Order Books and Liquidity

What Settlement Does to a Position You Still Hold

Holding to settlement means no exit, no spread on the way out, and a payout decided by a rule. The mechanics, and the ways they surprise people.

ProudGlobeHead Markets DeskSeptember 17, 20263 min read

A line arriving at a solid wall and stopping

Everything about an event contract converges on one moment. Trading stops, a rule is applied, and every position becomes a dollar or nothing.

The mechanics

Close. Trading ends at the stated time. After this you cannot exit, whatever happens.

Observation. The settlement source publishes, or the event occurs, at the moment named in the rules.

Determination. The venue applies the rule, or on an on-chain venue an answer is proposed and a challenge window opens. How Polymarket resolves.

Payout. Winning contracts pay one unit; losing ones pay nothing. On some venues this is automatic; on others you redeem.

What holding to settlement gets you

No exit spread. Settling out pays no spread on the way out, which on a wide market is a real saving. What a spread costs you.

No exit slippage. Your whole position settles at the same value regardless of size.

Certainty of price. Zero or one hundred. No worrying about whether you can get out at a reasonable level.

What it costs you

Capital for the full term. Committed until settlement, earning nothing. Capital lockup.

No ability to change your mind. New information after close is unusable.

Full exposure to resolution risk. If the rule produces an unexpected answer, you take it. Someone who exited early did not. Resolution risk.

Settlement delay. On venues with a proposal and challenge process, the capital stays committed past the event itself. The market lifecycle.

One filled box beside one empty box — One dollar or nothing. There is no third box.

The surprises

The obvious answer arrives before the official one. A result everyone knows may not be certified for weeks. The contract does not care what everyone knows.

Ties at the threshold. A figure landing exactly on the strike resolves by a rule in the terms, and the rule is not always what you would guess.

First print versus revision. The published-at-the-time value settles it. A later revision does not reopen anything. Where settlement numbers come from.

Voids. If the source never publishes, some contracts void and return capital. Your forecast was irrelevant and your capital was locked the whole time.

One leg voids and the other does not. For anyone holding both sides of a cross-venue pair, this is the genuinely dangerous case: a hedged position becomes an outright one without your involvement. It is a specific reason to prefer pairs whose fallback clauses match. Resolution differences.

Settlement and cross-venue positions

A two-leg position across venues only works if both legs resolve the same way. The whole return is a couple of cents; a divergent resolution is a loss of the entire position.

That asymmetry is why comparability has to be graded rather than assumed, and why a high headline gap on a poorly matched pair is worse than useless. Equivalence grades and what a gap is worth.

The decision

Before entering, decide whether you intend to exit or settle, because it changes the arithmetic. Exiting pays the spread twice and frees capital earlier. Settling pays once and commits capital fully. Early exit versus holding compares them properly.

Early exit versus holding.

Educational content only. Nothing here is financial advice, a solicitation, or an offer to trade. Prediction markets can move against you and a position can lose its entire value. Where this guide describes a difference between venues it describes a theoretical cross-market edge in observed prices, which is not a profit: fees, spreads, capital lockup, transfer time and differing settlement rules all come out of it first.