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. What If Verification Was a Simple API Call? PayWatcher is a verification layer for stablecoin payments on Base. It doesn't process payments. It doesn't touch your funds. It doesn't require a checkout flow. You tell it what payment you expect. It watches the blockchain. When the payment arrives, you get a webhook. That's it. Here's the cost comparison for verifying a $10,000 USDC transfer: Service Fee Model Coinbase Commerce $100.00 1% of transaction NOWPayments $50.00 0.5