x402 Client

Make HTTP requests to x402-protected APIs. The x402 protocol uses HTTP 402 responses to request payment — this skill handles signing USDC payments and retrying automatically.

Prerequisites

• Node.js 18+ installed
• A Base Sepolia wallet with ETH (gas) and USDC (payments)

First-Time Setup

1. Install dependencies

bash <skill-dir>/scripts/setup.sh

This installs the x402 SDK to ~/.x402-client/. Only needed once.