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Merge pull request #2830 from orehunt/spreadfilter

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- added spread filter
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hroff-1902 2020-02-04 23:37:09 +03:00 committed by GitHub
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7 changed files with 131 additions and 5 deletions
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4
config_full.json.example
View File

@ -62,8 +62,8 @@
"refresh_period": 1800
},
{"method": "PrecisionFilter"},
{"method": "PriceFilter", "low_price_ratio": 0.01
}
{"method": "PriceFilter", "low_price_ratio": 0.01},
{"method": "SpreadFilter", "max_spread_ratio": 0.005}
],
"exchange": {
"name": "bittrex",

6
docs/configuration.md
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@ -503,6 +503,7 @@ Inactive markets and blacklisted pairs are always removed from the resulting `pa
* [`VolumePairList`](#volume-pair-list)
* [`PrecisionFilter`](#precision-filter)
* [`PriceFilter`](#price-pair-filter)
* [`SpreadFilter`](#spread-filter)
!!! Tip "Testing pairlists"
Pairlist configurations can be quite tricky to get right. Best use the [`test-pairlist`](utils.md#test-pairlist) subcommand to test your configuration quickly.
@ -551,6 +552,11 @@ Min price precision is 8 decimals. If price is 0.00000011 - one step would be 0.
These pairs are dangerous since it may be impossible to place the desired stoploss - and often result in high losses.
#### Spread Filter
Removes pairs that have a difference between asks and bids above the specified ratio (default `0.005`).
Example:
If `DOGE/BTC` maximum bid is 0.00000026 and minimum ask is 0.00000027 the ratio is calculated as: `1 - bid/ask ~= 0.037` which is `> 0.005`
### Full Pairlist example
The below example blacklists `BNB/BTC`, uses `VolumePairList` with `20` assets, sorting by `quoteVolume` and applies both [`PrecisionFilter`](#precision-filter) and [`PriceFilter`](#price-pair-filter), filtering all assets where 1 priceunit is > 1%.

3
freqtrade/constants.py
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@ -17,7 +17,8 @@ REQUIRED_ORDERTIF = ['buy', 'sell']
REQUIRED_ORDERTYPES = ['buy', 'sell', 'stoploss', 'stoploss_on_exchange']
ORDERTYPE_POSSIBILITIES = ['limit', 'market']
ORDERTIF_POSSIBILITIES = ['gtc', 'fok', 'ioc']
AVAILABLE_PAIRLISTS = ['StaticPairList', 'VolumePairList', 'PrecisionFilter', 'PriceFilter']
AVAILABLE_PAIRLISTS = ['StaticPairList', 'VolumePairList',
'PrecisionFilter', 'PriceFilter', 'SpreadFilter']
DRY_RUN_WALLET = 1000
MATH_CLOSE_PREC = 1e-14 # Precision used for float comparisons

59
freqtrade/pairlist/SpreadFilter.py Normal file
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@ -0,0 +1,59 @@
import logging
from copy import deepcopy
from typing import Dict, List
from freqtrade.pairlist.IPairList import IPairList
logger = logging.getLogger(__name__)
class SpreadFilter(IPairList):
def __init__(self, exchange, pairlistmanager, config, pairlistconfig: dict,
pairlist_pos: int) -> None:
super().__init__(exchange, pairlistmanager, config, pairlistconfig, pairlist_pos)
self._max_spread_ratio = pairlistconfig.get('max_spread_ratio', 0.005)
@property
def needstickers(self) -> bool:
"""
Boolean property defining if tickers are necessary.
If no Pairlist requries tickers, an empty List is passed
as tickers argument to filter_pairlist
"""
return True
def short_desc(self) -> str:
"""
Short whitelist method description - used for startup-messages
"""
return (f"{self.name} - Filtering pairs with ask/bid diff above "
f"{self._max_spread_ratio * 100}%.")
def filter_pairlist(self, pairlist: List[str], tickers: Dict) -> List[str]:
"""
Filters and sorts pairlist and returns the whitelist again.
Called on each bot iteration - please use internal caching if necessary
:param pairlist: pairlist to filter or sort
:param tickers: Tickers (from exchange.get_tickers()). May be cached.
:return: new whitelist
"""
# Copy list since we're modifying this list
spread = None
for p in deepcopy(pairlist):
ticker = tickers.get(p)
assert ticker is not None
if 'bid' in ticker and 'ask' in ticker:
spread = 1 - ticker['bid'] / ticker['ask']
if not ticker or spread > self._max_spread_ratio:
logger.info(f"Removed {ticker['symbol']} from whitelist, "
f"because spread {spread * 100:.3f}% >"
f"{self._max_spread_ratio * 100}%")
pairlist.remove(p)
else:
pairlist.remove(p)
return pairlist

