Prediction markets, read straight.
The clearest guide on the internet to prediction markets — Kalshi, Polymarket, and how to read the odds. Free education; the live board is the product.
Latest from The Line
CFTC Prediction Market Rules: 3,500 Comments, Two New Drafts
From a March advance notice to two drafts at OIRA in September: a plain-English map of the CFTC's prediction market rules.
Base Rates in Prediction Markets: Read Odds From the Outside In
Before you judge any price on an event contract, ask how often things like this have happened before. Most people skip that step.
Kalshi In-Game Swing Tests: Six Variants, All Negative
We paper-traded a low-priced contract swing rule on Kalshi sports six ways. Every version came back negative, and the math explains why.
Voided Contracts: What Happens When a Market Can't Resolve
Most contracts settle YES or NO. Some end in a gray zone, and the rules written before the first trade decide what happens.
NFL Prices vs Final Scores: 70-Cent Favorites Won 75%
We checked Friday's NFL exchange prices against the final scores. On one small slate, the prices came close to what happened.
Kalshi vs Polymarket NFL: Polymarket Cheaper on 75 of 79
One snapshot, 103 lines, three venues: how fees and market structure put different prices on the same NFL outcome.
CFTC Public-Interest Review: What It Means for Event Contracts
A review doesn't ban a contract. It's a regulatory pause, and knowing how one works explains a lot about which markets exist at all.
Same-Game Combo Correlation: Why the Legs Aren't Independent
Multiplying leg probabilities only works when outcomes are unrelated. Inside a single game, they rarely are.
Combo Contracts: Why Correlated Legs Don't Simply Multiply
Same-game legs move together, so multiplying their probabilities gives the wrong price for the whole combo.
Block Trades on Prediction Markets: How Big Hedges Get Done
How a large position gets traded at one negotiated price, and why the exchange still never takes a side.
Open Interest vs Volume: Activity Is Not Commitment
Volume shows how much changed hands. Open interest shows how much is still held. The two numbers answer different questions.
Polymarket vs Kalshi NFL: Cheapest on 61 of 105 Lines
A pre-kickoff snapshot of 105 NFL lines on three venues, and what fee formulas and vig do to the price a buyer actually pays.
LSU's $3M Kalshi Hedge: How Coaching-Bonus Block Trades Work
Five off-exchange block trades turned Lane Kiffin's title bonus into a hedged position on Kalshi. Here is how that works.
Why a Prediction Market Is an Exchange, Not a House
On a prediction market you trade against another person, not the venue. That one fact changes how prices move and who profits.
Cheap Football Contracts: 0.6% Hit a 1.5% Price
Delta Arc's football backtests show cheap contracts are priced close to right — the spread and fee are where the cents go.
Sports Event Contracts vs State Gambling Law, Explained
When you trade a contract on a game, are you buying a financial product or placing a sports bet? The answer decides who regulates it.
NFL Favorites Went 8 of 14: Reading Friday's Prices
Scoring Friday's NFL contract prices against ESPN's final scores, and what the gap between them does and does not tell you.
Where a Market Price Comes From: Buyers, Sellers, the Order Book
A price is not a verdict handed down from above. It is the last thing a buyer and a seller agreed on, and it moves for a reason.
Polymarket Cheapest on 67 of 110 NFL Lines (Oct 16)
Three venues, the same games, one frozen frame before kickoff: what each charged and why the structure behind the price matters.
Kalshi's $500,000 Goat-Grazer Hedge That Paid Nothing
A goat-grazing firm bought regulatory protection on Kalshi. The legislature acted, and the hedge settled worthless — exactly as intended.
Kalshi Fees Peak at 1.75% at 50/50: Maker vs Taker
Prediction market prices come from a two-sided order book. Here is how maker and taker fees work, and why the posted rate is not the bill.
NFL Favorites Won 10 of 13: What Friday's Prices Knew
Scoring Friday's Oct 9 NFL contract prices against the final whistle, one weekend of results at a time.
Hedging a Performance Bonus With Event Contracts
Your bonus often rides on a number you cannot steer. Here is how event contracts let you take a position against that number.
The First 60 Seconds: How Markets Price Breaking News
A plain-English look at what happens to a contract's price in the minutes after a headline lands, and why it behaves that way.
NFL Prices: Kalshi vs Polymarket vs DraftKings, 1.3c Apart
The same game, three venues, three prices. A pre-kickoff snapshot of how NFL outcomes get priced across two exchanges and a sportsbook.
How a 2026 Midterm Election Contract Settles
Before a single vote is counted, an election contract has already decided which result counts and who is allowed to declare it.
Backtest vs Forward Test: Judging a Market Strategy
Two honest ways to judge a prediction-market idea — and why the one that looks best on paper is usually the one that lied to you.
Missouri vs Event Contracts: Why 'Not the House' Matters
Missouri says you cannot rename a sports bet into a legal one. Kalshi says it never took the bet at all. Both can be sincere.
Why Multi-Leg Contracts Cost More Than Their Legs
Probabilities multiply, spreads and fees repeat on every leg, and correlation bends the rest — why a combo's price never matches its parts.
Mattress Mack's $516K Kalshi Hedge, Explained
How a Houston furniture promotion became a plain case study in hedging business risk on a prediction market instead of a sportsbook.
Robinhood Event Contracts: How They Actually Work
Robinhood didn't build a prediction market. It built an on-ramp to one, and that distinction explains almost everything about how these contracts behave.
What a 65-Cent Prediction Market Price Really Means
A prediction-market price is a probability wearing a dollar sign. Here is how to read it without fooling yourself.
Are US Prediction Markets Legal? Kalshi vs the CFTC
The legal status of prediction markets in the US comes down to one agency, one law, and a fight over whether an election is a commodity.
Why Prediction Markets Often Beat the Polls
Polls ask people what they think. Markets ask people to put money behind it, and that changes almost everything.
Prediction Market Liquidity: Why Thin Books Lie
A prediction market price is only as trustworthy as the money standing behind it, and liquidity is how you measure that.
Prediction Markets History: From Iowa to Polymarket
The forty-year path from a University of Iowa experiment to billion-dollar event exchanges, told plainly.
Prediction Markets Explained: Why They're Everywhere Now
Contracts that pay out on real-world events went from academic curiosity to mainstream news feed in a few short years. Here is how they work.
Election Markets: How to Read Odds Without Getting Fooled
An election market price is a probability, not a prediction. Here is how to read it, and where new readers go wrong.
Kalshi vs Polymarket: Why Prices on the Same Bet Diverge
Two venues, one question, two prices — a plain-English guide to why prediction markets disagree and what the gap is really telling you.
Line Movement Explained: Why Market Odds Shift
When a market's odds move, someone changed their mind with money on the line. Here is how to read what that move is actually saying.
How Prediction Markets Price a Yes/No Event
A contract that pays a dollar if something happens will trade at whatever the crowd thinks the odds are, and that price is the whole game.
Kalshi vs Polymarket: What Actually Separates Them
One is a regulated US exchange, the other a crypto-native global venue. The difference shapes who can trade, what settles, and how prices behave.
Poll, Bet, or Signal? What Prediction Markets Really Are
A prediction market looks like a poll, trades like a bet, and behaves like a signal. Only one of those is what it actually is.
Susquehanna, Robinhood, Rothera: The New Plumbing
A 500 million dollar hedging book and a licensed exchange show prediction markets turning into financial plumbing, not a sideshow.
Prediction Markets vs Sportsbooks: The Real Difference
They both look like odds on a screen, but one is a marketplace and the other is a house. That changes everything.
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