Polymarket fees, spread and slippage: calculate the full order cost
https://sharkrule.com/learn/polymarket-fees-slippage/

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1. Outcome token / snapshot time
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2. Side and reference price type
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3. Quantity / price / notional for each level
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4. Total notional and weighted average
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5. Separate fees, provider and evidence
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6. Per-share limit / total budget / cost reserve
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7. Modeled versus actual result
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8. Missing information and uncertainty
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Prepared with AI assistance using the official sources linked above. The numerical examples and decision boundaries were checked with local, deterministic test fixtures. No live trades, performance backtest or independent expert review was conducted. Documentation was checked on 12 September 2026; check the linked provider guidance for later changes.