diff --git a/public/assets/wallet.js b/public/assets/wallet.js
index 0299428..a13fdd7 100644
--- a/public/assets/wallet.js
+++ b/public/assets/wallet.js
@@ -161,6 +161,13 @@ window.IAPWallet = (function () {
     await ensureChain(c);
     const tx = { from: addr, to: c.contract, data };
     if (valueWei) tx.value = '0x' + BigInt(valueWei).toString(16);
+    // Polygon (mainnet + Amoy) enforce a ~25 gwei minimum priority fee; wallets
+    // routinely lowball it and the RPC rejects "gas tip below minimum". Set
+    // explicit EIP-1559 fees above the floor, plus a safe gas limit so the wallet
+    // doesn't mis-estimate. Unused gas is never charged.
+    tx.maxPriorityFeePerGas = '0x' + (30n * 10n ** 9n).toString(16); // 30 gwei
+    tx.maxFeePerGas = '0x' + (250n * 10n ** 9n).toString(16);        // 250 gwei ceiling
+    tx.gas = '0x' + (600000n).toString(16);                          // 600k limit
     return eth().request({ method: 'eth_sendTransaction', params: [tx] });
   }
   async function waitTx(hash) {
diff --git a/public/index.html b/public/index.html
index 115e79c..7e1c822 100644
--- a/public/index.html
+++ b/public/index.html
@@ -439,7 +439,7 @@
 </section>
 
 <script src="/assets/common.js?v=20260908c"></script>
-<script src="/assets/wallet.js?v=20260908d"></script>
+<script src="/assets/wallet.js?v=20260908e"></script>
 <script src="/assets/home.js?v=20260906m"></script>
 <script src="/assets/chat.js?v=20260906m"></script>
 </body>
diff --git a/public/my.html b/public/my.html
index 242a854..f25e06d 100644
--- a/public/my.html
+++ b/public/my.html
@@ -690,7 +690,7 @@
   </div>
 </div>
 <script src="/assets/common.js?v=20260908c"></script>
-<script src="/assets/wallet.js?v=20260908d"></script>
+<script src="/assets/wallet.js?v=20260908e"></script>
 <script src="/assets/my.js?v=20260908i"></script>
 <script src="/assets/chat.js?v=20260907l"></script>
 </body>