diff --git a/eth-connector/src/contract.rs b/eth-connector/src/contract.rs
index 16d93a1..175c772 100644
--- a/eth-connector/src/contract.rs
+++ b/eth-connector/src/contract.rs
@@ -9,7 +9,6 @@ use crate::operation::{
     ViewStorageBalanceBounds, ViewStorageBalanceOf,
 };
 use crate::types::{MigrationInputData, PausedMask, Proof};
-use aurora_engine_types::account_id::AccountId;
 use aurora_engine_types::types::Address;
 use aurora_workspace_utils::{Contract, ContractId};
 use near_contract_standards::fungible_token::metadata::FungibleTokenMetadata;
@@ -42,16 +41,16 @@ impl ContractId for EthConnectorContract {
 impl EthConnectorContract {
     pub fn init(
         &self,
-        prover_account: AccountId,
+        prover_account: &impl AsRef<str>,
         eth_custodian_address: String,
         metadata: FungibleTokenMetadata,
-        account_with_access_right: &AccountId,
-        owner_id: AccountId,
+        account_with_access_right: &impl AsRef<str>,
+        owner_id: &impl AsRef<str>,
     ) -> CallNew {
         CallNew::call(&self.contract).args_json(json!({
-            "prover_account": prover_account,
-            "account_with_access_right": account_with_access_right,
-            "owner_id": owner_id,
+            "prover_account": prover_account.as_ref(),
+            "account_with_access_right": account_with_access_right.as_ref(),
+            "owner_id": owner_id.as_ref(),
             "eth_custodian_address": eth_custodian_address,
             "metadata": metadata,
         }))
@@ -59,23 +58,24 @@ impl EthConnectorContract {
 
     pub fn ft_transfer(
         &self,
-        receiver_id: AccountId,
+        receiver_id: &impl AsRef<str>,
         amount: U128,
         memo: Option<String>,
     ) -> CallFtTransfer {
-        CallFtTransfer::call(&self.contract)
-            .args_json(json!({ "receiver_id": receiver_id, "amount": amount, "memo": memo }))
+        CallFtTransfer::call(&self.contract).args_json(
+            json!({ "receiver_id": receiver_id.as_ref(), "amount": amount, "memo": memo }),
+        )
     }
 
     pub fn ft_transfer_call(
         &self,
-        receiver_id: AccountId,
+        receiver_id: &impl AsRef<str>,
         amount: U128,
         memo: Option<String>,
         msg: String,
     ) -> CallFtTransferCall {
         CallFtTransferCall::call(&self.contract).args_json(json!({
-           "receiver_id": receiver_id,
+           "receiver_id": receiver_id.as_ref(),
            "amount": amount,
            "memo": memo,
            "msg": msg,
@@ -84,14 +84,14 @@ impl EthConnectorContract {
 
     pub fn engine_ft_transfer(
         &self,
-        sender_id: AccountId,
-        receiver_id: AccountId,
+        sender_id: &impl AsRef<str>,
+        receiver_id: &impl AsRef<str>,
         amount: U128,
         memo: Option<String>,
     ) -> CallEngineFtTransfer {
         CallEngineFtTransfer::call(&self.contract).args_json(json!({
-            "sender_id": sender_id,
-            "receiver_id": receiver_id,
+            "sender_id": sender_id.as_ref(),
+            "receiver_id": receiver_id.as_ref(),
             "amount": amount,
             "memo": memo
         }))
@@ -99,38 +99,42 @@ impl EthConnectorContract {
 
     pub fn engine_ft_transfer_call(
         &self,
-        sender_id: AccountId,
-        receiver_id: AccountId,
+        sender_id: &impl AsRef<str>,
+        receiver_id: &impl AsRef<str>,
         amount: U128,
         memo: Option<String>,
         msg: String,
     ) -> CallEngineFtTransferCall {
         CallEngineFtTransferCall::call(&self.contract).args_json(json!({
-            "sender_id": sender_id,
-            "receiver_id": receiver_id,
+            "sender_id": sender_id.as_ref(),
+            "receiver_id": receiver_id.as_ref(),
             "amount": amount,
             "memo": memo,
             "msg": msg,
         }))
     }
 
-    pub fn set_engine_account(&self, engine_account: &AccountId) -> CallSetEngineAccount {
+    pub fn set_engine_account(&self, engine_account: &impl AsRef<str>) -> CallSetEngineAccount {
         CallSetEngineAccount::call(&self.contract).args_json(json!({
-            "engine_account": engine_account,
+            "engine_account": engine_account.as_ref(),
         }))
     }
 
