diff --git a/src/tokens/Datatoken.ts b/src/tokens/Datatoken.ts
index b63e911cc..ecd2bd4ea 100644
--- a/src/tokens/Datatoken.ts
+++ b/src/tokens/Datatoken.ts
@@ -10,7 +10,8 @@ import {
   getFairGasPrice,
   setContractDefaults,
   configHelperNetworks,
-  getFreOrderParams
+  getFreOrderParams,
+  estimateGas
 } from '../utils'
 import {
   ConsumeMarketFee,
@@ -95,17 +96,12 @@ export class Datatoken {
         this.config
       )
 
-    // Estimate gas cost for mint method
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .approve(spender, this.web3.utils.toWei(amount))
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-    return estGas
+    return estimateGas(
+      address,
+      dtContract.methods.approve,
+      spender,
+      this.web3.utils.toWei(amount)
+    )
   }
 
   /**
@@ -127,12 +123,11 @@ export class Datatoken {
       this.config
     )
 
-    const estGas = await this.estGasApprove(
-      dtAddress,
-      spender,
-      amount,
+    const estGas = await estimateGas(
       address,
-      dtContract
+      dtContract.methods.approve,
+      spender,
+      this.web3.utils.toWei(amount)
     )
 
     // Call mint contract method
@@ -169,17 +164,12 @@ export class Datatoken {
         this.config
       )
 
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .mint(toAddress || address, this.web3.utils.toWei(amount))
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-
-    return estGas
+    return estimateGas(
+      address,
+      dtContract.methods.mint,
+      toAddress || address,
+      this.web3.utils.toWei(amount)
+    )
   }
 
   /**
@@ -204,37 +194,28 @@ export class Datatoken {
         this.config
       )
 
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-
     if (!fixedRateParams.allowedConsumer)
       fixedRateParams.allowedConsumer = '0x0000000000000000000000000000000000000000'
     const withMint = fixedRateParams.withMint ? 1 : 0
 
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .createFixedRate(
-          fixedRateParams.fixedRateAddress,
-          [
-            fixedRateParams.baseTokenAddress,
-            address,
-            fixedRateParams.marketFeeCollector,
-            fixedRateParams.allowedConsumer
-          ],
-          [
-            fixedRateParams.baseTokenDecimals,
-            fixedRateParams.datatokenDecimals,
-            fixedRateParams.fixedRate,
-            fixedRateParams.marketFee,
-            withMint
-          ]
-        )
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-
-    return estGas
+    return estimateGas(
+      address,
+      dtContract.methods.createFixedRate,
+      fixedRateParams.fixedRateAddress,
+      [
+        fixedRateParams.baseTokenAddress,
+        address,
+        fixedRateParams.marketFeeCollector,
+        fixedRateParams.allowedConsumer
+      ],
+      [
+        fixedRateParams.baseTokenDecimals,
+        fixedRateParams.datatokenDecimals,
+        fixedRateParams.fixedRate,
+        fixedRateParams.marketFee,
+        withMint
+      ]
+    )
   }
 
   /**
@@ -264,11 +245,23 @@ export class Datatoken {
 
     // should check ERC20Deployer role using erc721 level ..
 
-    const estGas = await this.estGasCreateFixedRate(
-      dtAddress,
+    const estGas = await estimateGas(
       address,
-      fixedRateParams,
-      dtContract
+      dtContract.methods.createFixedRate,
+      fixedRateParams.fixedRateAddress,
+      [
+        fixedRateParams.baseTokenAddress,
+        fixedRateParams.owner,
+        fixedRateParams.marketFeeCollector,
+        fixedRateParams.allowedConsumer
+      ],
+      [
+        fixedRateParams.baseTokenDecimals,
+        fixedRateParams.datatokenDecimals,
+        fixedRateParams.fixedRate,
+        fixedRateParams.marketFee,
+        withMint
+      ]
     )
 
     // Call createFixedRate contract method
@@ -325,23 +318,15 @@ export class Datatoken {
 
     if (!dispenserParams.withMint) dispenserParams.withMint = false
 
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .createDispenser(
-          dispenserAddress,
-          dispenserParams.maxTokens,
-          dispenserParams.maxBalance,
-          dispenserParams.withMint,
-          dispenserParams.allowedSwapper
-        )
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-
-    return estGas
+    return estimateGas(
+      address,
+      dtContract.methods.createDispenser,
+      dispenserAddress,
+      dispenserParams.maxTokens,
+      dispenserParams.maxBalance,
+      dispenserParams.withMint,
+      dispenserParams.allowedSwapper
+    )
   }
 
   /**
@@ -374,12 +359,14 @@ export class Datatoken {
 
     // should check ERC20Deployer role using erc721 level ..
 
