Trade Checker

Is that spread real?

Paste any Kalshi, Polymarket or Polymarket US event, from any scanner, screenshot or group chat. It goes through the same structure check, the same live order book and the same fee math this scanner runs before anything reaches its own feed.

Three free checks a day. No account, no card.

The structure

Can exactly one listed outcome win, or does one bracket contain another? If that cannot be proven from the market rules, there is no arbitrage, whatever the prices add up to. Most of what other tools surface fails here.

The size that is actually there

Not the best quote, the depth. A three cent edge on 20 contracts is not the same trade as a three cent edge on 2,000, and a scanner that quotes you the top of book is not telling you which one you have.

The fees

Each platform's own published fee formula, applied at the size resting right now. A large share of spreads that look positive gross are negative net, and that is the whole difference between a trade and a lesson.

This is a tradeThe structure holds, the size is there and it clears its fees. You get every leg, the price, the resting size and what it nets.
Sound, but no edgeExactly one outcome can win, so the structure is real, but at the prices and sizes resting right now it does not clear fees. That can change minute to minute.
Not a tradeThe most useful answer. The event fails the structure check, and you get the specific reason. If another tool showed you a spread here, this is the one to look at twice.

Checking more than three a day

A free account raises it to ten a day and gives you the live spread list as well. Pro removes the daily limit and unlocks every leg, price and link on the scanner itself.

Create a free account See pricing