Venues
Prediction market venues compared for arbitrage
Each venue charges fees differently, settles differently and holds different depth. That is where spreads come from and what decides whether you can trade them. Here are the five venues ArbSonar scans, with live numbers from the latest scan.
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Scan at 18:20 UTC · refreshed about once a minuteAt a glance
| Venue | Type | Taker fee in the scanner | Markets scanned | Live spreads |
|---|---|---|---|---|
 Polymarket | Crypto order book · Polygon | Per-market schedule (0–7% rate) | 249,788 | 615 |
 Kalshi | CFTC-regulated exchange · USD | 0.07 × P × (1 − P) | 140,572 | 336 |
 Limitless | Crypto order book · Base | Not published; shown before fees | 1,355 | 39 |
 Predict.fun | Crypto order book · BNB Chain | Rate × min(P, 1 − P), mostly 2% | 15,450 | 358 |
 Opinion | Crypto order book · BNB Chain | Estimated 0.04 × P × (1 − P) | 198 | 8 |
PolymarketPolymarket is the largest crypto prediction market and the venue most cross-venue spreads touch. Here is what matters when one leg of your trade sits on it: how fees are charged, how deep the book really is, how markets resolve, and which spreads are open right now.Polymarket guide ↗KalshiKalshi is a US exchange regulated by the CFTC, so its contracts, account rules and fees work differently from crypto venues. Those differences are exactly where spreads open up, and where they can turn against you.Kalshi guide ↗LimitlessLimitless is a prediction market on Base with a large share of short-dated crypto price markets. Its books are thinner and its spreads wider than on the big venues, which makes it a frequent source of eye-catching ROI and of disappointing fills.Limitless guide ↗Predict.funPredict.fun is a BNB Chain prediction market that mirrors many Polymarket and Kalshi events and says so in its data. That makes it the cleanest source of cross-venue pairs we scan: the match is by market ID, not by guessing from the wording.Predict.fun guide ↗OpinionOpinion is a BNB Chain prediction market from Opinion Labs, launched in October 2025. It lists fewer markets than the big venues, but its macro and crypto topics overlap with Polymarket often enough to produce some of the largest spreads in the scanner.Opinion guide ↗