Скачать или смотреть Monetize APIs with x402: Build Pay-Per-Use Web3 Endpoints (Full Express.js Demo) |

Ever wanted to monetize your API—without complex payment flows, clunky signups, or third-party billing headaches?

In this hands-on guide, we’ll show how to use the x402 protocol to build pay-per-use, onchain API endpoints in Node.js and Express.
You’ll protect your API with frictionless, HTTP-native web3 payments—letting users pay in USDC (or other tokens) right from the browser or code.

Whether you’re an API developer or service provider, x402 makes it easy to accept small crypto payments for your endpoints, with minimal changes to your stack.

What You’ll Learn:
Set up a Node.js + TypeScript project for x402
Configure secure environment variables for payments
Add x402-protected endpoints using Express
Require USDC payments on Base Sepolia testnet
Test “402 Payment Required” UX in your browser
Extend for EIP-3009 tokens with minimal config
Prep your API for mainnet, multi-asset support, and more

🔗 Resources
x402 GitHub Repo : https://github.com/coinbase/x402
x402 Protocol & Express SDK Docs : https://docs.cdp.coinbase.com/x402
Coinbase Developer Platform Docs : https://docs.cdp.coinbase.com/
HeimLabs : https://heimlabs.com/

⏱️ Timestamps
0:00 – Intro: Why Pay-Per-Use APIs
1:00 – Project Setup & Dependencies
2:43 – Environment Variables & Config
4:12 – Building x402-Protected Endpoints
7:15 - Supporting Other Tokens (EIP-3009 Example)
9:43 – Browser Testing “402 Payment Required”
11:38 – Recap & Next Steps(Conslusion)

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What API would you monetize with x402?
Stay tuned for more Web3 API tutorials from ‪@coinbase‬ and ‪@HeimLabs‬

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