EV — expected value — is the only honest way to compare two gambling products. Everything else is feel. If you bet long enough on negative-EV products, you go to zero. If you bet long enough on neutral or positive-EV products, you have a chance. So which has better EV: a sportsbook prop bet or an on-chain perp trade?
We will do the math. Then we will tell you what the math actually means in practice.
the EV formula, refreshed
For a sportsbook prop bet at -110 odds with a true 50/50 outcome: you risk $110 to win $100. EV per dollar is (-$110 × 0.5 + $100 × 0.5) / $110 = -$5/$110 = -4.5%. That is the vig. You are losing 4.5 cents per dollar on average even when the line is perfectly fair.
Prop bets are rarely -110. Player props commonly run -115 / -115 (8.6% implied hold), and same-game parlay legs often land at effective -125 / -125 or worse once you factor in correlation re-pricing. The implied hold on a 3-leg SGP is regularly 15–25%.
the perp EV formula
A perp trade does not have a fixed payout, so EV looks different. You pay an open fee, a close fee, and funding while you hold. On a typical on-chain perp DEX, that totals 0.05% to 0.2% per round-trip on a position held for a few hours. There is no vig on the line itself — the price is the market price.
On uponly.win the math is cleaner still. Open fee: 0. Close fee on a losing trade: 0. The only extraction is a small variable cut on net winnings. If your trade is at break-even, you pay nothing. If your trade loses, you pay nothing on top. EV per trade is dragged only by funding (which can be positive for you) and a small slice off your wins.
a concrete comparison
Let us say you have $1000 and you want to make 100 random 50/50 bets over a year.
- Scenario A: 100 prop bets at -110, $10 stake each. Expected loss from vig: 100 × $10 × 4.5% = $45. After variance, you finish around -$45.
- Scenario B: 100 SGP legs at effective -120, $10 stake each. Expected loss from vig: 100 × $10 × ~9% = $90. After variance, around -$90.
- Scenario C: 100 perp trades on uponly.win, $10 collateral, 75x leverage, 50/50 directional. Expected loss from fees on losers: $0. Expected drag on winners: small. After variance, you finish near $0 plus or minus the variance.
The structural difference is the absence of vig. You can still lose on perps — variance is real and leverage amplifies it — but you are not paying a guaranteed tax on every trade.
where prop bets have an edge
EV is not the only axis. Prop bets have advantages perps cannot replicate.
- Fixed payouts. You know exactly what you win before you bet. Perps re-price continuously.
- Asset specificity. You can bet on Patrick Mahomes passing yards. You cannot bet on Patrick Mahomes passing yards as a perp.
- Defined time horizon. The bet ends at the final whistle. Perps can be held forever, which sounds nice but creates new decisions.
- Information asymmetry. If you have an edge on a niche prop because you watch a lot of WNBA, the line is often softer than a BTC market.
If you have a real edge on prop bets — and some people do — the vig is the price of admission. The question is whether your edge is bigger than the vig. For most bettors, it is not.
where perps win on EV
For users without a specialized prop-bet edge, the EV comparison is not close.
- No vig on the line. The price is the market.
- No closing-line value penalty. There is no closing line.
- No book limits. The market does not care if you are profitable.
- On uponly.win, no fees on losses. Variance is variance, not variance plus a tax.
the closing-line value problem
Sharp sports bettors talk constantly about closing-line value. The closing line is the truest market price. If you can consistently beat it, you have edge. If you cannot, you do not. The grim secret is that even bettors who beat the closing line by 2–3% can lose to vig if they are not careful.
Perps do not have this problem because there is no closing line. The market price is always live. You are not trying to predict where the line moves to, you are trying to predict where the price moves to. That is a more honest game.
variance is still real
EV is the long-run number. In the short run, variance dominates everything. A 75x perp position is variance-heavy by construction. You can have positive expected value on average and still go to zero in 20 trades if you size badly. This is true for prop bets too — bankroll mismanagement kills more bettors than bad picks.
Read betting bankroll rules applied to perp trading for the unit-sizing math. EV without bankroll discipline is theoretical.
the meta point
Sportsbooks are profitable because vig is built into every line. Players who churn lose to vig regardless of skill. Perp DEXes are profitable because liquidity providers earn spread and fees. There is no equivalent of vig because there is no internal book taking the other side. uponly.win does not have a book at all — we route to on-chain markets on Avantis and only take a cut of winnings.
If you are a prop-bet enthusiast with a specialized edge, keep doing what you are doing. If you are a degen who likes the action and has been churning -8% per cycle at the sportsbook, perps are mathematically a better home for that energy.
try the math yourself
Pick a stake size you are comfortable losing. Run 10 prop bets and 10 perp trades over a month. Track every result. Compare net P&L against expected vig drag. The numbers will be more honest than any blog post. Start your perp side at uponly.win with $20.