diff --git a/src/config/cfg_421613_dev.js b/src/config/cfg_421613_dev.js
index 08565f6..8430336 100644
--- a/src/config/cfg_421613_dev.js
+++ b/src/config/cfg_421613_dev.js
@@ -36,9 +36,17 @@ module.exports = {
   ],
   contracts: {
     minterFactory: "0x1A27515c35a92Fb276c2670fa27C85ffAd75D094",
-    nftmarket: "0x1d33b4E045ce595B6346C3D0e334814dd4Af5418",
+    nftmarket: "0x28cd862Baa826e65a0c0F1179B9A3423dF4d366A",
     nftmall: "0x38Bf9f3C29D8384B6A79435745AE796cd2465545",
     gamemarket: "0x46e2C612756b702b3d68d89F97c88FFa725F6fab",
     gamemall: "0x1D058c7c7451c34BbfF9c0dF1C16b95C5d171d64",
   },
+  gasInfo: {
+    nftApprove: 49340,
+    cecApprove: 46962,
+    marketSellNFT: 270740,
+    marketCancelOrder: 119027,
+    marketUpdatePrice: 41272,
+    marketBuy: 207735,
+  },
 };
diff --git a/src/config/constants.ts b/src/config/constants.ts
index fe99e9c..66a39d1 100644
--- a/src/config/constants.ts
+++ b/src/config/constants.ts
@@ -17,3 +17,5 @@ export const ZERO_ADDRESS = "0x0000000000000000000000000000000000000000";
 export const AVAILABLE_CHAINS = [80001, 421613, 137, 42161];
 
 export const BASE_TOKEN_URI = "https://market.cebg.games/api/nft/info/";
+
+export const GAS_BOOST = 1.2;
diff --git a/src/standards/JCStandard.ts b/src/standards/JCStandard.ts
index bf23f6a..5d32651 100644
--- a/src/standards/JCStandard.ts
+++ b/src/standards/JCStandard.ts
@@ -1,7 +1,7 @@
 import assert from "assert";
 import Web3 from "web3";
 import { abiMinterFactory } from "../abis/abiUserMinterFactory";
-import { ZERO_ADDRESS } from "../config/constants";
+import { GAS_BOOST, ZERO_ADDRESS } from "../config/constants";
 import { getAddressByName, universalChainCb } from "../util/chain.util";
 import { SAMPLE_GAS } from "./ChainCommon";
 import { abiMarket } from "../abis/abiMarket";
@@ -10,6 +10,7 @@ import { abiGameMarket } from "../abis/abiGameMarket";
 import { abiGameMall } from "../abis/abiGameMall";
 import { ZError } from "../common/ZError";
 import { abiERC20 } from "../abis/abiERC20";
+import { abiERC721 } from "../abis/abiERC721";
 
 export class JCStandard {
   private web3: Web3;
@@ -51,7 +52,7 @@ export class JCStandard {
         .mintNft(address, tokenIds, startTime, saltNonce, signature)
         .estimateGas();
     }
-    gas = (gas * 1.1) | 1;
+    gas = (gas * GAS_BOOST) | 1;
     if (estimate) {
       return jc.wallet.generateGasShow(gas);
     }
@@ -96,20 +97,34 @@ export class JCStandard {
     estimate: number;
   }) {
     const cfg = jc.wallet.currentChainCfg;
+    estimate = parseInt(estimate + "");
     const addressMarket = cfg.contracts.nftmarket;
     console.log("addressMarket:: ", addressMarket);
     const contract = new this.web3.eth.Contract(abiMarket, addressMarket, {
       //@ts-ignore
       from: jc.wallet.currentAccAddr,
     });
-    if (!gas) {
-      gas = await contract.methods
-        .sell(nftToken, currency, tokenId, price, amount)
-        .estimateGas();
+    const tokenInstance = new this.web3.eth.Contract(abiERC721, nftToken, {
+      //@ts-ignore
+      from: jc.wallet.currentAccAddr,
+    });
+    let approved = await tokenInstance.methods.getApproved(tokenId);
+    let gasApprove = 0;
+    if (approved != addressMarket) {
+      gasApprove = cfg.gasInfo.nftApprove;
+      gasApprove = (gasApprove * GAS_BOOST) | 1;
     }
-    gas = (gas * 1.1) | 1;
+
+    if (!gas) {
+      gas = cfg.gasInfo.marketSellNFT;
+      // gas = await contract.methods
+      //   .sell(nftToken, currency, tokenId, price, amount)
+      //   .estimateGas();
+    }
+    gas = (gas * GAS_BOOST) | 1;
+
     if (estimate) {
-      return jc.wallet.generateGasShow(gas);
+      return jc.wallet.generateGasShow(gas + gasApprove);
     }
 