-    const estGas = await this.estGasCreateDispenser(
-      dtAddress,
+    const estGas = await estimateGas(
       address,
+      dtContract.methods.createDispenser,
       dispenserAddress,
-      dispenserParams,
-      dtContract
+      dispenserParams.maxTokens,
+      dispenserParams.maxBalance,
+      dispenserParams.withMint,
+      dispenserParams.allowedSwapper
     )
 
     // Call createFixedRate contract method
@@ -424,12 +411,11 @@ export class Datatoken {
 
     const capAvailble = await this.getCap(dtAddress)
     if (new Decimal(capAvailble).gte(amount)) {
-      const estGas = await this.estGasMint(
-        dtAddress,
+      const estGas = await estimateGas(
         address,
-        amount,
-        toAddress,
-        dtContract
+        dtContract.methods.mint,
+        toAddress || address,
+        this.web3.utils.toWei(amount)
       )
 
       // Call mint contract method
@@ -467,17 +453,7 @@ export class Datatoken {
         this.config
       )
 
-    // Estimate gas cost for addMinter method
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .addMinter(minter)
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-    return estGas
+    return estimateGas(address, dtContract.methods.addMinter, minter)
   }
 
   /**
@@ -502,7 +478,7 @@ export class Datatoken {
       throw new Error(`Caller is not ERC20Deployer`)
     }
     // Estimate gas cost for addMinter method
-    const estGas = await this.estGasAddMinter(dtAddress, address, minter, dtContract)
+    const estGas = await estimateGas(address, dtContract.methods.addMinter, minter)
 
     // Call addMinter function of the contract
     const trxReceipt = await dtContract.methods.addMinter(minter).send({
@@ -537,18 +513,7 @@ export class Datatoken {
 
     // should check ERC20Deployer role using erc721 level ..
 
-    // Estimate gas for removeMinter method
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .removeMinter(minter)
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-
-    return estGas
+    return estimateGas(address, dtContract.methods.removeMinter, minter)
   }
 
   /**
@@ -574,7 +539,7 @@ export class Datatoken {
       throw new Error(`Caller is not ERC20Deployer`)
     }
 
-    const estGas = await this.estGasRemoveMinter(dtAddress, address, minter, dtContract)
+    const estGas = await estimateGas(address, dtContract.methods.removeMinter, minter)
 
     // Call dtContract function of the contract
     const trxReceipt = await dtContract.methods.removeMinter(minter).send({
@@ -607,18 +572,7 @@ export class Datatoken {
         this.config
       )
 
-    // Estimate gas for addFeeManager method
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .addPaymentManager(paymentManager)
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-
-    return estGas
+    return estimateGas(address, dtContract.methods.addPaymentManager, paymentManager)
   }
 
   /**
@@ -643,11 +597,10 @@ export class Datatoken {
       throw new Error(`Caller is not ERC20Deployer`)
     }
 
-    const estGas = await this.estGasAddPaymentManager(
-      dtAddress,
+    const estGas = await estimateGas(
       address,
-      paymentManager,
-      dtContract
+      dtContract.methods.addPaymentManager,
+      paymentManager
     )
 
     // Call addPaymentManager function of the contract
@@ -681,16 +634,7 @@ export class Datatoken {
         this.config
       )
 
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .removePaymentManager(paymentManager)
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-    return estGas
+    return estimateGas(address, dtContract.methods.removePaymentManager, paymentManager)
   }
 
   /**
@@ -715,11 +659,10 @@ export class Datatoken {
       throw new Error(`Caller is not ERC20Deployer`)
     }
 
-    const estGas = await this.estGasRemovePaymentManager(
-      dtAddress,
+    const estGas = await estimateGas(
       address,
-      paymentManager,
-      dtContract
+      dtContract.methods.removePaymentManager,
+      paymentManager
     )
 
     // Call removeFeeManager function of the contract
@@ -755,16 +698,7 @@ export class Datatoken {
         this.config
       )
 
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .setPaymentCollector(paymentCollector)
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-    return estGas
+    return estimateGas(address, dtContract.methods.setPaymentCollector, paymentCollector)
   }
 
   /**
@@ -789,11 +723,10 @@ export class Datatoken {
       throw new Error(`Caller is not Fee Manager`)
     }
 
-    const estGas = await this.estGasSetPaymentCollector(
-      dtAddress,
+    const estGas = await estimateGas(
       address,
-      paymentCollector,
-      dtContract
+      dtContract.methods.setPaymentCollector,
+      paymentCollector
     )
 
     // Call setFeeCollector method of the contract
@@ -862,16 +795,7 @@ export class Datatoken {
         this.config
       )
 
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .transfer(toAddress, amount)
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-    return estGas
+    return estimateGas(address, dtContract.methods.transfer, toAddress, amount)
   }
 
