diff --git a/package-lock.json b/package-lock.json
index 0ac9ca5..e0da20c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -569,12 +569,22 @@
       "resolved": "https://registry.npmjs.org/bech32/-/bech32-1.1.4.tgz",
       "integrity": "sha512-s0IrSOzLlbvX7yp4WBfPITzpAU8sqQcpsmwXDiKwrG4r491vwCO/XpejasRNl0piBMe/DvP4Tz0mIS/X1DPJBQ=="
     },
+    "big-integer": {
+      "version": "1.6.48",
+      "resolved": "https://registry.npmjs.org/big-integer/-/big-integer-1.6.48.tgz",
+      "integrity": "sha512-j51egjPa7/i+RdiRuJbPdJ2FIUYYPhvYLjzoYbcMMm62ooO6F94fETG4MTs46zPAF9Brs04OajboA/qTGuz78w=="
+    },
     "binary-extensions": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
       "integrity": "sha512-jDctJ/IVQbZoJykoeHbhXpOlNBqGNcwXJKJog42E5HDPUwQTSdjCHdihjj0DlnheQ7blbT6dHOafNAiS8ooQKA==",
       "dev": true
     },
+    "blakejs": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/blakejs/-/blakejs-1.1.0.tgz",
+      "integrity": "sha1-ad+S75U6qIylGjLfarHFShVfx6U="
+    },
     "bn.js": {
       "version": "4.12.0",
       "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
@@ -1028,6 +1038,16 @@
       "integrity": "sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc=",
       "dev": true
     },
+    "ffjavascript": {
+      "version": "0.2.35",
+      "resolved": "https://registry.npmjs.org/ffjavascript/-/ffjavascript-0.2.35.tgz",
+      "integrity": "sha512-xnC51tWbi0ah4SH+02jEfJyO+P+NiZWnxQrLDLtBYY1Dv3QM5ydxzd+gxnLEfWdT8i1bMM5pIh5P25l6fNCaVQ==",
+      "requires": {
+        "big-integer": "^1.6.48",
+        "wasmcurves": "0.0.14",
+        "web-worker": "^1.0.0"
+      }
+    },
     "file-entry-cache": {
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-6.0.1.tgz",
@@ -2647,6 +2667,20 @@
       "integrity": "sha512-l8lCEmLcLYZh4nbunNZvQCJc5pv7+RCwa8q/LdUx8u7lsWvPDKmpodJAJNwkAhJC//dFY48KuIEmjtd4RViDrA==",
       "dev": true
     },
+    "wasmcurves": {
+      "version": "0.0.14",
+      "resolved": "https://registry.npmjs.org/wasmcurves/-/wasmcurves-0.0.14.tgz",
+      "integrity": "sha512-G1iMkxlRaQSdqQ1JrwHcU+awLmwyH6kFKfT8g9obd8MWe+u5oSdFXrODB0zmSI5aGGvJPG+4cAmqCGYv9R+7qg==",
+      "requires": {
+        "big-integer": "^1.6.42",
+        "blakejs": "^1.1.0"
+      }
+    },
+    "web-worker": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/web-worker/-/web-worker-1.0.0.tgz",
+      "integrity": "sha512-BzuMqeKVkKKwHV6tJuwePFcxYMxvC97D448mXTgh/CxXAB4sRtoV26gRPN+JDxsXRR7QZyioMV9O6NzQaASf7Q=="
+    },
     "which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
diff --git a/package.json b/package.json
index ff8a73c..543e2af 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
   "dependencies": {
     "dotenv": "^8.2.0",
     "ethers": "^5.0.12",
+    "ffjavascript": "^0.2.35",
     "yargs": "^16.2.0"
   },
   "devDependencies": {
diff --git a/src/biddingCLI.js b/src/biddingCLI.js
index 4e724a4..43aa789 100644
--- a/src/biddingCLI.js
+++ b/src/biddingCLI.js
@@ -1,6 +1,7 @@
 const path = require("path");
 require("dotenv").config({path:path.join(__dirname, "../config/.env")});
 const { ethers } = require("ethers");
+const { getGasPrice } = require("./utils");
 const addressSC = require("../config/addressSC.json");
 var yargs = require("yargs")
     .usage(`
@@ -75,6 +76,7 @@ commands
     .option("min", { alias: "minBid", describe: "minimum that you want to bid", type: "string", demandOption: false })
     .option("p", { alias: "usePermit", describe: "enable permit feature (default true)", type: "boolean", demandOption: false, default: true })
     .option("u", { alias: "units", describe: "choose unit type, wei or ether supported", type: "string", demandOption: false, default: "ether" })
+    .option("m", { alias: "multiplier", describe: "gasPrice multiplier", type: "number", demandOption: false, default: 1 })
     .option("all", { alias: "all", describe: "bool if the user want to display only his bids or all the current bids", type: "bool", demandOption: false, default: false });
 