-    pub fn remove_engine_account(&self, engine_account: &AccountId) -> CallRemoveEngineAccount {
+    pub fn remove_engine_account(
+        &self,
+        engine_account: &impl AsRef<str>,
+    ) -> CallRemoveEngineAccount {
         CallRemoveEngineAccount::call(&self.contract).args_json(json!({
-            "engine_account": engine_account,
+            "engine_account": engine_account.as_ref(),
         }))
     }
 
     pub fn storage_deposit(
         &self,
-        account_id: Option<AccountId>,
+        account_id: Option<&impl AsRef<str>>,
         registration_only: Option<bool>,
     ) -> CallStorageDeposit {
+        let account_id = account_id.map(|a| a.as_ref());
         CallStorageDeposit::call(&self.contract)
             .args_json(json!({ "account_id": account_id, "registration_only": registration_only}))
     }
@@ -145,38 +149,39 @@ impl EthConnectorContract {
 
     pub fn engine_storage_deposit(
         &self,
-        sender_id: AccountId,
-        account_id: Option<AccountId>,
+        sender_id: &impl AsRef<str>,
+        account_id: Option<&impl AsRef<str>>,
         registration_only: Option<bool>,
     ) -> CallEngineStorageDeposit {
+        let account_id = account_id.map(|a| a.as_ref());
         CallEngineStorageDeposit::call(&self.contract)
-            .args_json(json!({ "sender_id":  sender_id, "account_id": account_id, "registration_only": registration_only}))
+            .args_json(json!({ "sender_id":  sender_id.as_ref(), "account_id": account_id, "registration_only": registration_only}))
     }
 
     pub fn engine_storage_withdraw(
         &self,
-        sender_id: AccountId,
+        sender_id: &impl AsRef<str>,
         amount: Option<U128>,
     ) -> CallEngineStorageWithdraw {
         CallEngineStorageWithdraw::call(&self.contract)
-            .args_json(json!({ "sender_id":  sender_id, "amount": amount }))
+            .args_json(json!({ "sender_id":  sender_id.as_ref(), "amount": amount }))
     }
 
     pub fn engine_storage_unregister(
         &self,
-        sender_id: AccountId,
+        sender_id: &impl AsRef<str>,
         force: Option<bool>,
     ) -> CallEngineStorageUnregister {
         CallEngineStorageUnregister::call(&self.contract)
-            .args_json(json!({ "sender_id":  sender_id, "force": force }))
+            .args_json(json!({ "sender_id":  sender_id.as_ref(), "force": force }))
     }
 
     pub fn set_paused_flags(&self, paused: PausedMask) -> CallSetPausedFlags {
         CallSetPausedFlags::call(&self.contract).args_borsh(paused)
     }
 
-    pub fn set_access_right(&self, account: AccountId) -> CallSetAccessRight {
-        CallSetAccessRight::call(&self.contract).args_json((account,))
+    pub fn set_access_right(&self, account: &impl AsRef<str>) -> CallSetAccessRight {
+        CallSetAccessRight::call(&self.contract).args_json((account.as_ref(),))
     }
 
     pub fn withdraw(&self, recipient_address: Address, amount: Balance) -> CallWithdraw {
@@ -185,11 +190,15 @@ impl EthConnectorContract {
 
     pub fn engine_withdraw(
         &self,
-        sender_id: AccountId,
+        sender_id: &impl AsRef<str>,
         recipient_address: Address,
         amount: Balance,
     ) -> CallEngineWithdraw {
-        CallEngineWithdraw::call(&self.contract).args_borsh((sender_id, recipient_address, amount))
+        CallEngineWithdraw::call(&self.contract).args_borsh((
+            sender_id.as_ref(),
+            recipient_address,
+            amount,
+        ))
     }
 
     pub fn deposit(&self, raw_proof: Proof) -> CallDeposit {
@@ -234,17 +243,21 @@ impl EthConnectorContract {
         ViewIsUsedProof::view(&self.contract).args_borsh(proof)
     }
 
-    pub fn storage_balance_of(&self, account_id: AccountId) -> ViewStorageBalanceOf {
-        ViewStorageBalanceOf::view(&self.contract).args_json(json!({ "account_id": account_id }))
+    pub fn storage_balance_of(&self, account_id: &impl AsRef<str>) -> ViewStorageBalanceOf {
+        ViewStorageBalanceOf::view(&self.contract)
+            .args_json(json!({ "account_id": account_id.as_ref() }))
     }
 
     pub fn storage_balance_bounds(&self) -> ViewStorageBalanceBounds {
         ViewStorageBalanceBounds::view(&self.contract)
     }
 
-    pub fn is_engine_account_exist(&self, engine_account: &AccountId) -> ViewIsEngineAccountExist {
+    pub fn is_engine_account_exist(
+        &self,
+        engine_account: &impl AsRef<str>,
+    ) -> ViewIsEngineAccountExist {
         ViewIsEngineAccountExist::view(&self.contract).args_json(json!({
-            "engine_account": engine_account,
+            "engine_account": engine_account.as_ref(),
         }))
     }
 
@@ -252,7 +265,7 @@ impl EthConnectorContract {
         ViewFtTotalSupply::view(&self.contract)
     }
 
