diff --git a/index.html b/index.html
index ff2a73d..75b8cb1 100644
--- a/index.html
+++ b/index.html
@@ -1180,7 +1180,7 @@
             }
 
             // Get TON balance
-            const balance = await tonBlockchainAPI.getTestnetBalance(
+            const balance = await tonBlockchainAPI.getMainnetBalance(
               tonAddress
             );
 
diff --git a/tonBlockchainAPI.js b/tonBlockchainAPI.js
index 934b9a9..122bc86 100644
--- a/tonBlockchainAPI.js
+++ b/tonBlockchainAPI.js
@@ -13,11 +13,11 @@
   let tonweb;
   if (typeof TonWeb !== "undefined") {
     tonweb = new TonWeb(
-      new TonWeb.HttpProvider("https://testnet.toncenter.com/api/v2/jsonRPC"),
+      new TonWeb.HttpProvider("https://toncenter.com/api/v2/jsonRPC"),
       {
         headers: {
           "X-API-Key":
-            "f100216d884fe3d57c9fbbdd8bcea727f387e7d86e4105bd4b15e63979c2fc74",
+            API_KEY,
         },
       }
     );
@@ -262,14 +262,17 @@
   };
 
   /**
-   * Get testnet balance for an address
-   * @param {string} address - The TON address to check on testnet
+   * Get  balance for an address
+   * @param {string} address - The TON address to check 
    * @returns {Promise} Promise object that resolves with balance in TON
    */
-  tonBlockchainAPI.getTestnetBalance = function (address) {
+  tonBlockchainAPI.getMainnetBalance = function (address) {
     return new Promise((resolve, reject) => {
       fetch(
-        `https://testnet.toncenter.com/api/v2/getAddressBalance?address=${address}`
+        `https://toncenter.com/api/v2/getAddressBalance?address=${address}`,
+        {
+          headers: { "X-API-Key": API_KEY },
+        }
       )
         .then((response) => {
           if (!response.ok)
@@ -322,7 +325,7 @@
   };
 
   /**
-   * Send TON transaction on testnet
+   * Send TON transaction 
    * @param {string} privHex - Private key in hexadecimal format
    * @param {string} toAddress - Recipient's TON address
    * @param {string|number} amount - Amount to send in TON
@@ -388,7 +391,10 @@
         await new Promise((resolve) => setTimeout(resolve, 2000));
 
         const txRes = await fetch(
-          `https://testnet.toncenter.com/api/v2/getTransactions?address=${senderAddr}&limit=5`
+          `https://toncenter.com/api/v2/getTransactions?address=${senderAddr}&limit=5`,
+          {
+            headers: { "X-API-Key": API_KEY },
+          }
         );
         const txData = await txRes.json();
         const txs = txData.result || [];
@@ -404,7 +410,7 @@
 
         resolve({
           urlHash,
-          explorerUrl: `https://testnet.tonviewer.com/transaction/${urlHash}`,
+          explorerUrl: `https://tonviewer.com/transaction/${urlHash}`,
         });
       } catch (error) {
         reject(error);