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40 lines
1.2 KiB
Python
40 lines
1.2 KiB
Python
from math import ceil
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from freqtrade.exceptions import OperationalException
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from freqtrade.util import FtPrecise
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one = FtPrecise(1.0)
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four = FtPrecise(4.0)
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twenty_four = FtPrecise(24.0)
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def interest(
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exchange_name: str,
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borrowed: FtPrecise,
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rate: FtPrecise,
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hours: FtPrecise
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) -> FtPrecise:
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"""
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Equation to calculate interest on margin trades
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:param exchange_name: The exchanged being trading on
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:param borrowed: The amount of currency being borrowed
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:param rate: The rate of interest (i.e daily interest rate)
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:param hours: The time in hours that the currency has been borrowed for
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Raises:
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OperationalException: Raised if freqtrade does
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not support margin trading for this exchange
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Returns: The amount of interest owed (currency matches borrowed)
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"""
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exchange_name = exchange_name.lower()
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if exchange_name == "binance":
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return borrowed * rate * FtPrecise(ceil(hours)) / twenty_four
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elif exchange_name == "kraken":
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# Rounded based on https://kraken-fees-calculator.github.io/
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return borrowed * rate * (one + FtPrecise(ceil(hours / four)))
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else:
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raise OperationalException(f"Leverage not available on {exchange_name} with freqtrade")
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