-    pub fn ft_balance_of(&self, account_id: AccountId) -> ViewFtBalanceOf {
-        ViewFtBalanceOf::view(&self.contract).args_json(json!((account_id,)))
+    pub fn ft_balance_of(&self, account_id: &impl AsRef<str>) -> ViewFtBalanceOf {
+        ViewFtBalanceOf::view(&self.contract).args_json(json!((account_id.as_ref(),)))
     }
 }
diff --git a/eth-connector/tests/fungible_token_tests.rs b/eth-connector/tests/fungible_token_tests.rs
index 652e87d..d2407a9 100644
--- a/eth-connector/tests/fungible_token_tests.rs
+++ b/eth-connector/tests/fungible_token_tests.rs
@@ -35,11 +35,11 @@ async fn deploy_and_init() -> anyhow::Result<EthConnectorContract> {
 
     eth_contract
         .init(
-            prover_account,
+            &prover_account,
             eth_custodian_address,
             metadata,
             &account_with_access_right,
-            owner_id,
+            &owner_id,
         )
         .transact()
         .await?;
@@ -54,7 +54,7 @@ async fn test_ft_transfer() {
     let memo = Some(String::from("some message"));
 
     contract
-        .ft_transfer(some_acc, amount, memo)
+        .ft_transfer(&some_acc, amount, memo)
         .max_gas()
         .deposit(1)
         .transact()
@@ -71,7 +71,7 @@ async fn test_ft_transfer_call() {
     let msg = String::from("some msg");
 
     let res: PromiseOrValue<U128> = contract
-        .ft_transfer_call(some_acc, amount, memo, msg)
+        .ft_transfer_call(&some_acc, amount, memo, msg)
         .max_gas()
         .deposit(1)
         .transact()
@@ -102,7 +102,7 @@ async fn test_ft_balance_of() {
     let contract = deploy_and_init().await.unwrap();
     let account = contract.as_contract().id();
     let account_id = AccountId::from_str(account.as_str()).unwrap();
-    let res = contract.ft_balance_of(account_id).await.unwrap();
+    let res = contract.ft_balance_of(&account_id).await.unwrap();
     let expected = ViewResult {
         result: U128::from(200),
         logs: vec![],
@@ -154,7 +154,7 @@ async fn test_storage_deposit() {
     let contract = deploy_and_init().await.unwrap();
     let account_id = AccountId::from_str("test.near").unwrap();
     let res = contract
-        .storage_deposit(Some(account_id), Some(true))
+        .storage_deposit(Some(&account_id), Some(true))
         .max_gas()
         .transact()
         .await
@@ -199,7 +199,7 @@ async fn test_engine_storage_deposit() {
     let sender_id = AccountId::from_str("test.near").unwrap();
     let account_id = sender_id.clone();
     let res = contract
-        .engine_storage_deposit(sender_id, Some(account_id), Some(true))
+        .engine_storage_deposit(&sender_id, Some(&account_id), Some(true))
         .max_gas()
         .transact()
         .await
@@ -215,7 +215,7 @@ async fn test_engine_storage_withdraw() {
     let sender_id = AccountId::from_str("test.near").unwrap();
     let amount = Some(U128::from(100));
     let res = contract
-        .engine_storage_withdraw(sender_id, amount)
+        .engine_storage_withdraw(&sender_id, amount)
         .max_gas()
         .transact()
         .await
@@ -231,7 +231,7 @@ async fn test_engine_storage_unregister() {
     let sender_id = AccountId::from_str("test.near").unwrap();
     let force = Some(true);
     let res = contract
-        .engine_storage_unregister(sender_id, force)
+        .engine_storage_unregister(&sender_id, force)
         .max_gas()
         .transact()
         .await
@@ -244,7 +244,7 @@ async fn test_engine_storage_unregister() {
 async fn test_storage_balance_of() {
     let contract = deploy_and_init().await.unwrap();
     let account_id = AccountId::from_str("test.near").unwrap();
-    let res = contract.storage_balance_of(account_id).await.unwrap();
+    let res = contract.storage_balance_of(&account_id).await.unwrap();
     let result = res.result;
     assert_eq!(result.total, U128::from(10));
     assert_eq!(result.available, U128::from(20));
@@ -274,7 +274,7 @@ async fn test_set_access_right() {
     let contract = deploy_and_init().await.unwrap();
     let account = AccountId::from_str("test.near").unwrap();
     contract
-        .set_access_right(account)
+        .set_access_right(&account)
         .max_gas()
         .transact()
         .await
@@ -306,7 +306,7 @@ async fn test_engine_withdraw() {
     let sender_id = AccountId::from_str("test.near").unwrap();
     let recipient_address = Address::zero();
     let res = contract
-        .engine_withdraw(sender_id, recipient_address, 10)
+        .engine_withdraw(&sender_id, recipient_address, 10)
         .max_gas()
         .transact()
         .await