Overview
0xPay SDK explored whether APIs could charge per request without exposing payloads. The answer was a ZK-backed payment flow that verifies usage while keeping the request itself private.
What it does
- Usage verification with Noir zero-knowledge proofs.
- Automated PYUSD settlement.
- SDK abstraction so the payment layer stays invisible to the API consumer.
Why it matters
It was a useful exercise in making payment rails feel like infrastructure instead of a product burden. The best part of the project was the protocol framing, not the hackathon placement.