The Line

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.

The Line · 2026-08-19

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.

The Line · 2026-08-17

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.

The Line · 2026-08-14

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.

The Line · 2026-08-12

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.

The Line · 2026-08-10

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.

The Line · 2026-08-07

Prediction Markets History: From Iowa to Polymarket

The forty-year path from a University of Iowa experiment to billion-dollar event exchanges, told plainly.

The Line · 2026-08-05

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.

The Line · 2026-08-03

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.

The Line · 2026-07-31

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.

The Line · 2026-07-29

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.

The Line · 2026-07-22

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.

The Line · 2026-07-20

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.

The Line · 2026-07-17

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.

The Line · 2026-07-15

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.

The Line · 2026-07-13

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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