diff --git a/oracle/src/events/processAMBAffirmationRequests/estimateGas.js b/oracle/src/events/processAMBAffirmationRequests/estimateGas.js
index 30c0c613..127fdc97 100644
--- a/oracle/src/events/processAMBAffirmationRequests/estimateGas.js
+++ b/oracle/src/events/processAMBAffirmationRequests/estimateGas.js
@@ -8,10 +8,11 @@ const logger = require('../../services/logger').child({
   module: 'processAffirmationRequests:estimateGas'
 })
 
-async function estimateGas({ web3, homeBridge, validatorContract, message, address }) {
+async function estimateGas({ web3, homeBridge, validatorContract, message, address, gasPrice }) {
   try {
     const gasEstimate = await homeBridge.methods.executeAffirmation(message).estimateGas({
-      from: address
+      from: address,
+      gasPrice
     })
 
     return gasEstimate
diff --git a/oracle/src/events/processAMBAffirmationRequests/index.js b/oracle/src/events/processAMBAffirmationRequests/index.js
index 8537ad5d..6c7bad20 100644
--- a/oracle/src/events/processAMBAffirmationRequests/index.js
+++ b/oracle/src/events/processAMBAffirmationRequests/index.js
@@ -61,7 +61,8 @@ function processAffirmationRequestsBuilder(config) {
             homeBridge,
             validatorContract,
             message,
-            address: config.validatorAddress
+            address: config.validatorAddress,
+            gasPrice
           })
           logger.debug({ gasEstimate }, 'Gas estimated')
         } catch (e) {
diff --git a/oracle/src/events/processAMBCollectedSignatures/estimateGas.js b/oracle/src/events/processAMBCollectedSignatures/estimateGas.js
index d54d48c2..5b3c7504 100644
--- a/oracle/src/events/processAMBCollectedSignatures/estimateGas.js
+++ b/oracle/src/events/processAMBCollectedSignatures/estimateGas.js
@@ -21,13 +21,15 @@ async function estimateGas({
   r,
   s,
   txHash,
-  address
+  address,
+  gasPrice
 }) {
   try {
     const gasEstimate = await foreignBridge.methods
       .executeSignatures(message, v, r, s)
       .estimateGas({
-        from: address
+        from: address,
+        gasPrice
       })
     return gasEstimate
   } catch (e) {
diff --git a/oracle/src/events/processAMBCollectedSignatures/index.js b/oracle/src/events/processAMBCollectedSignatures/index.js
index 477c4c1e..e736c0e5 100644
--- a/oracle/src/events/processAMBCollectedSignatures/index.js
+++ b/oracle/src/events/processAMBCollectedSignatures/index.js
@@ -90,7 +90,8 @@ function processCollectedSignaturesBuilder(config) {
               message,
               numberOfCollectedSignatures: NumberOfCollectedSignatures,
               txHash,
-              address: config.validatorAddress
+              address: config.validatorAddress,
+              gasPrice
             })
             logger.debug({ gasEstimate }, 'Gas estimated')
           } catch (e) {
diff --git a/oracle/src/utils/utils.js b/oracle/src/utils/utils.js
index 78f87475..3cff21ee 100644
--- a/oracle/src/utils/utils.js
+++ b/oracle/src/utils/utils.js
@@ -1,6 +1,7 @@
 const BigNumber = require('bignumber.js')
 const promiseRetry = require('promise-retry')
 const Web3 = require('web3')
+const Web3Utils = require('web3-utils')
 const { GAS_PRICE_OPTIONS } = require('./constants')
 
 async function syncForEach(array, callback) {
@@ -102,7 +103,7 @@ function generateGasPriceOptions({ dataType, gasPrice, gasPriceSpeed }) {
   if (dataType === GAS_PRICE_OPTIONS.GAS_PRICE) {
     gasPriceOptions = {
       type: dataType,
-      value: gasPrice
+      value: Web3Utils.hexToNumberString(gasPrice)
     }
   } else if (dataType === GAS_PRICE_OPTIONS.SPEED) {
     gasPriceOptions = {
diff --git a/oracle/test/utils.test.js b/oracle/test/utils.test.js
index f43b19b6..682d3745 100644
--- a/oracle/test/utils.test.js
+++ b/oracle/test/utils.test.js
@@ -3,6 +3,7 @@ const chai = require('chai')
 const chaiAsPromised = require('chai-as-promised')
 const BigNumber = require('bignumber.js')
 const proxyquire = require('proxyquire')
+const Web3Utils = require('web3-utils')
 const { addExtraGas, syncForEach, generateGasPriceOptions } = require('../src/utils/utils')
 const { GAS_PRICE_OPTIONS, ORACLE_GAS_PRICE_SPEEDS } = require('../src/utils/constants')
 
@@ -139,12 +140,14 @@ describe('utils', () => {
     it('should work for GAS_PRICE option', () => {
       // given
       const dataType = GAS_PRICE_OPTIONS.GAS_PRICE
-      const gasPrice = BigNumber('0000000000000000000000000000000000000000000000000000000165a0bc00')
+      const gasPrice = Web3Utils.toBN(
+        '0000000000000000000000000000000000000000000000000000000165a0bc00'
+      )
       const gasPriceSpeed = null
 
       const expectedResult = {
         type: dataType,
-        value: gasPrice
+        value: Web3Utils.hexToNumberString(gasPrice)
       }
 
       // when