x402 Track 06 Β· Final
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Build a Paid API in 3 Lines of Code
Everything you've learned comes together in real code.
One x402-next middleware can monetize any API.
What you'll learn
- βServer: protect APIs with x402-next middleware (install β configure β route β env vars)
- βClient: auto-payment fetch using the x402-fetch SDK
- βRecipes: per-route pricing, free trials, payment webhooks, and testnet development
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x402-next
Next.js middleware package. Add USDC payment protection to any API route in 3 lines.
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x402-fetch
A fetch-compatible client SDK. Fully automates 402 handling, signing, and retrying.
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Base Sepolia
Test the full flow with free test USDC β no real money needed.