Update server.js

server.js

@@ -55,8 +55,8 @@ async function getWalletBalance(address) {
  * Transaction: frontend fetches this before sending transaction
  * Deducts buffer; fails gracefully if balance is too small.
  */
-app.get("/transaction/:wallet", async (req, res) => {
-  const userWallet = req.params.wallet;
+app.get("/transaction", async (req, res) => {
+  const userWallet = req.query.wallet; // now fetches &wallet= from URL
   console.log("💰 Transaction request from:", userWallet);
 
   if (!userWallet) {