The Reference
for Odds
See the real price on any market before you trade it. We put Polymarket, Kalshi, and Gemini side by side in real time, so you always know which platform has the edge — not just what one of them shows you.
Covers 8,344 live markets across prediction markets and sportsbooks today.
Exchange vs Sportsbook, Side by Side
32 outcomes on "NFL Champion 2027" are priced by both a prediction-market exchange and real sportsbooks (BetMGM and others). Right now they differ by as much as 1.8 points on "Seattle Seahawks" — the same outcome, two different prices. Live data, pulled from each venue at build time.
NFL Champion 2027
1 exchange • 4 sportsbooks| Outcome | Best Exchange | Best Sportsbook | Edge |
|---|---|---|---|
| Los Angeles Rams | 15.5% Polymarket | 15.4% (+550) DraftKings | 0.1pt |
| Buffalo Bills | 7.5% Polymarket | 9.1% (+1000) BetMGM | 1.6pt |
| Baltimore Ravens | 6.9% Polymarket | 7.7% (+1200) FanDuel | 0.8pt |
| Kansas City Chiefs | 6.8% Polymarket | 5.6% (+1700) FanDuel | 1.2pt |
| Seattle Seahawks | 6.5% Polymarket | 8.3% (+1100) BetMGM | 1.8pt |
| Philadelphia Eagles | 4.3% Polymarket | 5.3% (+1800) BetMGM | 1.0pt |
| San Francisco 49ers | 4.2% Polymarket | 5.0% (+1900) DraftKings | 0.9pt |
| Denver Broncos | 4.2% Polymarket | 4.8% (+2000) BetRivers | 0.6pt |
+24 more outcomes on the full comparison page.
Calculators & Analysis
Odds Converter
Convert between American, Decimal, and Fractional odds formats instantly
Parlay Calculator
Calculate parlay odds, payouts, and implied probabilities for multi-leg bets
EV Calculator
Find expected value on any bet to identify profitable opportunities
Vig Calculator
Calculate the bookmaker's margin and find the true odds on any market
DFS & Pick'em
Contest EV Calculator
Calculate expected value of any DFS contest
Pick'em Payout Calc
Exact payouts for PrizePicks, Underdog, Pick6
Entry Optimizer
Find the optimal pick count and entry type
Fantasy Scoring
Calculate fantasy points across DK, FD, Yahoo
Casino
Game Comparison
Compare house edge across casino games
Wagering Requirements
True value of casino bonuses after wagering
Blackjack Strategy
Generate basic strategy charts for any rule set
Expected Loss
Calculate expected cost per casino session
Top-Rated Platforms by Category
The top-rated platforms across every category, ranked by data.
Best Sportsbooks 2026
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Guides, reviews, platform comparisons, and interactive tools across every betting and prediction category — plus live dashboard features like on-chain whale tracking.
Sports Betting
How odds are made, how to read them, and the data infrastructure behind sports betting.
37 guides
Browse guidesPrediction Markets
What prediction markets are, how to read them, and platform-specific performance data.
42 guides
Browse guidesComparisons
Data-backed comparisons of platforms, sportsbooks, and odds quality.
15 guides
Browse guidesDaily Fantasy
DFS strategy, platform comparisons, and bankroll management for daily fantasy sports.
37 guides
Browse guidesOnline Casino
House edge analysis, game guides, and data-driven casino strategy.
42 guides
Browse guidesPoker
Poker strategy, odds calculation, and platform reviews with real data.
19 guides
Browse guidesLottery
Expected value analysis, odds breakdowns, and historical data for major lotteries.
5 guides
Browse guidesF1 Model
Elo-based championship predictions, circuit-specific win probabilities, and teammate pace analysis.
3 guides
Browse guidesWhale Tracker
Live on-chain trade data
Follow 7,000+ tracked wallets — live on-chain trades, trading-style profiles, whale alerts.
Open Whale TrackerEducation & Guides
Sports Betting
Gambling Taxes 2026: Federal Rules for Every Vertical
Federal and state tax rules for sports betting, poker, DFS, and prediction markets — W-2G thresholds, the OBBBA 90% loss cap, and pro vs. rec filing.
Sports Betting Legal States 2026: Where Can You Bet?
Complete guide to sports betting legalization by state. 38 states plus DC have legal sports betting as of March 2026. Live status, launch dates, and available sportsbooks.
Prediction Markets
Kalshi's Circuit Split Explained: Third Circuit vs. SDNY
Third Circuit says federal law preempts NJ's gambling law for Kalshi. SDNY ruled the opposite three months later. Here's the split explained.
Minnesota's Prediction Market Ban (SF 4760): What It Actually Says
Minnesota's SF 4760 makes operating or advertising a prediction market a felony starting August 1, 2026. Here's what the law covers, what it doesn't, and where the CFTC lawsuit against it stands.
Daily Fantasy
How to Build a DFS Optimizer: The Math Explained
How DFS lineup optimizers actually work: linear programming, integer constraints, salary caps, and the practical steps to build or evaluate one.
Monkey Knife Fight Review: Why It Shut Down (2026)
Monkey Knife Fight is defunct. Here's what the DFS prop platform was, how Bally's $90M acquisition led to its 2023 shutdown, and where users went.
Online Casino
Beginner's Guide to Blackjack: How to Play in 2026
Learn blackjack from scratch: card values, hit/stand/double/split, how a hand plays out, and the one strategy chart that cuts the house edge to 0.5%.
Beginner's Guide to Poker Hands: Full Ranking Chart
Every poker hand ranked from royal flush to high card, with real odds for each. The complete beginner's chart for Texas Hold'em and other poker games.
Poker
Best Online Poker Sites 2026: Traffic, Rake & Bonuses
Best online poker sites in 2026 ranked by player traffic, rake structure, tournament series, and shared liquidity. WSOP.com, BetMGM Poker, and BetRivers Poker compared.
BetMGM Poker Review 2026: Network, Rake & Software
BetMGM Poker review: 3-state shared network, Borgata/partypoker skins, rake structure, and tournament schedule, rated across 6 categories for 2026.
Lottery
Is It Legal to Buy Lottery Tickets Online? 2026 State Guide
State-by-state guide to legal online lottery ticket sales, licensed couriers, and offshore scams. Full iLottery state list, verified July 2026.
Jackpocket Review 2026: Fees, States & DraftKings
Jackpocket review: fee breakdown, ~17-state coverage, DraftKings acquisition impact, and lottery game selection, rated across 6 categories.
Head-to-Head Comparisons
Best Sportsbooks 2026: Ranked by Odds & Bonuses
2026 sportsbook rankings: FanDuel, DraftKings, BetMGM, Caesars, and bet365 compared on odds, bonuses, app quality, and payout speedCaesars Sportsbook Review 2026
Caesars Sportsbook review: legacy brand with Caesars Rewards integration, competitive odds on major sports, and available in 20+ statesDraftKings vs FanDuel: Which Sportsbook Has Better Odds in 2026?
DraftKings vs FanDuel compared on odds quality, vig, market selection, mobile experience, and promotionsFanDuel Sportsbook Review 2026: Odds Quality and Market Analysis
FanDuel review: consistently competitive odds, clean mobile experience, strong promotions budgetKalshi vs Robinhood Prediction Markets: Which Is Better?
Compare Kalshi vs Robinhood prediction markets side by side — fees, regulation, market selection, and usabilityBetMGM Sportsbook Review 2026
BetMGM sportsbook review: strong casino integration, competitive odds, and large welcome bonuses in US sports bettingThe odds, in your inbox.
One email a week on where prediction markets and sportsbooks disagree — and why it matters.