What is hypurr-harbor?

Hypurr Harbor is a playful pixel-art visualization of the Hyperliquid blockchain's live activity. Instead of showing raw data on a chart, it renders a tiny retro harbor scene in your browser. Every pending transaction appears as a cat sitting on a pier, and every confirmed block arrives as a boat. When a block confirms, the cats whose transactions made it into that block hop aboard and sail off. Transactions that never confirm simply slip through the planks into the water. The cats are deterministic: the same transaction always produces the same cat, with coat, markings, and name derived from the transaction hash. Visual details carry meaning. Golden cats are orders paying a priority fee, high-visibility cats are cancel orders, and cat size reflects the order type, from tiny cancels to large whale transfers. The boarding order mirrors the real consensus sequence the blockchain uses. You can hover to pet a cat, click to pin a live info card that updates as the transaction confirms, and hunt for easter eggs hidden in the scene. Under the hood, a small Node relay server subscribes to two live data streams from a single Quicknode Hyperliquid endpoint: one for pending transactions and one for block confirmations. It rebroadcasts every event to your browser immediately, with no batching or delay, so what you see on screen matches real on-chain timing. The relay also translates numeric asset IDs into coin names, anchors block numbers to match what explorers show, and shuts down its upstream streams when nobody is watching to avoid wasting resources. The frontend is built with Vite, TypeScript, and PixiJS for rendering. All sprites are drawn procedurally with no image files, and audio is synthesized in the browser, except for one real cat meow used under a Creative Commons license. To run it locally you need Node 20 or newer. With no credentials it starts in demo mode, generating synthetic traffic. Add a Quicknode endpoint and API token to connect to live mainnet data. You can host the whole app as a single process on any platform that keeps a long-running server alive, such as Railway or a VPS.