diff --git a/engine/paima-mw-core/src/wallets/evm.ts b/engine/paima-mw-core/src/wallets/evm.ts
index e562b1872..1628bc9f9 100644
--- a/engine/paima-mw-core/src/wallets/evm.ts
+++ b/engine/paima-mw-core/src/wallets/evm.ts
@@ -48,7 +48,8 @@ async function switchChain(): Promise<boolean> {
               decimals: getChainCurrencyDecimals(),
             },
             rpcUrls: [getChainUri()],
-            blockExplorerUrls: [getChainExplorerUri()],
+            // blockExplorerUrls: Chain not added with empty string.
+            blockExplorerUrls: getChainExplorerUri() ? [getChainExplorerUri()] : undefined,
           });
         return await verifyWalletChain();
       } catch (addError) {
diff --git a/engine/paima-providers/src/errors.ts b/engine/paima-providers/src/errors.ts
index f8d83b7cd..d5442810a 100644
--- a/engine/paima-providers/src/errors.ts
+++ b/engine/paima-providers/src/errors.ts
@@ -17,8 +17,13 @@ export class ProviderNotInitialized extends Error {
   }
 }
 export class ProviderApiError extends Error {
-  constructor(message?: string) {
+  public code: number | undefined;
+
+  constructor(message?: string, code?: number) {
     super(message);
     this.name = 'ProviderApiError';
+    if (code) {
+      this.code = code;
+    }
   }
 }
diff --git a/engine/paima-providers/src/evm.ts b/engine/paima-providers/src/evm.ts
index 9978d93ae..62586f86a 100644
--- a/engine/paima-providers/src/evm.ts
+++ b/engine/paima-providers/src/evm.ts
@@ -161,17 +161,19 @@ export class EvmProvider implements IProvider<EvmApi> {
       const walletChain = await this.conn.api.request({ method: 'eth_chainId' });
       return parseInt(walletChain as string, 16) === parseInt(this.gameInfo.gameChainId, 16);
     } catch (e: any) {
-      throw new ProviderApiError(`[verifyWalletChain] error: ${e?.message}`);
+      // eslint-disable-next-line @typescript-eslint/no-unsafe-argument
+      throw new ProviderApiError(`[verifyWalletChain] error: ${e?.message}`, e?.code);
     }
   };
   addChain = async (newChain: AddEthereumChainParameter): Promise<void> => {
     try {
       await this.conn.api.request({
-        method: 'eth_chainId',
+        method: 'wallet_addEthereumChain',
         params: [newChain],
       });
     } catch (e: any) {
-      throw new ProviderApiError(`[addChain] error: ${e?.message}`);
+      // eslint-disable-next-line @typescript-eslint/no-unsafe-argument
+      throw new ProviderApiError(`[addChain] error: ${e?.message}`, e?.code);
     }
   };
   switchChain = async (hexChainId: string): Promise<void> => {
@@ -181,7 +183,8 @@ export class EvmProvider implements IProvider<EvmApi> {
         params: [{ chainId: hexChainId }],
       });
     } catch (e: any) {
-      throw new ProviderApiError(`[switchChain] error: ${e?.message}`);
+      // eslint-disable-next-line @typescript-eslint/no-unsafe-argument
+      throw new ProviderApiError(`[switchChain] error: ${e?.message}`, e?.code);
     }
   };
   sendTransaction = async (tx: Record<string, any>): Promise<string> => {
@@ -199,7 +202,8 @@ export class EvmProvider implements IProvider<EvmApi> {
       }
       return hash;
     } catch (e: any) {
-      throw new ProviderApiError(`[switchChain] error: ${e?.message}`);
+      // eslint-disable-next-line @typescript-eslint/no-unsafe-argument
+      throw new ProviderApiError(`[switchChain] error: ${e?.message}`, e?.code);
     }
   };
 }
diff --git a/engine/paima-utils/src/config.ts b/engine/paima-utils/src/config.ts
index 500ce0f18..c7a048226 100644
--- a/engine/paima-utils/src/config.ts
+++ b/engine/paima-utils/src/config.ts
@@ -17,7 +17,7 @@ export class ENV {
     return process.env.CHAIN_URI || '';
   }
   static get CHAIN_NAME(): string {
-    return process.env.CHAIN_NAME || '';
+    return process.env.CHAIN_NAME || 'UNKNOWN_CHAIN_NAME';
   }
   static get CHAIN_ID(): number {
     return parseInt(process.env.CHAIN_ID || '0', 10);
@@ -26,10 +26,10 @@ export class ENV {
     return process.env.CHAIN_EXPLORER_URI || '';
   }
   static get CHAIN_CURRENCY_NAME(): string {
-    return process.env.CHAIN_CURRENCY_NAME || '';
+    return process.env.CHAIN_CURRENCY_NAME || 'UNKNOWN_CURRENCY_NAME';
   }
   static get CHAIN_CURRENCY_SYMBOL(): string {
-    return process.env.CHAIN_CURRENCY_SYMBOL || '';
+    return process.env.CHAIN_CURRENCY_SYMBOL || 'NONAME';
   }
   static get CHAIN_CURRENCY_DECIMALS(): number {
     return parseInt(process.env.CHAIN_CURRENCY_DECIMALS || '0', 10);