add class Pair in venues, PAIRTYPES for future uses

piker/brokers/deribit/venues.py

@@ -56,25 +56,44 @@ def get_api_eps(venue: MarketType) -> tuple[str, str]:
     }[venue]
 
 
-class OptionPair(Struct, frozen=True, kw_only=True):
+class Pair(Struct, frozen=True, kw_only=True):
 
     symbol: str
-    venue: str
 
     # src
-    quote_currency: str
+    quote_currency: str # 'BTC'
 
     # dst
-    base_currency: str
+    settlement_currency: str # "BTC",
 
     tick_size: float # 0.0001
-    tick_size_steps: list[dict] # [{'above_price': 0.005, 'tick_size': 0.0005}]
+    tick_size_steps: list[dict[str, str | int | float]] # [{'above_price': 0.005, 'tick_size': 0.0005}]
+
+    @property
+    def price_tick(self) -> Decimal:
+        step_size: str = self.tick_size_steps[0].get('above_price')
+        return Decimal(step_size)
+
+    @property
+    def size_tick(self) -> Decimal:
+        step_size: str = self.tick_size_steps[0].get('tick_size')
+        return Decimal(step_size)
+
+    @property
+    def bs_fqme(self) -> str:
+        return self.symbol
+
+    @property
+    def bs_mktid(self) -> str:
+        return f'{self.symbol}.{self.venue}'
+
+
+class OptionPair(Struct, frozen=True, kw_only=True):
+
     taker_commission: float # 0.0003
     strike: float # 5000.0
     settlement_period: str # 'day'
-    settlement_currency: str # "BTC",
     rfq: bool # false
-    quote_currency: str # 'BTC'
     price_index: str # 'btc_usd'
     option_type: str # 'call'
     min_trade_amount: float # 0.1
@@ -110,10 +129,13 @@ class OptionPair(Struct, frozen=True, kw_only=True):
 
     @property
     def bs_dst_asset(self) -> str:
-        return f'{self.base_currency}'
+        return f'{self.settlement_currency}'
     
     @property
     def bs_mktid(self) -> str:
         return f'{self.symbol}.{self.venue}'
 
 
+PAIRTYPES: dict[MarketType, Pair] = {
+    'option': OptionPair,
+}