sui-first, multi-network support.

Key Benefits​

• Zero network fees for merchants and customers
• Sub-second payment settlement on Sui blockchain
• Multi-network support: Sui, Ethereum, Base, Polygon, Avalanche, and more
• Universal compatibility with any HTTP-capable service
• Enterprise reliability: 99.9% uptime SLA

Architecture Overview​

The x402 protocol enables seamless HTTP-native payments with four key components:

System Components​

• Client: Initiates requests to protected resources and submits on-chain payments
• Server (Merchant): Your application that defines payment requirements, validates payments, and delivers services
• bex.co Facilitator: Handles payment verification and settlement through standardized endpoints
• Blockchain: Executes and confirms all payment transactions (Sui, Ethereum, etc.)

How It Works​

1. Request: Client requests a protected resource from your server
2. 402 Response: Your server returns HTTP 402 with payment details
3. Payment Authorization: Client signs a payment authorization
4. Verification: bex.co facilitator verifies and settles the payment on-chain
5. Delivery: Your server receives confirmation and delivers the requested resource

Getting Started​

Prerequisites​

Before implementing x402 on your server:

1. Get a bex.co API Key: Sign up for a free account
2. Choose your blockchain: We recommend starting with Sui for fastest settlement
3. Select your framework: We provide SDKs for popular frameworks

Quick Start Guides​

bex.co Facilitator Configuration​

Production Endpoint​

https://x402.bex.co

Supported Networks​

SDK Installation​

# Node.js / TypeScript
npm install x402
 
# Python
pip install x402

Quick Example​

Here's a simple example of protecting an endpoint with x402 using Express.js:

import { paymentMiddleware } from "x402-express";
 
app.use(
  paymentMiddleware(
    process.env.ADDRESS as `0x${string}`,
    {
      "GET /api/premium/data": {
        price: "$0.01",
        network: "sui",
      },
    },
    {
      url: "https://x402.bex.co",
      apiKey: process.env.BEX_API_KEY,
    },
  ),
);
 
app.get("/api/premium/data", (req, res) => {
  res.json({ data: "Premium content" });
});

Next Steps​

1. Quick Start Guide - Get started with x402 in minutes
2. Implement a Crypto Paywall - Build a complete paywall system
3. Join the Waitlist - Get early access to bex.co x402 facilitator

Additional Resources​

• API Documentation: Detailed x402 protocol specification (coming soon)
• SDKs: TypeScript, Python, Rust, and Go client libraries (coming soon)
• Dashboard: Monitor transactions and manage your x402 endpoints at bex.co/dash
• Support: Get help on our Discord or GitHub

Pricing​

bex.co charges a small facilitator fee per transaction:

• Free Tier: First 1,000 transactions/month free
• Pro Tier: $0.001 per transaction after free tier
• Enterprise: Custom pricing for high-volume merchants

View full pricing details →