OKX vs Deribit: Comparing the Cost of Buying BTC Put Options for Protection

OKX

07 October 2026

When comparing put option protection costs between OKX and Deribit, you can't just look at the headline fee rate. OKX's fee formula hides a detail that works against buyers: when you buy a cheap option, the actual fee may be capped by "7% of the premium" instead of being charged at 0.03% of notional value. This means that buying the same deep out-of-the-money put option could cost you significantly more in friction on OKX than on Deribit.

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First, understand what makes up "protection cost"

When you buy a BTC put option to protect your spot position, your total cost includes: the premium itself (the market price of the option) + trading fees (charged when you open the position) + delivery fees (if you hold to expiry and the option is in the money). The premium is market-driven and should theoretically be similar across platforms, but Deribit typically has better depth and tighter bid-ask spreads. Fees and delivery charges are platform rules, and these differences are more clear-cut.

OKX's fee formula is not buyer-friendly

According to OKX's official help center, the coin-margined options trading fee formula is: Positive fee rate: Min(fee rate, 7% × option premium) × multiplier × contract face value × number of contracts. The key part of this formula is the Min function. It means the fee you actually pay is the smaller of "the fee rate" and "7% of the premium".

For users on the standard fee tier, the options taker fee is about 0.03% (three ten-thousandths of notional value). If you buy a deep out-of-the-money put option with a very cheap premium, 7% of the premium is almost certainly less than 0.03% of notional value. Here's an example:

Assume BTC is at $100,000, and you buy a put option with a strike price of $80,000. The premium is 200 USDT. 0.03% of notional value = 30 USDT. 7% of premium = 14 USDT. Min(30, 14) = 14, so you actually pay 14 USDT in fees, which is higher than the nominal rate would suggest.

If you buy an at-the-money option with a more expensive premium, say 2,000 USDT, then 7% = 140 USDT, while the nominal rate fee is 30 USDT. Min(30, 140) = 30, so you're charged at the standard rate in this case.

The conclusion is: OKX buyers purchasing "cheap" put options are protected by a premium percentage floor, but this protection works against the buyer — it makes the actual fee rate higher than the nominal rate.

OKX's fee cap is 7% of premium, while Deribit's fee cap is 12.5% of premium. Deribit's nominal fee rate is also 0.03% for maker/taker.

Deribit's fees are more linear

Deribit's options trading fees are a flat 0.03% of notional value (or the BTC equivalent), the same for maker and taker, with a cap of 12.5% of option value. For buyers, the 12.5% cap is more lenient than OKX's 7% — meaning that when buying cheap options, Deribit's fees are less likely to be pushed up by the cap.

On delivery fees, Deribit charges 0.015% of notional value for in-the-money options, capped at 12.5% of option value. OKX's delivery fees are tiered based on account level, with no publicly unified percentage cap.

Liquidity differences are a more hidden cost

Deribit accounts for roughly 85% of BTC and ETH options trading volume in crypto. This means:

Tighter bid-ask spreads: the gap between the ask price you pay for a put option and the market maker's bid price is smaller. This spread is an "invisible" cost that may be larger on OKX.
Easier to find a counterparty to close: if you don't want to hold to expiry, Deribit's depth lets you close at a price closer to theoretical value. OKX's options liquidity is far behind Deribit, and slippage when closing could eat into part of your protection value.

A data point from Delphi Digital: BTC 30-day ATM implied volatility typically differs by less than 1 volatility point across major platforms, showing that pricing efficiency is similar. But when platforms diverge, the gap "tends to appear on the front end and on less liquid underlying assets". OKX's BTC options are better than smaller platforms, but still not in the same league as Deribit in terms of depth.

What to look at when making an actual comparison

If you're just buying a put option to protect your spot position, compare protection costs in this order:

First, look at the premium ask price. Directly compare the ask quotes for options with the same expiry and strike price on OKX and Deribit. If Deribit's ask is noticeably lower, your total cost is lower even if the fee formulas are similar.

Second, calculate OKX's actual fee. Don't just look at the 0.03% figure. Use Min(0.03% × notional value, 7% × premium) to work it out. If you're buying a deep out-of-the-money put with a cheap premium, OKX's actual fee may be far higher than 0.03%.

Third, consider whether you'll hold to expiry. If you plan to exercise at expiry, include delivery fees. Deribit's 0.015% is clear. OKX's delivery fees are tiered, so you need to check the rate for your account level.

Fourth, if you're a frequent trader, Deribit's depth advantage becomes magnified — each trade has less spread loss, and the cumulative difference over time is substantial.