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The buyer is obligated to buy the underlying asset a specific price once the contract expires,
and the seller is required to furnish the asset at the time of expiry.

1. Expiry date: There is no delivery date and expiry date in perpetual swap trading.
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2. Funding: As there is no expiry date, a "funding" mechanism is used to anchor the perpetual swap price to spot market price. Funding occurs every 8 hours.
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Funding = position value * funding rate (The funding rate is determined by the difference between contract price and spot index price).

* When the funding rate is positive, longs pay shorts.
* When it is negative shorts pay longs.
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Perpetual Swap contracts don’t expire & charge funding rate at 3 predetermined times every day.

The funding payment, which is the size of your position plus the funding rate, is elicited every 8 hours at the below times:
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Binance Futures
Funding occurs every 8 hours at:
7:00 PM (UTC-5) 00:00 UTC - Bitcoin Daily candle close
3:00 AM (UTC-5) 08:00 UTC - Bitcoin 4 hour candle close
11:00 AM (UTC-5) 16:00 UTC - Bitcoin 4 hour candle close
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Okex Futures
Funding occurs every 8 hours at:
6:00 PM (UTC-5) 01:00 CET
2:00 AM (UTC-5) 09:00 CET
10:00 AM (UTC-5) 17:00 CET
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The funding is designed to keep the flow of perpetual contracts that do not expire. Since there’s no expiry with perpetual swaps, it is challenging for the price to converge on the index price.
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The result is that traders are incentivized to open or close certain positions, which focalize the contract price on the index price using interest payments transferred between the long and short traders.
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