     let details = [
@@ -125,6 +140,12 @@ export class JCStandard {
       title: "market_sell",
       details: details,
     };
+    if (approved != addressMarket) {
+      await tokenInstance.methods
+        .approve(addressMarket, tokenId)
+        .send({ gas: gasApprove });
+      console.log("approve done");
+    }
     return universalChainCb(
       logData,
       contract.methods
@@ -145,6 +166,7 @@ export class JCStandard {
     estimate: number;
   }) {
     const cfg = jc.wallet.currentChainCfg;
+    estimate = parseInt(estimate + "");
     const addressMarket = cfg.contracts.nftmarket;
     console.log("addressMarket:: ", addressMarket);
     const contract = new this.web3.eth.Contract(abiMarket, addressMarket, {
@@ -152,9 +174,10 @@ export class JCStandard {
       from: jc.wallet.currentAccAddr,
     });
     if (!gas) {
-      gas = await contract.methods.updatePrice(orderId, price).estimateGas();
+      // gas = await contract.methods.updatePrice(orderId, price).estimateGas();
+      gas = cfg.gasInfo.marketUpdatePrice;
     }
-    gas = (gas * 1.1) | 1;
+    gas = (gas * GAS_BOOST) | 1;
     if (estimate) {
       return jc.wallet.generateGasShow(gas);
     }
@@ -188,6 +211,7 @@ export class JCStandard {
     estimate: number;
   }) {
     const cfg = jc.wallet.currentChainCfg;
+    estimate = parseInt(estimate + "");
     const addressMarket = cfg.contracts.nftmarket;
     console.log("addressMarket:: ", addressMarket);
     const contract = new this.web3.eth.Contract(abiMarket, addressMarket, {
@@ -196,8 +220,9 @@ export class JCStandard {
     });
     if (!gas) {
       gas = await contract.methods.cancelOrder(orderId).estimateGas();
+      // gas = cfg.gasInfo.marketCancelOrder;
     }
-    gas = (gas * 1.1) | 1;
+    gas = (gas * GAS_BOOST) | 1;
     if (estimate) {
       return jc.wallet.generateGasShow(gas);
     }
@@ -231,37 +256,45 @@ export class JCStandard {
     estimate: number;
   }) {
     const cfg = jc.wallet.currentChainCfg;
+    estimate = parseInt(estimate + "");
     const addressMarket = cfg.contracts.nftmarket;
     console.log("addressMarket:: ", addressMarket);
     const contract = new this.web3.eth.Contract(abiMarket, addressMarket, {
       //@ts-ignore
       from: jc.wallet.currentAccAddr,
     });
-    if (!gas) {
-      gas = await contract.methods.buy(orderId).estimateGas();
-    }
-    gas = (gas * 1.1) | 1;
-    // 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
+      orderInfo.currency,
+      {
+        //@ts-ignore
+        from: jc.wallet.currentAccAddr,
+      }
     );
-    let gasApprove = await tokenInstance.methods
-      .approve(addressMarket, orderInfo.price)
-      .estimateGas();
-    gasApprove = (gasApprove * 1.1) | 1;
+    let approved = await tokenInstance.methods
+      .allowance(jc.wallet.currentAccAddr, addressMarket)
+      .call();
+    console.log("approved:: ", approved);
+    let gasApprove = 0;
+    if (approved < orderInfo.price) {
+      gasApprove = cfg.gasInfo.cecApprove;
+    }
+    gasApprove = (gasApprove * GAS_BOOST) | 1;
+    if (!gas) {
+      // gas = await contract.methods.buy(orderId).estimateGas();
+      gas = cfg.gasInfo.marketBuy;
+    }
+    gas = (gas * GAS_BOOST) | 1;
+    // begin of increase allowance
+
     if (estimate) {
       return jc.wallet.generateGasShow(gas + gasApprove);
     }
 
