How to Read Prediction Market Odds

Price Equals Probability

In prediction markets, the price of a contract directly represents the market's estimated probability. A YES contract trading at ¢72 means the crowd estimates a 72% chance that event occurs.

This is fundamentally different from sports betting odds, which include bookmaker margins (the "vig"). Prediction market prices are purer probability signals because the market itself is the price-setting mechanism — no bookmaker is taking a cut on both sides.

YES and NO Shares

Every prediction market has two sides: YES and NO. If YES trades at ¢72, then NO effectively trades at ¢28 (since they sum to ¢100). Buying YES at ¢72 means you risk ¢72 to profit ¢28 if you're right. Buying NO at ¢28 means you risk ¢28 to profit ¢72.

This symmetry means there's always a way to express your view — if you think an event is less likely than the market suggests, buy NO rather than waiting for the price to drop.

Cross-Platform Comparison

The same event often trades at different prices on Polymarket and Kalshi. These differences reflect different information, different participants, and different fee structures.

For example, a political event might trade at ¢65 on Polymarket and ¢60 on Kalshi. This 5-cent gap could mean: one platform's users have information the other's don't, liquidity differences are affecting price discovery, or fee structures are creating a natural spread.

Comparing odds across platforms is one of the most valuable analytical tools available — it reveals where the market disagrees with itself.

Reading Price Movements

Sudden price movements signal new information. A contract jumping from ¢50 to ¢70 in an hour means the market is rapidly repricing the probability based on new data — a poll release, a news event, or a large informed trade.

Gradual drift is different — it suggests slow consensus building or positional accumulation. Watching the speed and magnitude of price changes helps distinguish between information-driven moves and noise.

Spotting Mispriced Markets

A market is "mispriced" when the contract price doesn't reflect the true probability. This can happen because of low liquidity (not enough participants for efficient price discovery), recency bias (overreacting to recent news), or platform segmentation (different user bases on different platforms).

The most reliable signal of mispricing is a persistent price gap between platforms. If Polymarket has an event at ¢65 and Kalshi has it at ¢55, and the gap persists for hours, someone is wrong — or there's an arbitrage opportunity.

ProfitLabs Odds Comparison

ProfitLabs displays real-time odds from both Polymarket and Kalshi side by side. Price gaps are flagged automatically with signal badges, so you can quickly identify where platforms disagree and by how much.