get_assets refactor

piker/brokers/deribit/api.py

@@ -302,20 +302,32 @@ class Client:
 
         return balances
 
-    async def get_assets(self) -> dict[str, float]:
+    async def get_assets(
+        self,
+        venue: str | None = None,
+
+    ) -> dict[str, Asset]:
         """Return the set of asset balances for this account
         by symbol.
         """
-        balances = {}
+        assets = {}
-
-        for currency in self.currencies:
         resp = await self.json_rpc(
-                'private/get_account_summary', params={
+            'private/get_account_summaries',
-                    'currency': currency.upper()})
+            params={
+                'extended' : True
+            }
+        )
+        summaries = resp.result['summaries']
+        for summary in summaries:
+            currency = summary['currency']
+            tx_tick = Decimal('1e-08')
+            atype='crypto_currency'
+            assets[currency] = Asset(
+                name=currency,
+                atype=atype,
+                tx_tick=tx_tick)
+        return assets 
 
-            balances[currency] = resp.result['balance']
-
-        return balances
 
     async def submit_limit(
         self,