Best Polymarket Arbitrage Scanners & Finders (2026)

Arbitrage is the cleanest edge in prediction markets. When the same event is priced differently on Polymarket and Kalshi, you can buy the cheap side, sell the expensive side, and lock in profit no matter what happens. The catch: those gaps close in seconds. You cannot find them by hand.

That is what an arbitrage scanner is for. It watches both order books in real time and pings you the moment a profitable spread opens. Here are the tools worth using in 2026, plus how to actually trade what they find.

How prediction-market arbitrage works

Polymarket and Kalshi often list the same question — "Will Bitcoin close above $X this hour?", the same election, the same game. Because they are separate markets with separate traders, the prices drift apart.

If Yes is trading at $0.48 on one platform and No on the same event is $0.49 on the other, you can buy both sides for $0.97 total and one of them is guaranteed to pay $1.00. That 3-cent gap is risk-free profit, minus fees.

The opportunities are real but small and fast. Scanners exist because the edge lives in the seconds between the spread opening and the market correcting itself.

What to look for in a scanner

• Real-time order-book data, not delayed quotes — a 60-second lag means the spread is already gone.
• Cross-platform coverage (Polymarket + Kalshi at minimum).
• Fee-aware math so the "profit" it shows is what you actually keep after taker fees.
• Instant alerts via Telegram, Discord, or push — you cannot stare at a dashboard all day.
• Liquidity/size info so you know whether the spread is worth $5 or $500.

The best Polymarket arbitrage tools in 2026

You can browse the full, continuously-updated list in the arbitrage tools category on yesornotool. These are the standouts:

1. Converge

Scans Polymarket and Kalshi order books on a tight loop and delivers a signal the moment prices diverge between venues. Clean, signal-first, and built specifically for the Polymarket–Kalshi spread.

2. ArbBets

An AI-driven scanner that hunts both pure arbitrage and positive expected-value (+EV) spots across Polymarket, Kalshi, and even sportsbooks. Useful if you want more than just risk-free arbs — it surfaces edges where the math is in your favor even without a guaranteed lock.

3. Polytrage

A real-time alert service that runs through a Telegram channel, pushing arbitrage opportunities on a short cycle. Good for people who would rather get a ping than watch a screen.

4. Automated arbitrage agents

Several tools now go past alerting and execute — detecting a spread and firing trades on both platforms in well under half a second. This is the only reliable way to capture the fastest, shortest-duration arbs (like Bitcoin hourly markets) where humans simply cannot click fast enough.

5. Open-source bots

If you can run a script, there are solid open-source Polymarket–Kalshi arbitrage bots on GitHub — several focused on the BTC 1-hour markets where mispricings are frequent. More work to set up, no subscription, full control.

Alerting vs. auto-execution: which do you need?

Alert-only scanners are best when you are trading larger, slower markets — elections, sports finals, macro events — where a spread can sit open for minutes. You get the ping, you place both legs by hand, you keep full control. Auto-execution bots are for high-frequency, short-duration markets where the spread vanishes in seconds. They are more powerful but riskier: you are trusting code with live capital across two platforms, and a failed leg can leave you unhedged.

Most people should start with alerts, learn what a real opportunity looks like, and only graduate to automation once they understand the failure modes.

The risks nobody mentions

Arbitrage is "risk-free" only on paper. In practice:

• Execution risk — you fill one leg and the other moves before you can complete it, leaving you exposed.
• Fees — since 2026 Polymarket charges taker fees on many markets, so a 2-cent spread might net almost nothing. Always check the math after fees.
• Withdrawal and capital lockup — your money is split across two platforms, and getting it back out takes time.
• Resolution mismatch — if the two platforms resolve a "same" event on slightly different terms, your hedge is not actually a hedge. Read both rule sets.

Bottom line

Arbitrage scanners turn a needle-in-a-haystack problem into a notification. Start with an alert-based tool like Converge or Polytrage, verify a few spreads by hand to learn the rhythm, and only automate once you trust your process. For the deeper strategy — including worked examples — see our Polymarket vs Kalshi arbitrage guide, and browse every scanner in the arbitrage category.