Value Betting vs Arbitrage Betting: Which One Should You Use?
Arbitrage and value betting both exploit prices that are wrong, but they take opposite routes to a profit. Arbitrage backs every outcome at prices that fix the return in advance, so as long as every leg fills, the result is the same whatever happens. Value betting backs one side at a price that pays more than its true chance, and earns that edge across many bets with big swings along the way.
Arbitrage fixes the result of each bet before kickoff. Value betting gives you far more opportunities, in exchange for variance. Which suits you depends on your bankroll, your patience and where you trade.
An arbitrage (a "sure bet") exists when the best prices for every outcome of an event, taken from different places, imply probabilities that add up to less than 100%.
Take a two-way market. Bookmaker X offers Team A at 2.10. Polymarket sells Team B at 48¢, which is decimal odds of 2.08.
The arbitrage calculator splits the stakes for you, and our guide to arbitrage betting covers the method step by step.
A value bet takes one side only. If Over 2.5 goals trades at 55¢ and the fair probability is 57%, the expected value is 0.57 ÷ 0.55 − 1 = 3.6%. You don't lock anything in. This bet loses 43% of the time. You profit by placing many bets like it, because the wins pay more than the losses cost. Our guide to what a value bet is covers the basics.
Value betting's edge is real only across a large sample, and the sample is larger than most people think.
At 62¢, the median price of the value bets in our feed:
At 40¢ prices you need about two and a half times as many, because cheaper shares swing more. Pinnacle's guide to betting volume versus value makes the same point: volume is what takes luck out of a value bettor's results. An arbitrage needs one bet: if every leg fills, the result is known in advance.
This is why value bettors stake small. See the value betting strategy for how to size stakes so a losing run can't end your bankroll first.
According to Polymarket's fee documentation, takers pay a fee of 0.05 × price × (1 − price) per share on sports markets, or 5% × (1 − price) of what they spend. A resting limit order that fills as a maker pays nothing. Our Polymarket fees guide has the details.
For arbitrage, every leg you take on Polymarket pays the fee, so the margin has to cover it. In the example above, the 48¢ Polymarket leg pays 2.6% of its cost in fees. That's about 1.3% of the total stake, which cuts the locked profit from 4.6% to about 3.3%. A 2% arbitrage with the same leg keeps only about 0.7%.
For value betting, the fee is paid once, but value bets are small. The median value bet in our feed showed 1.89% EV, and Polymarket's taker fee needed 1.9% just to break even at the median price. 61% of the 5,135 value bets had no value left after the fee.
Either way, work out the edge after fees before you place anything.
Sportsbooks limit both kinds of player. An arbitrage bettor stands out quickly, because their bets are always against the market and often on soft lines. A consistent value bettor gets limited too, just more slowly. Our guide to betting limits explains how bookmakers decide.
Polymarket is an order book. You trade with other users, so there's no bookmaker deciding to cut your stake. The limit is the liquidity at your price. On the value bets in our feed, the best ask held a median of 107 shares and the top five price levels held about 4,000 shares.
That matters more for value betting than for arbitrage. Value betting needs thousands of bets to work, and an account limit at a sportsbook ends the run long before that. On an order book, the run can continue.
Choose arbitrage if:
Choose value betting if:
Use both if you want steady arbitrage profits alongside a longer-term value book. They draw on the same skill: knowing what a fair price is and what your costs are.
The OddsFantasy arbitrage finder lists arbitrage opportunities across bookmakers and Polymarket, and the arbitrage calculator splits your stakes. The positive EV finder compares Polymarket prices against Pinnacle's no-vig odds to find value bets. It can place qualifying ones automatically with your minimum EV, odds range, sports, maximum spread, minimum volume and stake.
Neither is better for everyone. Arbitrage locks in a profit on each bet but appears rarely and gets sportsbook accounts limited. Value betting offers far more opportunities, but needs thousands of bets before the edge shows.
It is when the margin clears every fee on every leg and you can fill all legs at your prices. On Polymarket, each leg you take as a taker pays 5% × (1 − price) of its cost, so thin arbitrages disappear once fees are counted.
Sportsbooks limit both, arbitrage bettors usually faster. Polymarket is an order book where you trade with other users, so it doesn't limit stakes for winning. Your constraint there is liquidity.
At 62¢ prices, a 2% edge needs about 4,100 bets before you can be 95% sure your results reflect the edge, and a 5% edge needs about 640. An arbitrage needs one, if every leg fills.
Yes. Many traders run arbitrage for steady returns and value betting for longer-term growth. Both start from the same question: what is the fair price, and what will this bet cost me?
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