Wisp

Wisp lets anyone send USDC to an @handle or email on Monad Testnet—no wallet-address hunt. Recipients claim via a private inbox note or bearer link, with settlement protected by client-side Groth16 proofs so payment graphs stay private. We built it after a simple friend payment turned into awkward address swaps and forever-public wallet links. Fixed-denomination pools (1 / 10 / 50 / 100 USDC), encrypted note delivery, and on-chain nullifiers make crypto feel closer to sending a message. Building on Monad taught us how far client-side ZK + a durable indexer can go for private payments—and how much anonymity-set size and ops maturity still matter before production.