diff --git a/src/services/wdk-service/index.ts b/src/services/wdk-service/index.ts
index 5ae8528..9396219 100644
--- a/src/services/wdk-service/index.ts
+++ b/src/services/wdk-service/index.ts
@@ -117,6 +117,24 @@ class WDKService {
     return this.config.indexer.apiKey;
   }
 
+  // Maps network key to blockchain name expected by the indexer API
+  private getIndexerBlockchainName(networkType: string): string {
+    const chainsConfig = this.getChainsConfig();
+    if (chainsConfig?.ethereum?.chainId === 11155111 && networkType === 'ethereum') {
+      return 'sepolia';
+    }
+    return networkType;
+  }
+
+  // Reverse-maps indexer blockchain name back to internal network key
+  private fromIndexerBlockchainName(blockchain: string): string {
+    const chainsConfig = this.getChainsConfig();
+    if (chainsConfig?.ethereum?.chainId === 11155111 && blockchain === 'sepolia') {
+      return 'ethereum';
+    }
+    return blockchain;
+  }
+
   private getChainsConfig(): any {
     if (!this.config) {
       throw new Error('WDK Service config not set');
@@ -649,7 +667,7 @@ class WDKService {
 
         if (address) {
           payload.push({
-            blockchain: networkType,
+            blockchain: this.getIndexerBlockchainName(networkType),
             token: asset,
             address,
             limit: 100,
@@ -718,7 +736,7 @@ class WDKService {
         const address = networkAddresses[networkType as NetworkType];
         if (address) {
           payload.push({
-            blockchain: networkType,
+            blockchain: this.getIndexerBlockchainName(networkType),
             token: asset,
             address,
           });
@@ -751,7 +769,8 @@ class WDKService {
     ).reduce(
       (allBalances, [_, value]) => {
         const obj = (value as any).tokenBalance;
-        allBalances[`${obj.blockchain}_${obj.token}`] = {
+        const networkKey = this.fromIndexerBlockchainName(obj.blockchain);
+        allBalances[`${networkKey}_${obj.token}`] = {
           balance: parseFloat(obj.amount),
           asset: obj.token as AssetTicker,
         };