diff --git a/src/contracts/Dispenser.ts b/src/contracts/Dispenser.ts
index 7e646168..d63a1f73 100644
--- a/src/contracts/Dispenser.ts
+++ b/src/contracts/Dispenser.ts
@@ -57,19 +57,19 @@ export class Dispenser extends SmartContractWithAddress {
     if (estimateGas) return estGas
 
     // Call createFixedRate contract method
-    const trxReceipt = await this.contract.methods
-      .create(
-        dtAddress,
-        this.web3.utils.toWei(maxTokens),
-        this.web3.utils.toWei(maxBalance),
-        address,
-        allowedSwapper
-      )
-      .send({
-        from: address,
-        gas: estGas + 1,
-        gasPrice: await this.getFairGasPrice()
-      })
+    const trxReceipt = await sendTx(
+      address,
+      estGas + 1,
+      this.web3,
+      this.config,
+      this.contract.methods.create,
+      dtAddress,
+      this.web3.utils.toWei(maxTokens),
+      this.web3.utils.toWei(maxBalance),
+      address,
+      allowedSwapper
+    )
+
     return trxReceipt
   }
 
@@ -97,17 +97,17 @@ export class Dispenser extends SmartContractWithAddress {
     )
     if (estimateGas) return estGas
 
-    const trxReceipt = await this.contract.methods
-      .activate(
-        dtAddress,
-        this.web3.utils.toWei(maxTokens),
-        this.web3.utils.toWei(maxBalance)
-      )
-      .send({
-        from: address,
-        gas: estGas + 1,
-        gasPrice: await this.getFairGasPrice()
-      })
+    const trxReceipt = await sendTx(
+      address,
+      estGas + 1,
+      this.web3,
+      this.config,
+      this.contract.methods.activate,
+      dtAddress,
+      this.web3.utils.toWei(maxTokens),
+      this.web3.utils.toWei(maxBalance)
+    )
+
     return trxReceipt
   }
 
@@ -129,11 +129,15 @@ export class Dispenser extends SmartContractWithAddress {
     )
     if (estimateGas) return estGas
 
-    const trxReceipt = await this.contract.methods.deactivate(dtAddress).send({
-      from: address,
-      gas: estGas + 1,
-      gasPrice: await this.getFairGasPrice()
-    })
+    const trxReceipt = await sendTx(
+      address,
+      estGas + 1,
+      this.web3,
+      this.config,
+      this.contract.methods.deactivate,
+      dtAddress
+    )
+
     return trxReceipt
   }
 
@@ -158,13 +162,15 @@ export class Dispenser extends SmartContractWithAddress {
     )
     if (estimateGas) return estGas
 
-    const trxReceipt = await this.contract.methods
-      .setAllowedSwapper(dtAddress, newAllowedSwapper)
-      .send({
-        from: address,
-        gas: estGas + 1,
-        gasPrice: await this.getFairGasPrice()
-      })
+    const trxReceipt = await sendTx(
+      address,
+      estGas + 1,
+      this.web3,
+      this.config,
+      this.contract.methods.setAllowedSwapper,
+      dtAddress,
+      newAllowedSwapper
+    )
     return trxReceipt
   }
 
@@ -194,13 +200,16 @@ export class Dispenser extends SmartContractWithAddress {
     )
     if (estimateGas) return estGas
 
-    const trxReceipt = await this.contract.methods
-      .dispense(dtAddress, this.web3.utils.toWei(amount), destination)
-      .send({
-        from: address,
-        gas: estGas + 1,
-        gasPrice: await this.getFairGasPrice()
-      })
+    const trxReceipt = await sendTx(
+      address,
+      estGas + 1,
+      this.web3,
+      this.config,
+      this.contract.methods.dispense,
+      dtAddress,
+      this.web3.utils.toWei(amount),
+      destination
+    )
     return trxReceipt
   }
 
@@ -222,11 +231,15 @@ export class Dispenser extends SmartContractWithAddress {
     )
     if (estimateGas) return estGas
 
-    const trxReceipt = await this.contract.methods.ownerWithdraw(dtAddress).send({
-      from: address,
-      gas: estGas + 1,
-      gasPrice: await this.getFairGasPrice()
-    })
+    const trxReceipt = await sendTx(
+      address,
+      estGas + 1,
+      this.web3,
+      this.config,
+      this.contract.methods.ownerWithdraw,
+      dtAddress
+    )
+
     return trxReceipt
   }
 
diff --git a/src/contracts/NFT.ts b/src/contracts/NFT.ts
index 93c36871..ef28653f 100644
--- a/src/contracts/NFT.ts
+++ b/src/contracts/NFT.ts
@@ -770,12 +770,15 @@ export class Nft extends SmartContract {
       valueHex
     )
 
-    // Call setData function of the contract
-    const trxReceipt = await nftContract.methods.setNewData(keyHash, valueHex).send({
-      from: address,
-      gas: estGas + 1,
-      gasPrice: await this.getFairGasPrice()
-    })
+    const trxReceipt = await sendTx(
+      address,
+      estGas + 1,
+      this.web3,
+      this.config,
+      nftContract.methods.setNewData,
+      keyHash,
+      valueHex
+    )
 
     return trxReceipt
   }
diff --git a/src/utils/TokenUtils.ts b/src/utils/TokenUtils.ts
index 324e5c4d..0b14b5c7 100644
--- a/src/utils/TokenUtils.ts
+++ b/src/utils/TokenUtils.ts
@@ -96,11 +96,15 @@ export async function approveWei<G extends boolean = false>(
   if (estimateGas) return estGas
 
   try {
-    result = await tokenContract.methods.approve(spender, amount).send({
-      from: account,
-      gas: estGas + 1,
-      gasPrice: await getFairGasPrice(web3, null)
-    })
+    result = await sendTx(
+      account,
+      estGas + 1,
+      this.web3,
+      this.config,
+      tokenContract.methods.approve,
+      spender,
+      amount
+    )
   } catch (e) {
     LoggerInstance.error(
       `ERROR: Failed to approve spender to spend tokens : ${e.message}`