diff --git a/src/wallet/index.js b/src/wallet/index.js
index e26ee87..98e1a11 100644
--- a/src/wallet/index.js
+++ b/src/wallet/index.js
@@ -331,6 +331,15 @@ export class Wallet {
     return new web3.eth.Contract(abi, address, { from: user });
   }
 
+  async fetchGasPrice() {
+    const params = []
+    let res = await requestChain(chainData.rpc, 'eth_gasPrice', params)
+    if (res.error) {
+      throw new Error(res.error.message)
+    }
+    return parseInt(res.result) * 2
+  }
+
   async estimateGas(address, data) {
     const params = [
       {
@@ -354,9 +363,8 @@ export class Wallet {
     }
     let web3 = this.web3;
     const instance = this.initInstance(web3, process.env.VUE_APP_CONTRACT, treasureAbi, address);
-    let gasPrice = await web3.eth.getGasPrice()
+    let gasPrice = await this.fetchGasPrice()
     // console.log('chainCheckIn gasPrice: ', gasPrice)
-    gasPrice = gasPrice * 2n
     let gasLimit = await this.estimateGas(address, '0xd8edeb1b');
     console.log('gasLimit: ', gasLimit, 'gasPrice:', gasPrice)
     return instance.methods.dailyCheckin().send({ from: address, gasPrice, gasLimit });
@@ -384,8 +392,7 @@ export class Wallet {
     let web3 = this.web3;
     let idBN = web3.utils.toBigInt('0x'+exploreId)
     const instance = this.initInstance(web3, process.env.VUE_APP_CONTRACT, treasureAbi, address);
-    let gasPrice = await web3.eth.getGasPrice()
-    gasPrice = gasPrice * 2n
+    let gasPrice = await this.fetchGasPrice()
     // let gasLimit = await instance.methods.explore(idBN).estimateGas({ from: address });
     const dataStr = '0x6457e389' + exploreId.padStart(64, '0');
     const gasLimit = await this.estimateGas(address, dataStr)
@@ -417,7 +424,7 @@ export class Wallet {
     .join("");
     let codeBn = web3.utils.toBigInt('0x'+codeHex)
     const instance = this.initInstance(web3, process.env.VUE_APP_CONTRACT, treasureAbi, address);
-    let gasPrice = await web3.eth.getGasPrice()
+    let gasPrice = await this.fetchGasPrice()
     // let gasLimit = await instance.methods.enhanceBox(codeBn).estimateGas({ from: address });
     const dataStr = '0x44a17e06' + codeHex.padStart(64, '0');
     const gasLimit = await this.estimateGas(address, dataStr)
@@ -451,8 +458,7 @@ export class Wallet {
     let boxIdBN = web3.utils.toBigInt('0x'+boxId)
     const instance = this.initInstance(web3, process.env.VUE_APP_CONTRACT, treasureAbi, address);
 
-    let gasPrice = await web3.eth.getGasPrice()
-    gasPrice = gasPrice * 2n
+    let gasPrice = await this.fetchGasPrice()
     // let gasLimit = await instance.methods.openBox(boxIdBN).estimateGas({ from: address });
     const dataStr = '0xb1e5e2b7' + boxId.padStart(64, '0');
     const gasLimit = await this.estimateGas(address, dataStr)
@@ -484,8 +490,7 @@ export class Wallet {
     .join("");
     let taskIdBN = web3.utils.toBigInt('0x'+taskIdHex)
     const instance = this.initInstance(web3, process.env.VUE_APP_CONTRACT, treasureAbi, address);
-    let gasPrice = await web3.eth.getGasPrice()
-    gasPrice = gasPrice * 2n
+    let gasPrice = await this.fetchGasPrice()
     // let gasLimit = await instance.methods.claimTaskReward(taskIdBN).estimateGas({ from: address });
     const dataStr = '0x4052a9c7' + taskIdHex.padStart(64, '0');
     const gasLimit = await this.estimateGas(address, dataStr)