-    await tokenInstance.methods
-      .approve(addressMarket, orderInfo.price)
-      .send({ gas: gasApprove });
-
     let details = [
       {
         address: addressMarket,
@@ -275,6 +308,11 @@ export class JCStandard {
       title: "market_buy",
       details: details,
     };
+    if (approved < orderInfo.price) {
+      await tokenInstance.methods
+        .approve(addressMarket, orderInfo.price)
+        .send({ gas: gasApprove });
+    }
     return universalChainCb(
       logData,
       contract.methods.buy(orderId).send({ gas })
@@ -296,6 +334,7 @@ export class JCStandard {
     estimate: number;
   }) {
     const cfg = jc.wallet.currentChainCfg;
+    estimate = parseInt(estimate + "");
     const addressMall = cfg.contracts.nftmall;
     console.log("addressMall:: ", addressMall);
     const contract = new this.web3.eth.Contract(abiMall, addressMall, {
@@ -305,13 +344,13 @@ export class JCStandard {
     if (!gas) {
       gas = await contract.methods.buyNFT(addresses, values).estimateGas();
     }
-    gas = (gas * 1.1) | 1;
+    gas = (gas * GAS_BOOST) | 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;
+    gasApprove = (gasApprove * GAS_BOOST) | 1;
 
     if (estimate) {
       return jc.wallet.generateGasShow(gas + gasApprove);
@@ -375,6 +414,7 @@ export class JCStandard {
     estimate: number;
   }) {
     const cfg = jc.wallet.currentChainCfg;
+    estimate = parseInt(estimate + "");
     const addressGameMarket = cfg.contracts.gamemarket;
     console.log("addressGameMarket:: ", addressGameMarket);
     const contract = new this.web3.eth.Contract(
@@ -390,13 +430,13 @@ export class JCStandard {
         .buy(orderId, seller, currency, price, startTime, saltNonce, signature)
         .estimateGas();
     }
-    gas = (gas * 1.1) | 1;
+    gas = (gas * GAS_BOOST) | 1;
 
     const tokenInstance = new this.web3.eth.Contract(abiERC20, currency);
     let gasApprove = await tokenInstance.methods
       .approve(addressGameMarket, price)
       .estimateGas();
-    gasApprove = (gasApprove * 1.1) | 1;
+    gasApprove = (gasApprove * GAS_BOOST) | 1;
 
     if (estimate) {
       return jc.wallet.generateGasShow(gas + gasApprove);
@@ -448,6 +488,7 @@ export class JCStandard {
     estimate: number;
   }) {
     const cfg = jc.wallet.currentChainCfg;
+    estimate = parseInt(estimate + "");
     const addressGameMall = cfg.contracts.gamemall;
     console.log("addressGameMall:: ", addressGameMall);
     const contract = new this.web3.eth.Contract(abiGameMall, addressGameMall, {
@@ -459,12 +500,12 @@ export class JCStandard {
         .buy(orderId, currency, price, startTime, saltNonce, signature)
         .estimateGas();
     }
-    gas = (gas * 1.1) | 1;
+    gas = (gas * GAS_BOOST) | 1;
     const tokenInstance = new this.web3.eth.Contract(abiERC20, currency);
     let gasApprove = await tokenInstance.methods
       .approve(addressGameMall, price)
       .estimateGas();
-    gasApprove = (gasApprove * 1.1) | 1;
+    gasApprove = (gasApprove * GAS_BOOST) | 1;
     if (estimate) {
       return jc.wallet.generateGasShow(gas + gasApprove);
     }