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There are four ways a position closes on Ostium: manual full close, manual partial close, automated close via TP/SL, or liquidation.

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Manual Close

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Full Close

Click Close on any open position to exit entirely at the current bid (longs) or ask (shorts). Your collateral plus or minus PnL is returned to your wallet. The $0.10 oracle fee charged at open is refunded on a successful full close.

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Partial Close

Close a portion of your position while keeping the rest open. Set the dollar amount or percentage in the close dialog. Each partial close incurs a $0.10 oracle fee. The remaining position must still meet the pair’s minimum trade size.

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Automated Close: TP and SL

Take-profit and stop-loss orders close your position automatically when the market reaches your specified level. Both are set and managed from the Positions panel (see Managing Positions).
  • Take-Profit (TP): Triggers when price moves in your favor. Executes as a limit close at your target price.
  • Stop-Loss (SL): Triggers when mid-price crosses your level. Executes as a market close at the bid/ask.
Automated TP and SL executions do not charge an oracle fee. No cancellation fees apply.

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Liquidation

Liquidation is an automatic close triggered when your collateral falls below the liquidation threshold. There is no margin call. Keeper bots (Gelato Functions) execute liquidations onchain; the protocol pays the gas fee. After liquidation, remaining collateral is retained by the protocol as part of settlement. You do not receive any remaining collateral. See Vault Overview for how settlement flows reconcile onchain and offchain. See Liquidation for thresholds, formulas, and how to avoid it.

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Collateral After Close

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FAQ

Profitable closes within the first 15 seconds of opening incur an early-close fee that decays linearly from 40 bps to 0. The fee is capped at the position’s realized profit, so it cannot make a trade net-negative. Closes after 15 seconds, and losing or breakeven closes within 15 seconds, pay nothing to close. The oracle fee from opening is refunded on a successful full close. See Early-Close Fee for the full mechanics and a worked example.
Yes — see Partial Close above. A $0.10 oracle fee applies per partial close, and the remaining position must meet the pair’s minimum trade size.
No. Remaining collateral is retained by the protocol as part of settlement. Liquidation thresholds, formulas, and mechanics for avoiding liquidation (stop-losses, lower leverage, added collateral) are documented on the Liquidation page.
Building this programmatically? The Builder SDK exposes closeTrade() for full and partial closes. See Close a Trade.
  • Liquidation — Thresholds, formulas, and worked examples.
  • Fees — All costs on Ostium in one page.
  • Managing Positions — Adjust TP/SL and collateral while open.