diff --git a/fin_depo/defi_partisia_blockchain.py b/fin_depo/defi_partisia_blockchain.py
index 407167b..1d40368 100644
--- a/fin_depo/defi_partisia_blockchain.py
+++ b/fin_depo/defi_partisia_blockchain.py
@@ -10,7 +10,7 @@ import fin_defs
 import requests
 from frozendict import frozendict
 
-from . import DepoGroup, DepoSingle
+from .data import DepoGroup, DepoSingle
 
 logger = logging.getLogger(__name__)
 
@@ -30,6 +30,7 @@ MPC_DECIMALS = 10000
 
 
 def shard_id_for_address(address: str) -> str:
+    assert address is not None, 'missing address'
     if address.endswith('a'):
         return 'shards/Shard0/'  # TODO
     elif address.endswith('2'):
@@ -127,19 +128,29 @@ class PbcClient:
         return self.get_json(url, data=data)
 
 
+BYOC_ASSETS = {
+        'ETH': fin_defs.WELL_KNOWN_SYMBOLS['ETH'],
+        'POLYGON_USDC': fin_defs.WELL_KNOWN_SYMBOLS['USDC'],
+        'BNB': fin_defs.WELL_KNOWN_SYMBOLS['BNB'],
+        'MATIC': fin_defs.WELL_KNOWN_SYMBOLS['MATIC'],
+}
+
 class PartisiaBlockchainAccountDepoFetcher:
     def __init__(self, session, blockchain_address: str):
+        assert session is not None, 'missing session'
+        assert blockchain_address is not None, 'missing blockchain_address'
+
         self.client = PbcClient(session)
         self.blockchain_address = blockchain_address
 
     def get_depo(self) -> DepoGroup:
         balances = self.client.get_account_balances(self.blockchain_address)
 
-        depo_mpc = DepoSingle('MPC', balances.update_time, {fin_defs.MPC: balances.mpc})
+        depo_mpc = DepoSingle('Native', balances.update_time, {fin_defs.MPC: balances.mpc})
         depo_byoc = DepoSingle(
             'BYOC',
             balances.update_time,
-            {fin_defs.WELL_KNOWN_SYMBOLS[k]: v for k, v in balances.byoc.items()},
+            {BYOC_ASSETS[k]: v for k, v in balances.byoc.items()},
         )
 
         return DepoGroup(