How are crypto options trading fees charged, and do they earn a fee rebate?

Which exchange this page is about

Options are a separate product from perpetual futures and spot, and not every exchange offers them. Among the exchanges covered on loweef, OKX is the one with a listed options product, so the rules below come from OKX's own options guide. The structure — a rate per contract with a cap tied to the premium, plus a fee at exercise — is common on crypto options venues, but the exact numbers belong to each exchange's fee schedule.

How the trading fee is calculated

OKX's guide gives the formula for coin-margined options with a positive fee rate:

Fee = Min(fee rate, cap × option premium) × multiplier × contract size × number of contracts

• The fee rate is your tier's options rate.
• The cap is a fixed share of the option premium set out in OKX's guide. Whichever is lower — your rate or that share of the premium — is what you pay per unit.
• For USDⓈ-margined options the same result is also multiplied by the index price, so the fee is expressed in the settlement currency.
• When the fee rate is negative (a maker rebate built into the tier), the same logic runs the other way: the rebate is the larger of the negative rate and the negative of that share of the premium, so it can't exceed a set fraction of the premium either. See negative maker fees for how negative rates work in general.

Why the premium cap matters

A per-contract rate is the same whether the option costs a lot or very little. On a far out-of-the-money option with a tiny premium, a flat rate could be a large share of what you pay — or more than the option itself. The cap keeps the fee in proportion to the premium. For expensive options the cap rarely binds and you simply pay your rate; for cheap ones the cap is often what decides the fee. That is why the same number of contracts can cost very different fees depending on how far the strike is from the market.

Two fees: trading and exercise

OKX states that both transaction fees and exercise fees are applied. The trading fee is charged when you open or close a position by trading; the exercise fee is charged when an option is exercised at expiry. The options guide doesn't print the exercise rate — it points to OKX's fee schedule — so check the schedule rather than assuming exercise is free. If you close a position before expiry by trading, you pay the trading fee on that trade instead of being exercised.

Where to see your own rates

OKX shows the rates that apply to you under My trading fees in your master account, and the full schedule by tier on its trading fees page. Rates differ by tier and can differ between makers and takers, so the number on that page is the one to use when you estimate costs — see maker vs taker fees for the general difference, and where to see the fees you paid to check what was actually charged after a trade.

Do options trades earn a fee rebate?

A fee rebate is a percentage of the trading fees you actually pay (up to 60% on partner exchanges), and it is calculated from the commission the exchange reports for your account. Which products an exchange counts toward its affiliate commission is set by its own program — futures and spot are the usual base, and options are a separate question for each exchange. So don't assume options volume is included or excluded: after trading options, compare your rebate history with the fees shown in your trade history. The premium itself is the price of the option, not a fee, so no rebate returns it. More on how rebates are worked out: what a fee rebate is.