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 >>>

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.

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.

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

Details of Order or Position Limits The following are position limit rules for options trading. Number in examples shown below are for reference only. Please refer to the above table for the maximum limits. [Rule #1] Max. No. of BTC/USD Options contracts for each order is 25,000. One can place an order of up to 25,000 BTC/USD options contracts. Example: User wants to buy or sell 25,001 BTC/USD options contracts. As the number of order contracts exceeds the limit, this order cannot be placed.

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....

If you create a weekly plan at 11:05 AM on Tuesday, your future orders will be completed every Tuesday at 11:05 AM. You can check the date of your next order with your plan details.3. How do I manage my recurring buy plan? You can manage your plan easily from your plan details. Go to the Activity page and you'll find Recurring buy option on top of the page. Select Recurring buy to view all the plans you've set up.