LAD—01
Combined ladder
Kalshi and Polymarket on a shared price axis, fee-adjusted, YES and NO folded into one view. Each rung shows which venue it came from.
Kalshi and Polymarket quote the same events at different prices, in different places, on different screens. Ladr puts them on one fee-adjusted price ladder — and labels every rung with where its liquidity actually came from.
Most terminals show you one venue at a time. A few will merge them and hand you a single number. Ladr merges them and keeps the provenance — so you can see how much of any price is real depth on one exchange versus thin liquidity stitched together from two.
Kalshi and Polymarket on a shared price axis, fee-adjusted, YES and NO folded into one view. Each rung shows which venue it came from.
Every quote is labelled at the rung. No blended number without an origin — you always know what you'd actually be hitting.
Gapped feeds, excluded venues and untrusted books say so on the ladder, and the order ticket refuses the trade. Silence is not treated as data.
Prices and sizes are integers end to end. No rounding drift between what you see, what you send, and what fills.
Simulated and real trading run the same path, clearly separated and clearly labelled, so practice behaves like the real thing.
One key cancels every working order, and it keeps working when the feed is degraded. The stop is the part that can't be allowed to fail.
Venue names identify the exchanges Ladr connects to. Ladr is independent, and is not affiliated with, endorsed by, or partnered with any exchange. Ladr does not hold funds and does not take custody of assets.
No inflated numbers and no invented testimonials. This is what's working, what isn't, and what's next.
Ladr started because the tools available to prediction market traders don't show you the whole picture. You can watch one venue properly, or you can watch two badly. So we built the terminal we wanted: one ladder, both books, and no number on screen without a source behind it.
Ladr is software for viewing markets and placing your own orders. It is not investment advice, it does not manage money, and it makes no representation about trading outcomes.
Ladr isn't open yet. Leave an email and we'll get in touch when the private beta starts — that's the only thing we'll use it for.