In order to enhance the reliability and stability of the perpetual swap market, we have donated US$4,567,888-worth BTC to the BTC perpetual swap insurance fund at 22:00 Jul 24, 2019 (CEST, UTC+2) (Conversion rate taken from the BTC/USD index price of OKX at 14:00 July 24, 2019 (CEST, UTC+2)). Thank you for your continued support and we assure you of our best service at all times. Regards, OKX Jul 25, 2019

Dear valued customers, We have injected the remaining balance of the insurance fund for the original Bitcoin Cash futures contract into the insurance funds of Bitcoin Cash ABC (BCH) and Bitcoin Cash SV (BSV) futures contracts at Jan 4, 2019 (CET, UTC+1): BCH insurance fund: 444.1200BCH，7:47am Jan 4, 2019 (CET, UTC+1) BSV insurance fund: 444.1200BSV，7:55am Jan 4, 2019 (CET, UTC+1) Thank you for your continued support and we assure you our best services at all times. Regards, OKX Jan 4, 2018

not to exercise the option.

Thank you for your continued support and we assure you of our best services at all times. OKX April 4, 2023 (UTC)

Thank you for your continued support and we assure you of our best services at all times. OKX May 20, 2022 (UTC) Click Here to Download OKX App >>> Click Here for OKX Twitter >>> Click Here to Join OKX Official Community >>>

When you buy a Simple Option, you're purchasing an option contract. An option is a right that can be exercised on its expiry date: If exercising the option is favorable at expiry, you'll receive the corresponding profit, while the seller covers the expense. If exercising the option is unfavorable, you can simply choose not to exercise it. Your maximum risk is limited to the premium you paid to purchase the option contract.

Strike price (or exercise price): the price at which the Options buyer can buy or sell an underlying asset when exercising a Call or Put options respectively. Contract type: Call options give the buyer the right to buy at a specified price while Put options give the right to sell at a specified price. Exercise Style: American Options can be exercised at any time prior to its expiration date. European options can only be exercised on its expiration date. OKX Options are European options.

What are the API Best Practices? For those connected via API, visit here to learn more about API best practices.Is Market Maker Protection (MMP) available for options trading? We offer Market Maker Protection for options market makers to protect makers from executing too much within a short period of time. Please contact your account manager or institutional@okx.com if you want to have it enabled. Please refer to Market Maker Protection API.

Contract type: Call options give the holder the right to buy at a specified price while put options give the right to sell at a specified price. Exercise Style: American Options can be exercised at any time prior to its expiration date. European options can only be exercised on its expiration date. OKX Options are European options. Option premium: the price at which an option is bought or sold.

For Institutional Investors: 6.1 API Best Practices For those connected via API, here is API best practices. 6.2 Market Maker Protection (MMP) We offer MMP for options market makers to protect makers from executing too much within a short period of time. Please contact your account manager or institutional@okx.com if you want to have it enabled. Please refer to MMP API. Please note the time interval is in milliseconds, not seconds.

For example, 4th-daily options will not be generated every Monday as the weekly options also expire on that same Friday.

As to initial margin of short positions, please refer to Introduction to the calculation of options margin. Maintenance margin The maintenance margin for long positions is 0. As to maintenance margin of short positions, please refer to Introduction to the calculation of options margin. 2. Multi-currency margin mode: cross margin Under the multi-currency margin mode: cross margin, the system only allows users to open short positions of options.

Call options’ seller: Position margin = [max (0.1, 0.15 - OTM value / same expiry futures mark price) * margin factor + options mark price] * contract multiplier * amount of positions = [max (0.1, 0.15 – 100 / 5900) * 1.02 + 0.0575] * 0.1 * 50 = 0.96606 BTC (3) Put options’ seller:Position margin of BTCUSD and ETHUSD options = [max (0.1 * (1 + options mark price), 0.15 – OTM value / same expiry futures mark price) * margin factor + options mark price] * contract multiplier * amount of positions Example

Order and Position Limits Options Order and Position Limits Rule Type Coin-Margined BTC/USD Options Coin-Margined ETH/USD Options USDⓈ-margined BTC/USD Options USDⓈ-margined ETH/USD Options #1 Max. No. of contracts for each order 25,000 50,000 25,000 500,000 #2 Max. No. of current open orders for one instrument 12 12 12 12 #3 Max. No. of contracts of all open orders for one underlying 500,000 500,000 500,000 5,000,000 #4 Max. No. of open orders for one underlying 500 500 500 500 #5 Max.

As advised by the MANTRA team in the following X post, OKX will revise the OM ERC20 to MANTRA chain migration schedule. OM transfers, deposits and withdrawals will be suspended at 08:00 UTC on Jan 3, 2026. The migration will take place between 08:00 UTC on Jan 3, 2026, and 22:00 UTC on Jan 5, 2026. Please note that OKX will strive to complete the token migration within the specified time frame....