How the scanner works
Compare high-probability Polymarket markets without treating them as guaranteed.
What 99market finds
99market scans active Polymarket outcomes whose favored side is priced from 98¢ through 99.5¢ and whose market has at least $1,000 in reported volume. The scanner ranks qualifying markets by simple annualized return, then displays price, potential profit per $100, time remaining, volume, liquidity and a rule-quality score. The result is a focused list of high-probability contracts rather than a broad feed of every prediction market.
Why APR matters
A contract bought at 98¢ can return $1 if it resolves in your favor, a gross gain of roughly 2.04% on the purchase price. Time changes how that return compares with another market. 99market annualizes the simple return over the scheduled time to resolution, making a market ending tomorrow easier to compare with one ending next month. APR is a comparison tool, not a forecast or guaranteed yield.
What to review before trading
Open the original market and read the complete resolution rules. Confirm the primary source, cutoff time, time zone and settlement condition. Then inspect the order book: reported volume does not guarantee that enough liquidity exists at the displayed price. Sports cancellations, election certification, data revisions, exchange timestamps and weather-station rules can all change how an apparently straightforward market settles.
The risk of near-$1 contracts
A high contract price reflects the market's current implied probability, not certainty. One losing trade purchased at 98¢ can erase the 2¢-per-share profit from roughly 49 winning trades. Capital may also remain locked while a market is clarified or settled. Resolution disputes, thin liquidity, fees and a later payout date can reduce the return shown by a simple APR estimate.
Explore by strategy
Start with the educational guides for the terminology and trade-offs behind this filter. Learn how traders use the “Polymarket bonds” analogy, examine the mathematics of the 99-cent strategy, compare markets ending soon, or calculate a custom APR that includes fees and settlement delay.
How the data is updated
The feed is built from Polymarket's public Gamma API and cached so the latest successful snapshot can be rendered directly in the page HTML. The visible timestamp shows when the calculation was made. Prices, liquidity and market status can change between refreshes, so the Polymarket market page remains the source to verify immediately before any decision.