7
freqtrade/pairlist/VolumePairList.py
View File

@ -28,6 +28,7 @@ class VolumePairList(IPairList):
'for "pairlist.config.number_assets"')
self._number_pairs = self._pairlistconfig['number_assets']
self._sort_key = self._pairlistconfig.get('sort_key', 'quoteVolume')
self._min_value = self._pairlistconfig.get('min_value', 0)
self.refresh_period = self._pairlistconfig.get('refresh_period', 1800)
if not self._exchange.exchange_has('fetchTickers'):
@ -73,12 +74,13 @@ class VolumePairList(IPairList):
tickers,
self._config['stake_currency'],
self._sort_key,
self._min_value
)
else:
return pairlist
def _gen_pair_whitelist(self, pairlist: List[str], tickers: Dict,
base_currency: str, key: str) -> List[str]:
base_currency: str, key: str, min_val: int) -> List[str]:
"""
Updates the whitelist with with a dynamically generated list
:param base_currency: base currency as str
@ -97,6 +99,9 @@ class VolumePairList(IPairList):
# If other pairlist is in front, use the incomming pairlist.
filtered_tickers = [v for k, v in tickers.items() if k in pairlist]
if min_val > 0:
filtered_tickers = list(filter(lambda t: t[key] > min_val, filtered_tickers))
sorted_tickers = sorted(filtered_tickers, reverse=True, key=lambda t: t[key])
# Validate whitelist to only have active market pairs

47
tests/conftest.py
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@ -640,6 +640,31 @@ def shitcoinmarkets(markets):
},
'info': {},
},
'NANO/USDT': {
"percentage": True,
"tierBased": False,
"taker": 0.001,
"maker": 0.001,
"precision": {
"base": 8,
"quote": 8,
"amount": 2,
"price": 4
},
"limits": {
},
"id": "NANOUSDT",
"symbol": "NANO/USDT",
"base": "NANO",
"quote": "USDT",
"baseId": "NANO",
"quoteId": "USDT",
"info": {},
"type": "spot",
"spot": True,
"future": False,
"active": True
},
})
return shitmarkets
@ -1114,6 +1139,28 @@ def tickers():
'quoteVolume': 1154.19266394,
'info': {}
},
"NANO/USDT": {
"symbol": "NANO/USDT",
"timestamp": 1580469388244,
"datetime": "2020-01-31T11:16:28.244Z",
"high": 0.7519,
"low": 0.7154,
"bid": 0.7305,
"bidVolume": 300.3,
"ask": 0.7342,
"askVolume": 15.14,
"vwap": 0.73645591,
"open": 0.7154,
"close": 0.7342,
"last": 0.7342,
"previousClose": 0.7189,
"change": 0.0188,
"percentage": 2.628,
"average": None,
"baseVolume": 439472.44,
"quoteVolume": 323652.075405,
"info": {}
},
})

10
tests/pairlist/test_pairlist.py
View File

@ -141,7 +141,7 @@ def test_VolumePairList_refresh_empty(mocker, markets_empty, whitelist_conf):
([{"method": "VolumePairList", "number_assets": 5, "sort_key": "bidVolume"}],
"BTC", ['HOT/BTC', 'FUEL/BTC', 'XRP/BTC', 'LTC/BTC', 'TKN/BTC']),
([{"method": "VolumePairList", "number_assets": 5, "sort_key": "quoteVolume"}],
"USDT", ['ETH/USDT']),
"USDT", ['ETH/USDT', 'NANO/USDT']),
# No pair for ETH ...
([{"method": "VolumePairList", "number_assets": 5, "sort_key": "quoteVolume"}],
"ETH", []),
@ -160,6 +160,10 @@ def test_VolumePairList_refresh_empty(mocker, markets_empty, whitelist_conf):
{"method": "PrecisionFilter"},
{"method": "PriceFilter", "low_price_ratio": 0.02}
], "BTC", ['ETH/BTC', 'TKN/BTC', 'LTC/BTC', 'XRP/BTC']),
# HOT and XRP are removed because below 1250 quoteVolume
([{"method": "VolumePairList", "number_assets": 5,
"sort_key": "quoteVolume", "min_value": 1250}],
"BTC", ['ETH/BTC', 'TKN/BTC', 'LTC/BTC']),
# StaticPairlist Only
([{"method": "StaticPairList"},
], "BTC", ['ETH/BTC', 'TKN/BTC']),
@ -167,6 +171,10 @@ def test_VolumePairList_refresh_empty(mocker, markets_empty, whitelist_conf):
([{"method": "StaticPairList"},
{"method": "VolumePairList", "number_assets": 5, "sort_key": "bidVolume"},
], "BTC", ['TKN/BTC', 'ETH/BTC']),
# SpreadFilter
([{"method": "VolumePairList", "number_assets": 5, "sort_key": "quoteVolume"},
{"method": "SpreadFilter", "max_spread": 0.005}
], "USDT", ['ETH/USDT']),
])
def test_VolumePairList_whitelist_gen(mocker, whitelist_conf, shitcoinmarkets, tickers,
pairlists, base_currency, whitelist_result,