🧾 Polymarket trading costs, explained — and what Polyfox charges

Polyfox's pricing fits in one sentence: a flat 1% per trade, and nothing else from us. That covers buys, sells and copied trades alike. But "what does trading cost?" has a second half that no fee table shows — the implicit costs of spread and slippage — and knowing both halves is what lets you compare venues and bots honestly.

What Polyfox charges

So a $10 buy costs $10 plus a $0.10 fee, and selling the position later costs 1% of the sale the same way. Copied trades are priced identically to manual ones — copying adds no extra fee layer.

There are no tiers to unlock and nothing to subscribe to: the features described in these docs — copy trading, limit orders, Smart Wallets — are all included.

What Polymarket itself charges

Polyfox is an independent tool and is not affiliated with Polymarket. Polymarket sets its own fee policy for trading on its markets, and that policy has changed over time and can differ between markets — Polymarket's official documentation is the source of truth for what currently applies where. When you trade through Polyfox, the price and total you see on the confirmation screen are what you commit to.

The cost no fee table shows: spread and slippage

Every order book trade carries an implicit cost that goes to the market, not to any platform:

• Spread — the gap between the best buying price and the best selling price. Buy at the 47¢ ask when the bid is 45¢, and you are instantly 2¢ per share away from what you could sell for. Tight in busy markets, wide in quiet ones.
• Slippage — a larger market order can consume the shares available at the best price and fill the rest at worse prices, so the average fill lands above the quoted price. Polyfox market orders carry a slippage guard (default 2% on buys, 10% on sells) and are fill-or-kill: if the guard can't be met, nothing executes.

In an illiquid market, these implicit costs can exceed any explicit fee — which is why the order book is worth a glance before sizing an order, and why limit orders exist: they let you set your price instead of paying the spread.

Comparing costs anywhere

Wherever you trade, the honest total cost of a round trip is: explicit fees (both directions) + spread + slippage + any deposit/withdrawal charges. A venue advertising "zero fees" with wide spreads can cost more per trade than a 1% fee on a tight book. Polyfox keeps its half simple — 1% per trade, everything else free of Polyfox fees — so the part worth checking per market is the book itself.

This page is informational only and is not investment advice; positions can lose all of their value — see Legal notes.

Next steps

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