 
@@ -88,6 +90,7 @@ const slotSets = argv.slotSets ? slotSets.split(",") : [true, true, true, true,
 const usePermit = argv.usePermit;
 const units = argv.units;
 const allBool = argv.all;
+const multiplier = argv.multiplier;
 
 let amount = argv.amount;
 let bidAmount = argv.bidAmount;
@@ -177,10 +180,15 @@ async function main() {
     }
 
     if(command === "REGISTER") {
+    // set options
+    const options = {
+        gasPrice: await getGasPrice(multiplier, provider)
+    }
+
     // register coordinator
         const res = await HermezAuctionContract
             .connect(wallet)
-            .setCoordinator(wallet.address, url);
+            .setCoordinator(wallet.address, url, options);
         await printEtherscanTx(res, network.chainId);
     }
 
@@ -219,11 +227,17 @@ async function main() {
 
     if(command === "BID") {
         try {
+            // set options
+            const options = {
+                gasPrice: await getGasPrice(multiplier, provider)
+            }
+
             const res = await HermezAuctionContract.connect(wallet).processBid(
                 amount,
                 slot,
                 bidAmount,
-                dataPermit
+                dataPermit,
+                options
             );
             await printEtherscanTx(res, network.chainId);
         } catch (error) {
@@ -234,6 +248,11 @@ async function main() {
     }
     else if(command === "MULTIBID") {
         try {
+            // set options
+            const options = {
+                gasPrice: await getGasPrice(multiplier, provider)
+            }
+
             const res = await HermezAuctionContract.connect(wallet).processMultiBid(
                 amount,
                 startingSlot,
@@ -241,7 +260,8 @@ async function main() {
                 slotSets,
                 maxBid,
                 minBid,
-                dataPermit
+                dataPermit,
+                options
             );
             await printEtherscanTx(res, network.chainId);
         } catch (error) {
@@ -260,7 +280,12 @@ async function main() {
     }
     else if(command === "CLAIMHEZ") {
         try {
-            const res = await HermezAuctionContract.connect(wallet).claimHEZ();
+            // set options
+            const options = {
+                gasPrice: await getGasPrice(multiplier, provider)
+            }
+
+            const res = await HermezAuctionContract.connect(wallet).claimHEZ(options);
             await printEtherscanTx(res, network.chainId);
         } catch (error) {
             console.log("gas estimation failed");
diff --git a/src/utils.js b/src/utils.js
new file mode 100644
index 0000000..b9b535e
--- /dev/null
+++ b/src/utils.js
@@ -0,0 +1,19 @@
+const Scalar = require("ffjavascript").Scalar;
+
+/**
+ * Get current average gas price from the last ethereum blocks and multiply it
+ * @param {Number} multiplier - multiply the average gas price by this parameter
+ * @param {Object} provider - Provider Object retinrd by 'ethers'
+ * @returns {Promise} - promise will return the gas price obtained.
+ */
+async function getGasPrice (multiplier, provider) {
+    const strAvgGas = await provider.getGasPrice()
+    const avgGas = Scalar.e(strAvgGas)
+    const res = (avgGas * Scalar.e(multiplier))
+    const retValue = res.toString()
+    return retValue
+}
+
+module.exports = {
+    getGasPrice
+};
\ No newline at end of file