HyperDrop

HyperDrop provides a secure environment to auction anything from Real World Assets to video game items. It allows you to launch fashion drops immune to bots, issue VIP tickets impossible to fake, or trade unique art pieces. All settled in a single, instant transaction that mints an NFT and ENV domain as undeniable proof of ownership. It turns every sale into a fair, lightning-fast battle, leaving you free to create whatever you want. The only limit is the one you set for yourself.

Interface: I built this using Next.js 16, React 19, and TailwindCSS v4. I didn't want it to feel like a slow dApp, so I used Framer Motion to make every interaction smooth and immediate. It feels more like a game UI than a finance app.

Bidding Logic: To avoid paying gas fees for every single bid, I used Yellow Network's Nitrolite SDK. This lets users deposit USDC once on Sepolia, and then place bids just by signing EIP-712 messages with their wallet. These signatures happen off-chain instantly, so you aren't waiting for block confirmations every time you click "bid".

Relayer: I built a simple relayer using Next.js API routes to catch these signed messages. It validates the crypto signatures against the channel state and keeps track of who is winning in real-time, only updating the main smart contract on Sepolia when absolutely necessary to sync the top bidder.

Settlement: When the auction ends, the winner triggers the settle function on the smart contract. Aside from the initial top-up, this is the only time we hit the main blockchain: a single transaction verifies the win and mints the NFT.

Identity: I also hooked it up to ENS. In that same final transaction, the contract automatically calls the ENS NameWrapper to assign a subname (like 59.hyperdrop.eth) to the winner, linking the physical item directly to their digital identity.