How time to resolution affects Polymarket prices

Filed 22 Jul 2026 · The Cent Signals desk

A market a year from its resolution date and the same market a day out can look very different, even without a single piece of decisive news. That is not because time itself moves a Polymarket price; nothing changes a price except a trade at a new level. It is because the amount and decisiveness of new information tends to increase as an event nears, and the range of outcomes still genuinely in contention tends to narrow. This guide covers that pattern as market mechanics, not as a signal about where any specific price is headed.

Time does not move a price; new information does

It is worth stating the mechanism plainly before describing the pattern: a Polymarket price only changes when a trade executes at a different level, the general mechanics covered in why do Polymarket prices move. There is no mechanical clock ticking a contract's price down or up purely from the passage of time, unlike a financial option's time-decaying extrinsic value under a pricing model. What does happen as a resolution date approaches is that the flow of relevant news picks up and its content becomes more decisive, and that is what produces the pattern this guide describes.

Uncertainty compresses as the range of outcomes narrows

The clearest version of this pattern shows up in multi-outcome fields. A wide field of candidates or teams a year from its resolution date can genuinely have a large number of plausible legs, each carrying some meaningful probability. As the underlying event unfolds, rivals are eliminated, polls consolidate, or a tournament bracket narrows, and the set of outcomes still genuinely in contention shrinks. That narrowing is reflected in the field's prices well before the event itself concludes: legs that were once plausible drift toward a fraction of a cent as the market reallocates probability toward the smaller set of names still realistically in contention, a pattern described for elections and sports fields specifically in how election markets price on Polymarket and how sports markets differ from political markets.

Why a market near resolution can still move sharply

Compression is not universal. A market sitting at an extreme close to its resolution date, where the field has already narrowed to a near-certain outcome, tends to see smaller absolute moves simply because little probability is left to reallocate. A market that remains genuinely close right up to the end, because the underlying question really is a toss-up, can still move sharply in its final hours, exactly the pattern short-duration crypto contracts are built around, described in how crypto price markets resolve on Polymarket. Time to resolution shapes how much uncertainty is available to compress; it does not force a market to become quiet on its own.

Frequently asked questions

Does a Polymarket price change just from time passing, with no news?

Not by itself. A price only moves when someone trades at a new level, so time alone does not move a contract the way a countdown clock would. What changes as a resolution date approaches is the flow of new information: more of it arrives, more of it is decisive, and each piece is more likely to move the price by a larger amount than the same kind of news would earlier in the market's life.

Why do long-shot legs in a wide field often drift toward zero as the resolution date nears?

Because the number of outcomes still genuinely plausible narrows as an event approaches, so probability mass tends to concentrate on fewer legs. A candidate or team that was one of many plausible names a year out becomes increasingly unlikely as rivals are eliminated or pull ahead, which is reflected in that leg's price drifting toward zero well before the event itself concludes.

Does a market close to resolution move less than a market far from resolution?

It depends on how settled the outcome already looks, not on the time remaining by itself. A market sitting at an extreme close to its resolution date, where the outcome looks all but decided, tends to see smaller price moves because there is little probability left to reallocate. A genuinely close market can still move sharply right up until the moment it resolves, regardless of how little time is left.

Is this the same thing as time decay in an options contract?

The analogy is loose and worth treating carefully. An option's time decay reflects a mechanical loss of extrinsic value purely from the passage of time under a pricing model. A Polymarket contract has no equivalent mechanical decay; its price only changes when new information arrives and someone trades on it. The similarity is limited to the observation that uncertainty compresses as a resolution date nears, not to any shared pricing formula.

Where does the compression in uncertainty actually come from?

From the underlying event narrowing its own range of plausible outcomes, not from the market mechanism itself. A campaign eliminates candidates over time, a tournament eliminates teams round by round, and a threshold question's remaining time window shrinks. Each of those is a real-world change that the market prices in as it happens, rather than a built-in feature of the contract.