Merge is an exit without a book trade

Not every exit has to be a sale. If you hold equal Yes and No positions, the position system can give you a separate route back to collateral: merge the complete set.

Polymarket's positions documentation separates split, trade, merge, and redeem. Keeping those operations distinct makes the position journal easier to reason about.

Know how the set was made

Splitting converts pUSD into equal Yes and No positions. Trading acquires or reduces one outcome through the order book. A complete set is the prerequisite for merging back into pUSD.

Record the two balances by outcome. A single Yes position is not a complete set, even if its displayed value looks close to the collateral amount.

Separate merge from sale

Selling gives up an outcome position at a market price and depends on available book liquidity. Merging uses equal amounts of both outcomes and is a position-management operation instead of an order-book fill.

The two routes answer different questions. A sale asks what price the market will pay now; a merge asks whether the balances already form a complete set.

Keep resolution separate

Redeeming happens after resolution and follows the recorded payout. Merging is available for a complete set before that step, so do not label a merged balance as a winning redemption.

The useful question is not only how much collateral the screen seems to show. It is which operation matches the balances you actually hold and the market state you are in.

Further reading: Positions and tokens.

Explore the markets: Open Polymarket (referral link).