feat(stores-eth): add currency registration check in ERC20 balance queries

Implemented a new method to verify if a currency is registered before proceeding with balance fetching in both ObservableQueryEthereumERC20BalanceImpl and ObservableQueryThirdpartyERC20BalancesImpl. This prevents unnecessary calls when the currency has been removed, enhancing efficiency.

Author: piatoss3612

packages/stores-eth/src/queries/erc20-balance.ts

@@ -111,6 +111,8 @@ export class ObservableQueryEthereumERC20BalanceImpl
   }
 
   protected async ensureFetched(): Promise<void> {
+    // balanceImplMap doesn't evict on currency removal.
+    if (!this.isCurrencyRegistered()) return;
     // Force temporary registration so imperative callers (outside a reactive
     // observer) still trigger an actual eth_call.
     this.parent.addContract(this.contractAddress);
@@ -121,6 +123,15 @@ export class ObservableQueryEthereumERC20BalanceImpl
     }
   }
 
+  protected isCurrencyRegistered(): boolean {
+    const target = DenomHelper.normalizeDenom(this.denomHelper.denom);
+    return this.chainGetter
+      .getModularChain(this.chainId)
+      .currencies.some(
+        (c) => DenomHelper.normalizeDenom(c.coinMinimalDenom) === target
+      );
+  }
+
   fetch(): Promise<void> {
     return this.ensureFetched();
   }

packages/stores-eth/src/queries/erc20-balances.ts

@@ -322,6 +322,8 @@ export class ObservableQueryThirdpartyERC20BalancesImpl
   // observation-driven reaction) so imperative callers also exercise the
   // batch fallback for tokens missing from Alchemy.
   protected async awaitFallbackIfMissing(): Promise<void> {
+    // balanceImplMap doesn't evict on currency removal.
+    if (!this.isCurrencyRegistered()) return;
     const contract = this.denomHelper.contractAddress;
     // Mirror the reaction: an Alchemy error forces fallback even when a
     // stale response still advertises the contract as covered.
@@ -338,6 +340,15 @@ export class ObservableQueryThirdpartyERC20BalancesImpl
     }
   }
 
+  protected isCurrencyRegistered(): boolean {
+    const target = DenomHelper.normalizeDenom(this.denomHelper.denom);
+    return this.chainGetter
+      .getModularChain(this.chainId)
+      .currencies.some(
+        (c) => DenomHelper.normalizeDenom(c.coinMinimalDenom) === target
+      );
+  }
+
   async waitFreshResponse(): Promise<
     Readonly<QueryResponse<unknown>> | undefined
   > {