diff --git a/src/contracts/Datatoken4.ts b/src/contracts/Datatoken4.ts
index 7416aeb0..2993734e 100644
--- a/src/contracts/Datatoken4.ts
+++ b/src/contracts/Datatoken4.ts
@@ -85,7 +85,7 @@ export class Datatoken4 extends Datatoken {
       estGas,
       this.signer,
       this.config?.gasFeeMultiplier,
-      dtContract.setAllowListContract,
+      dtContract.functions.setAllowListContract,
       address
     )
 
@@ -119,7 +119,7 @@ export class Datatoken4 extends Datatoken {
       estGas,
       this.signer,
       this.config?.gasFeeMultiplier,
-      dtContract.setDenyListContract,
+      dtContract.functions.setDenyListContract,
       address
     )
 
@@ -144,14 +144,14 @@ export class Datatoken4 extends Datatoken {
     }
 
     const dtContract = this.getContract(dtAddress)
-    const estGas = await dtContract.estimateGas.setFileObject(fileObject)
+    const estGas = await dtContract.estimateGas.setFilesObject(fileObject)
     if (estimateGas) return <ReceiptOrEstimate<G>>estGas
 
     const trxReceipt = await sendTx(
       estGas,
       this.signer,
       this.config?.gasFeeMultiplier,
-      dtContract.setFileObject,
+      dtContract.functions.setFilesObject,
       fileObject
     )
 
diff --git a/src/utils/ContractUtils.ts b/src/utils/ContractUtils.ts
index fa4e18b4..f1243538 100644
--- a/src/utils/ContractUtils.ts
+++ b/src/utils/ContractUtils.ts
@@ -5,9 +5,12 @@ import { LoggerInstance, minAbi } from '.'
 
 const MIN_GAS_FEE_POLYGON = 30000000000 // minimum recommended 30 gwei polygon main and mumbai fees
 const MIN_GAS_FEE_SEPOLIA = 4000000000 // minimum 4 gwei for eth sepolia testnet
+const MIN_GAS_FEE_SAPPHIRE = 10000000000 // recommended for mainnet and testnet 10 gwei
 const POLYGON_NETWORK_ID = 137
 const MUMBAI_NETWORK_ID = 80001
 const SEPOLIA_NETWORK_ID = 11155111
+const SAPPHIRE_TESTNET_NETWORK_ID = 23295
+const SAPPHIRE_MAINNET_NETWORK_ID = 23294
 
 export function setContractDefaults(contract: Contract, config: Config): Contract {
   // TO DO - since ethers does not provide this
@@ -139,6 +142,10 @@ export async function sendTx(
           : chainId === SEPOLIA_NETWORK_ID &&
             Number(aggressiveFeePriorityFeePerGas) < MIN_GAS_FEE_SEPOLIA
           ? MIN_GAS_FEE_SEPOLIA
+          : (chainId === SAPPHIRE_MAINNET_NETWORK_ID ||
+              chainId === SAPPHIRE_TESTNET_NETWORK_ID) &&
+            Number(aggressiveFeePriorityFeePerGas) < MIN_GAS_FEE_SAPPHIRE
+          ? MIN_GAS_FEE_SAPPHIRE
           : Number(aggressiveFeePriorityFeePerGas),
 
       maxFeePerGas:
@@ -148,6 +155,10 @@ export async function sendTx(
           : chainId === SEPOLIA_NETWORK_ID &&
             Number(aggressiveFeePerGas) < MIN_GAS_FEE_SEPOLIA
           ? MIN_GAS_FEE_SEPOLIA
+          : (chainId === SAPPHIRE_MAINNET_NETWORK_ID ||
+              chainId === SAPPHIRE_TESTNET_NETWORK_ID) &&
+            Number(aggressiveFeePerGas) < MIN_GAS_FEE_SAPPHIRE
+          ? MIN_GAS_FEE_SAPPHIRE
           : Number(aggressiveFeePerGas)
     }
   } else {