The live terminal
A native, GPU-drawn terminal built for event contracts. Open any market and watch its quotes and every trade arrive live, without a browser tab's lag between you and the book.
Features
Everything you need to read the book.
Every part of Harpoon, what it does and where it stands. "In private testing" means it works today, for a small group. The rest are on their way, with no dates promised.
The terminal
Order-book heatmap
The full depth of the book drawn as a heatmap over time, so walls, pulls and sweeps are something you see rather than infer from a ladder.
The Finder
Type any letter to search, or walk down from a sport to a game to its markets. Selecting a contract is what loads it: nothing is fetched until you choose.
The data
Every trade of a contract's life
Each contract's trades are recorded as they happen and kept whole, so the history you scroll back through is the market as it was, not a summary of it.
More venues
One regulated US venue comes first. More prediction-market venues follow, each in the same canonical form so one terminal and one script work across all of them.
Scripts and alerts
Scripts
A scripting language built into the terminal. Write a study once and run it on any contract, live or over its history.
Backtests
Replay a script over the recorded tape of past contracts and see what it would have done. Past results never promise future ones.
Script library
A shared library inside the terminal: publish a script, follow the people whose work you trust, and install theirs without copying code around.
Always-on alerts
Alerts run on our servers, not your machine: large trades on the contracts you chose, or anything a script you approve can describe, sent to Telegram or Discord.
Where you use it
In your browser
The browser build draws with WebGPU from the same code as the desktop app, so a contract looks the same in a tab as it does on the desktop.
Windows and Mac apps
Installers for Windows and Mac, signed and kept up to date, drawing every contract identically to the browser build.