Platform Fees

How fees are applied

Fees are taken in USDC (or USDC.e where applicable) from the same custodial balance you use to trade. They are not billed separately on a card invoice unless you purchase a subscription through a third-party checkout—this page covers per-trade and per-claim platform fees only.

When you see the fee

For terminal and Playground orders, the platform fee is applied when the order is placed or executed according to the rules below (for example, terminal fees on BUY orders). For Auto Trader, fees apply per limit order the service submits, as described in the Auto Trader Terms. For claims, the fee is withheld from the claimed proceeds before they credit to your balance.

Terminal Trading

Manual trading in the Terminal incurs a 2.5% platform fee on BUY orders. SELL orders are not subject to this platform fee. The fee is deducted from your USDC balance together with the trade—plan for both the share purchase and the fee when sizing orders.

Why BUY-only for the terminal

Charging on the buy side keeps pricing visible at execution time: you are entering risk and liquidity when you acquire YES or NO shares. Selling typically reduces exposure; check the latest in-app copy and Terms if the fee model changes for a specific market type.

Auto Trader

Auto Trader charges a 1–2% fee on every limit order placed by the service. The fee is charged whether the order is filled, partially filled, or unfilled, and is deducted from your USDC.e balance. Exact tiers and any caps are spelled out in the Auto Trader Terms (including the fees section).

Operational takeaway

Because fees apply per order submission, rapid repricing or many small orders can accumulate fees quickly even when fill rates are low. Use the risk controls documented in the Auto Trader guide and pause automation if balances are tight.

Playground Trading

Trading via Playground strategies incurs a 1% platform fee on orders placed by your strategy. Fees are automatically deducted from your custodial wallet balance. If a strategy cannot cover fees and minimum order size, orders may fail until you deposit more USDC or reduce size.

Claiming Winning Positions

When you claim proceeds from a winning position, Polyblock charges a 1% fee on the amount claimed. The fee is deducted from the claimed amount before it is credited to your balance. Losing positions do not generate claim proceeds; there is no claim fee on losses.

Worked examples (illustrative)

Terminal BUY

If you buy $100 notional of YES shares in the terminal, a 2.5% platform fee is $2.50. You need at least $102.50 of available USDC (plus any rounding the UI applies) to complete that entry. The fee does not change the resolution payout: winning shares still redeem at $1.00 each per share, subject to claim fees when you claim.

Claim

If you claim $500 of proceeds from resolved winners, a 1% fee is $5.00, and $495.00 credits to your balance. Use these figures only as a pattern—the app shows live numbers at execution time.

Balances, rounding, and failed orders

Insufficient balance is the most common reason orders fail after fees. Before scaling size, check open orders, Playground or Auto Trader reserved balances, and recent fills in Trade History. If an order fails, reduce size or add USDC and retry.

Polymarket itself may have separate costs or constraints (for example, network settlement nuances) that are outside Polyblock’s platform fee. Always read market disclosures in the terminal for the specific contract you trade.