I built a smart-contract escrow app so people can actually use crypto for real-world purchases

Hey r/startups_promotion 👋
I’m the founder of Shake Defi, a mobile app that lets buyers and sellers use crypto with built-in escrow and buyer protection.

One thing that always bothered me about crypto is how hard it is to use outside the internet. Paying for a used car, hiring a contractor, or buying expensive goods feels risky because once you send crypto, it’s final.

So we built Shake Defi to solve that.

What it does

• Buyer locks funds into a smart-contract escrow
• Seller delivers the good or service
• After the escrow period, funds are released automatically
• If something goes wrong, the buyer can open a dispute and request a refund
• No banks, no chargebacks, no middlemen

It’s non-custodial, runs on Ethereum L2 (Base), and uses Coinbase for on/off-ramping so users don’t deal with private keys or weird UX.

We’re starting with real-world transactions like:

• Used cars (FSBO)
• In-person sales
• Services with delayed delivery

The app is live, and we’re actively looking for:

• Early users willing to test real transactions
• Brutally honest feedback on UX, pricing, and trust
• Founders who’ve tried (and failed) to use crypto for real commerce

If you’ve ever thought “crypto should be usable like a credit card, but safer”, I’d love your thoughts.

Website: https://shakedefi.com
Happy to answer questions in the comments.

— Matt