diff --git a/src/standards/JCStandard.ts b/src/standards/JCStandard.ts
index 74b057c..bf23f6a 100644
--- a/src/standards/JCStandard.ts
+++ b/src/standards/JCStandard.ts
@@ -8,6 +8,8 @@ import { abiMarket } from "../abis/abiMarket";
 import { abiMall } from "../abis/abiMall";
 import { abiGameMarket } from "../abis/abiGameMarket";
 import { abiGameMall } from "../abis/abiGameMall";
+import { ZError } from "../common/ZError";
+import { abiERC20 } from "../abis/abiERC20";
 
 export class JCStandard {
   private web3: Web3;
@@ -239,9 +241,26 @@ export class JCStandard {
       gas = await contract.methods.buy(orderId).estimateGas();
     }
     gas = (gas * 1.1) | 1;
-    if (estimate) {
-      return jc.wallet.generateGasShow(gas);
+    // begin of increase allowance
+    let orderInfo = await contract.methods.orderInfos(orderId).call();
+    if (!orderInfo.orderId) {
+      throw new ZError(100, `order info with id: ${orderId} not found`);
     }
+    const tokenInstance = new this.web3.eth.Contract(
+      abiERC20,
+      orderInfo.currency
+    );
+    let gasApprove = await tokenInstance.methods
+      .approve(addressMarket, orderInfo.price)
+      .estimateGas();
+    gasApprove = (gasApprove * 1.1) | 1;
+    if (estimate) {
+      return jc.wallet.generateGasShow(gas + gasApprove);
+    }
+
+    await tokenInstance.methods
+      .approve(addressMarket, orderInfo.price)
+      .send({ gas: gasApprove });
 
     let details = [
       {
@@ -287,9 +306,19 @@ export class JCStandard {
       gas = await contract.methods.buyNFT(addresses, values).estimateGas();
     }
     gas = (gas * 1.1) | 1;
+
+    const tokenInstance = new this.web3.eth.Contract(abiERC20, addresses[2]);
+    let gasApprove = await tokenInstance.methods
+      .approve(addressMall, values[1])
+      .estimateGas();
+    gasApprove = (gasApprove * 1.1) | 1;
+
     if (estimate) {
-      return jc.wallet.generateGasShow(gas);
+      return jc.wallet.generateGasShow(gas + gasApprove);
     }
+    await tokenInstance.methods
+      .approve(addressMall, values[1])
+      .sent({ gas: gasApprove });
 
     let details = [
       {
@@ -362,8 +391,15 @@ export class JCStandard {
         .estimateGas();
     }
     gas = (gas * 1.1) | 1;
+
+    const tokenInstance = new this.web3.eth.Contract(abiERC20, currency);
+    let gasApprove = await tokenInstance.methods
+      .approve(addressGameMarket, price)
+      .estimateGas();
+    gasApprove = (gasApprove * 1.1) | 1;
+
     if (estimate) {
-      return jc.wallet.generateGasShow(gas);
+      return jc.wallet.generateGasShow(gas + gasApprove);
     }
 
     let details = [
@@ -379,6 +415,9 @@ export class JCStandard {
       title: "game_market_buy",
       details: details,
     };
+    await tokenInstance.methods
+      .approve(addressGameMarket, price)
+      .send({ gas: gasApprove });
     return universalChainCb(
       logData,
       contract.methods
@@ -421,8 +460,13 @@ export class JCStandard {
         .estimateGas();
     }
     gas = (gas * 1.1) | 1;
+    const tokenInstance = new this.web3.eth.Contract(abiERC20, currency);
+    let gasApprove = await tokenInstance.methods
+      .approve(addressGameMall, price)
+      .estimateGas();
+    gasApprove = (gasApprove * 1.1) | 1;
     if (estimate) {
-      return jc.wallet.generateGasShow(gas);
+      return jc.wallet.generateGasShow(gas + gasApprove);
     }
     // TOTO::
     let details = [
@@ -438,6 +482,9 @@ export class JCStandard {
       title: "game_mall_buy",
       details: details,
     };
+    await tokenInstance.methods
+      .approve(addressGameMall, price)
+      .send({ gas: gasApprove });
     return universalChainCb(
       logData,
       contract.methods