Show HN: How to Verify USDC Payments on Base Without a Payment Processor

[Sem_pre]

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

[cellis]

Do you only support USDC?

[Sem_pre]

Yes, USDC on Base for now. The architecture is token-agnostic though — adding USDT or DAI is mostly config, not a rewrite. Base was the starting point because of low fees and Circle's native USDC support. Which token/chain would be most useful for you?