   /**
@@ -893,12 +817,11 @@ export class Datatoken {
       this.config
     )
     try {
-      const estGas = await this.estGasTransfer(
-        dtAddress,
-        toAddress,
-        amount,
+      const estGas = await estimateGas(
         address,
-        dtContract
+        dtContract.methods.transfer,
+        toAddress,
+        amount
       )
       // Call transfer function of the contract
       const trxReceipt = await dtContract.methods.transfer(toAddress, amount).send({
@@ -939,17 +862,14 @@ export class Datatoken {
         this.config
       )
 
-    // Estimate gas for startOrder method
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .startOrder(consumer, serviceIndex, providerFees, consumeMarketFee)
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-    return estGas
+    return estimateGas(
+      address,
+      dtContract.methods.startOrder,
+      consumer,
+      serviceIndex,
+      providerFees,
+      consumeMarketFee
+    )
   }
 
   /** Start Order: called by payer or consumer prior ordering a service consume on a marketplace.
@@ -981,14 +901,13 @@ export class Datatoken {
       }
     }
     try {
-      const estGas = await this.estGasStartOrder(
-        dtAddress,
+      const estGas = await estimateGas(
         address,
+        dtContract.methods.startOrder,
         consumer,
         serviceIndex,
         providerFees,
-        consumeMarketFee,
-        dtContract
+        consumeMarketFee
       )
 
       const trxReceipt = await dtContract.methods
@@ -1024,17 +943,12 @@ export class Datatoken {
       contractInstance ||
       new this.web3.eth.Contract(this.datatokensEnterpriseAbi, dtAddress)
 
-    // Estimate gas for startOrder method
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .buyFromFreAndOrder(orderParams, freParams)
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-    return estGas
+    return estimateGas(
+      address,
+      dtContract.methods.buyFromFreAndOrder,
+      orderParams,
+      freParams
+    )
   }
 
   /** Buys 1 DT from the FRE and then startsOrder, while burning that DT
@@ -1054,12 +968,11 @@ export class Datatoken {
     try {
       const freContractParams = getFreOrderParams(freParams)
 
-      const estGas = await this.estGasBuyFromFreAndOrder(
-        dtAddress,
+      const estGas = await estimateGas(
         address,
+        dtContract.methods.buyFromFreAndOrder,
         orderParams,
-        freContractParams,
-        dtContract
+        freContractParams
       )
 
       const trxReceipt = await dtContract.methods
@@ -1095,17 +1008,12 @@ export class Datatoken {
       contractInstance ||
       new this.web3.eth.Contract(this.datatokensEnterpriseAbi, dtAddress)
 
-    // Estimate gas for startOrder method
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .buyFromDispenserAndOrder(orderParams, dispenserContract)
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-    return estGas
+    return estimateGas(
+      address,
+      dtContract.methods.buyFromDispenserAndOrder,
+      orderParams,
+      dispenserContract
+    )
   }
 
   /** Gets DT from dispenser and then startsOrder, while burning that DT
@@ -1123,12 +1031,11 @@ export class Datatoken {
   ): Promise<TransactionReceipt> {
     const dtContract = new this.web3.eth.Contract(this.datatokensEnterpriseAbi, dtAddress)
     try {
-      const estGas = await this.estGasBuyFromDispenserAndOrder(
-        dtAddress,
+      const estGas = await estimateGas(
         address,
+        dtContract.methods.buyFromDispenserAndOrder,
         orderParams,
-        dispenserContract,
-        dtContract
+        dispenserContract
       )
 
       const trxReceipt = await dtContract.methods
@@ -1165,16 +1072,7 @@ export class Datatoken {
         this.config
       )
 
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .setData(value)
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-    return estGas
+    return estimateGas(address, dtContract.methods.setData, value)
   }
 
   /** setData
@@ -1199,7 +1097,7 @@ export class Datatoken {
       this.config
     )
 
-    const estGas = await this.estGasSetData(dtAddress, address, value, dtContract)
+    const estGas = await estimateGas(address, dtContract.methods.setData, value)
 
     // Call setData function of the contract
     const trxReceipt = await dtContract.methods.setData(value).send({
@@ -1229,17 +1127,7 @@ export class Datatoken {
         this.config
       )
 
-    const gasLimitDefault = this.GASLIMIT_DEFAULT
-    let estGas
-    try {
-      estGas = await dtContract.methods
-        .cleanPermissions()
-        .estimateGas({ from: address }, (err, estGas) => (err ? gasLimitDefault : estGas))
-    } catch (e) {
-      estGas = gasLimitDefault
-    }
-
-    return estGas
+    return estimateGas(address, dtContract.methods.cleanPermissions)
   }
 
   /**
@@ -1261,7 +1149,7 @@ export class Datatoken {
       this.config
     )
 
-    const estGas = await this.estGasCleanPermissions(dtAddress, address, dtContract)
+    const estGas = await estimateGas(address, dtContract.methods.cleanPermissions)
 
     // Call cleanPermissions function of the contract
     const trxReceipt = await dtContract.methods.cleanPermissions().send({