How to Verify USDC Payments on Base Without a Payment Processor
The Problem Nobody Talks About You want to accept a $10,000 USDC payment. You have two options: Option A: Integrate a payment processor like Coinbase Commerce. Set up an account, embed their checkout widget, handle their SDK. Pay $100 in fees (1%). Option B: Build your own blockchain listener. Learn ethers.js, subscribe to USDC transfer events, handle reorgs, confirmations, edge cases. Two weeks of work, minimum. There's no middle ground. No service that just tells you: "Yes, this specific payment arrived." Until now. https://paywatcher.dev?utm_source=hackernews
How to Verify USDC Payments on Base Without a Payment Processor launched on February 22, 2026 with 7 votes, #1,385 of 16,627 launches that month and more than 75% of that year's launches.
What it does
PayWatcher — non-custodial stablecoin payment verification. x402-ready — built for AI Agent payments on Base, Arbitrum, Ethereum, Optimism and Polygon.
curl -X POST https://api.paywatcher.dev/v1/payments \ -H "x-api-key: pw_live_..." \ -H "Content-Type: application/json" \ -d '{"amount": "49.99", "currency": "USDC", "network": "arbitrum"}' Get API Key — Free Try the Demo The payment verification dilemma Use Coinbase Commerce Pay 1% per transaction. Non-custodial verification. Flat-rate pricing. Three API calls. MCP Servers, AgentKit, autonomous agents — they all need to pay. Maintaining your own RPC nodes and building a custom verification layer just to accept machine payments is weeks of infra work. Your agent sends USDC. PayWatcher confirms it. Your server unlocks the resource. $0.05. Native HTTP 402 support — no custom infra, no…from paywatcher.dev
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x4022025 · x402.org · ▲119Hi HN – excited to announce x402, initially developed by Coinbase (YC 12) x402 lets any HTTP API charge per request without issuing API keys or storing credit cards. Buyers (humans or AI agents) keep funds in their own wallet and dynamically discover compatible endpoints, call them as usual, and automatically pay a microtransaction in USDC or other tokens to settle. 90 second demo: https://www.youtube.com/watch?v=PV-L2AfLhJg Problem: Every time we want to use a new API we have to: find the service online create a developer account, copy a secret key into env vars, pre-fund or…
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