Arbitrage Bet Finder: Free Scanner for Polymarket & Kalshi (2026)
Use ArbBets as your arbitrage bet finder — scan Polymarket, Kalshi, and Opinion for fee-adjusted arbs. Free tier, live calculator, and API for 100+ daily opportunities.
Last updated: August 2026 — This guide is the primary home for arbitrage bet finder queries. For a step-by-step tutorial on how finders work, see the arbitrage bet finder how-to.
What is an arbitrage bet finder?
An arbitrage bet finder is software that scans multiple betting or prediction-market platforms at once and alerts you when the same event is mispriced enough to guarantee profit. ArbBets matches 990+ markets across Polymarket, Kalshi, and Opinion and surfaces 100+ fee-adjusted opportunities per day.
- Real-time scanning — orderbook-aware prices, not stale mid quotes
- Fee-adjusted ROI — Kalshi taker fees included before you trade
- Cross-platform matching — semantic pairing so "Fed cuts in June" on Kalshi links to the same event on Polymarket
Try the live scanner on our free arbitrage finder or size positions with the Kalshi arbitrage calculator.
Free arbitrage bet finder
A free arbitrage bet finder lets you explore arbitrage mechanics without a paid subscription. ArbBets offers a free tier that shows live Polymarket–Kalshi spreads, plus educational guides and a prediction market arbitrage hub.
- No credit card — sign up to preview live cross-market arbs
- Same matching engine — free and Pro tiers use identical event pairing
- Upgrade path — Pro ($149/mo) adds alerts, faster refresh, and full market coverage; Premium ($299/mo) adds the arbitrage betting API
Start free: Polymarket–Kalshi arbitrage finder.
Arbitrage bets finder — how ArbBets compares
An arbitrage bets finder must cover more than one venue, adjust for fees, and refresh fast enough to act. Legacy sportsbook scanners (OddsJam, RebelBetting) rarely include prediction markets; ArbBets is built for the Polymarket ↔ Kalshi ↔ Opinion corridor.
| Feature | ArbBets | Manual tabs |
|---|---|---|
| Platforms | Polymarket, Kalshi, Opinion | Whatever you open |
| Markets monitored | 990+ matched pairs | 10–20 realistic |
| Fee-adjusted ROI | Yes (Kalshi 7% model) | Error-prone |
| API for bots | Premium plan | DIY only |
Deep-dive: best prediction market arbitrage tools (2026).
How to use an arbitrage betting finder
1. Fund accounts on each platform
- Polymarket — USDC wallet on Polygon
- Kalshi — USD via bank or debit (US residents)
- Opinion — crypto-based, similar to Polymarket
2. Configure alerts and filters
Set minimum ROI (3%+ after fees recommended), choose categories (politics, crypto, sports events), and enable push notifications on Pro.
3. Verify, size, execute
When an alert fires:
- Confirm the event matches exactly on both legs
- Size with the arbitrage betting calculator or in-scanner investment tool
- Place the less liquid leg first (often Kalshi), then the second immediately
4. Track and scale
Log gross spread, fees, fill price, and net PnL. Review weekly; politics and macro categories tend to produce the most cross-platform gaps.
For the full strategy walkthrough, read the prediction markets arbitrage guide.
Arbitrage betting finder vs sportsbook scanners
Sportsbook arbitrage finders hunt surebets across DraftKings, FanDuel, and Pinnacle. Prediction market arbitrage finders hunt binary $0/$1 contracts on peer-to-peer exchanges — wider spreads, no winner limits, and 1–8% typical ROI after fees.
ArbBets covers both: Basic tier includes sportsbook alerts; Pro unlocks the full prediction-market scanner. Compare plans on pricing.
Tools and resources
- Arbitrage calculator — stake sizing for 2-way and 3-way arbs
- Arbitrage betting API docs — build bots with normalized orderbook data
- Arbitrage betting calculator guide — when to use calculators vs scanners
- How arbitrage bet finders work — educational tutorial (not the primary tool page)
- Arbitrage betting explained — fundamentals of surebet math
Frequently asked questions
What is the best arbitrage bet finder in 2026?
For Polymarket, Kalshi, and Opinion cross-platform scanning with fee-adjusted ROI, ArbBets is the most comprehensive dedicated finder. Sportsbook-only tools miss the prediction-market corridor where the widest spreads currently live.
Is there a free arbitrage bet finder?
Yes. ArbBets offers a free tier with live Polymarket–Kalshi spreads at /polymarket-kalshi-arbitrage. Paid Pro unlocks full three-platform coverage and alerts.
How is an arbitrage bets finder different from a calculator?
A finder discovers opportunities automatically; a calculator sizes stakes for an opportunity you already spotted. Use both: finder to scan, calculator to confirm profit at your bankroll.
Conclusion
Whether you search for an arbitrage bet finder, free arbitrage bet finder, or arbitrage bets finder, the workflow is the same: match events across venues, confirm fee-adjusted ROI, execute both legs fast. ArbBets automates discovery so you can focus on execution.
Ready to scan live opportunities? Open the prediction markets arbitrage hub or start with the free Polymarket–Kalshi finder.