1, contract trading, actually also called as futures trading, refers to the trading parties, in the exchange through the purchase and sale of contracts, and according to the agreement in a specific time and place in the future, the purchase and sale of a specified number of commodities at a specific price. (1) Users decide the direction of long and short based on their judgement of the BTC price trend, and choose the contract type based on the length of time. OKEX currently offers three contract types, namely: current week, next week and quarterly. The current week contract refers to the contract for delivery on the Friday closest to the trading day; the next week contract refers to the contract for delivery on the second Friday closest to the trading day. A quarterly contract is a contract with a delivery date on the last Friday of the nearest current month in March, June, September or December and does not overlap with the delivery date of the current week/next week/monthly contract. (2) The user selects the appropriate price and quantity for the transaction. The margin required by the user to purchase a contract is the amount of BTC equal to the value of the contract at the time of closing divided by the leverage multiple. Only if the account equity is greater than or equal to the amount of margin after a successful transaction, the user can proceed with the commission operation. (3) Margin When setting up a contract trading account, the user needs to select a margin mode, different margin modes have different methods of calculation and risk control. The margin mode can be changed when there are no positions and no pending orders, i.e. when the margin for all contracts is 0. When using the full position margin mode, the risk and return of all positions held in the account will be combined. The requirement for opening a position in the full position margin mode is that the margin rate cannot fall below 100% after the position is opened. With position-by-position margin mode, each position will have its margin and return calculated independently for each contract in both directions. The user can only place an order if the margin available for opening a position is greater than the amount of margin required to open the position. With position-by-position margin, the available margin for each contract may not be the same. (4) Once a trade is closed, the user holds a position in the corresponding long or short direction. Under full margin, the user's account equity will increase or decrease according to the latest transaction price; under full margin mode, when the user's account equity is less than 10% of the margin for a contract under 10 leverage, or less than 20% of the margin for a BTC contract under 20 times leverage, the system will close the position forcibly. Under position-by-position margin, the unrealised profit or loss of a user's position in a certain direction of a contract will increase or decrease according to the latest transaction price, while the margin will not change. When the margin rate of a user's position in a certain direction of a contract is less than or equal to 10% (10 times leverage) or 20% (20 times leverage), the system will close the position forcibly. (5) Holding positions Once a position is closed, the user holds the position in the corresponding long/short direction. (6) Position adjustment The user can also adjust the position at any time according to the market situation, by closing the position to lock in the gain or stop loss, or continue to open the position to increase the gain. (7) Settlement On the settlement date, open positions are closed out by delivery at a price of one dollar per point, based on the delivery index. All proceeds from closed positions will be aggregated to the "Realised P&L" section of the user's contract account. After settlement, the system will deduct the loss of the user of the open position from the net profit account of all the contracts on a pro-rata basis. (8) Liquidation After liquidation, all realised gains and losses will be aggregated to the account balance. (9) Closing The contract ends and the exchange issues a new contract. 2. In addition to relying on scientific methods, cryptocurrency arbitrage is also about finding ways to save money. One of the easiest ways to do this is to take advantage of the reduced transaction fees. The handling fee is small, but it must not be ignored. I once calculated that as long as the transactions are frequent and long, the accumulation of small amounts may lead to more than 10,000 U. Next, I will introduce a few common ways to reduce the fees for large trading platforms. (1) Lowering Binance's fees Binance is currently the world's largest digital currency exchange, and you must sign up for Binance if you want to speculate on coins. The transaction fee is deducted from the assets received. For example, if you buy Ethereum/USDT, the fee is paid in Ethereum. If you sell Ethereum/USDT, the commission is paid in USDT. Example. You place an order for 10Ethereum at a price of USD3,452.55 per share. Transaction fee = 10Ethereum0.1% = 0.01Ethereum Or you place an order to sell 10Ethereum at 3,452.55 USDT per share. Transaction fee = (10Ethereum3,452.55USDT)*0.1% = 34.5255USDT What many people do not know is that the Binance transaction fee can also be reduced. If you want to reduce your Binance trading fees, you must use the invitation link below or use the invitation code "Q022W7SC" to register. https://accounts.binance.com/en/register?ref=Q022W7SC

(2) Reducing OKX fees OKX is a professional digital currency trading platform loved by many users, and its transaction fees can be reduced. Depending on the volume of transactions, OKX divides its users into two levels: normal and professional. Ordinary users are graded according to their OKB positions, while professional users are graded according to their trading volume and asset size. The different tiers determine the trading fees for the next trading day. When calculating the fee levels, if the coin trading volume, total trading volume of delivery and perpetual contracts (USDT delivery contract, coin-based delivery contract, USDT perpetual contract, coin-based perpetual contract), option contract trading volume, and asset volume meet the conditions of different fee levels, users will enjoy the fee discount of the highest level. First method: OKX has an official maximum savings rate of 20%. Use the link below to register with OKX and save 20% on fees. https://www.ouyi.business/join/BTC1ETH Second method: Open the OKX website and enter "BTC1ETH" in the "Invitation Code" on the registration page to see the cashback percentage: 20% at the bottom. Be sure to enter this invitation code, otherwise you can not get 20% cashback percentage. (3) Reduce FTX fees FTX is currently a very fast-growing, contract players more exchange, you must register FTX if you play the contract. if you want to reduce the FTX transaction fees, you must use the following invitation link to register. https://ftx.com/referrals#a=121031692 3, trading road is long, together with the forward Want to know more about how to reduce the commission? telegram: btcethcool We have set up a community dedicated to the study of trading, add telegram friends to pull you into the community.