diff --git a/ethexe/rpc/src/apis/injected/promise_manager.rs b/ethexe/rpc/src/apis/injected/promise_manager.rs
index d55f454eef7..f8b9401a2f7 100644
--- a/ethexe/rpc/src/apis/injected/promise_manager.rs
+++ b/ethexe/rpc/src/apis/injected/promise_manager.rs
@@ -26,6 +26,7 @@ use ethexe_common::{
     },
 };
 use ethexe_db::Database;
+use serde::{Deserialize, Serialize};
 use std::{sync::Arc, time::Duration};
 use tokio::sync::oneshot;
 use tracing::trace;
@@ -45,7 +46,7 @@ pub struct PromiseSubscriptionManager {
     waiting_for_compute: PromisesComputationWaiting,
 }
 
-#[derive(Debug, Clone, thiserror::Error)]
+#[derive(Debug, Clone, thiserror::Error, Serialize, Deserialize)]
 pub enum RegisterSubscriberError {
     #[error("Subscriber for this transaction already exists, tx_hash={0}")]
     AlreadyRegistered(HashOf<InjectedTransaction>),
diff --git a/ethexe/rpc/src/apis/injected/relay.rs b/ethexe/rpc/src/apis/injected/relay.rs
index 5a52fa8d2a6..b9f8d9fb3b0 100644
--- a/ethexe/rpc/src/apis/injected/relay.rs
+++ b/ethexe/rpc/src/apis/injected/relay.rs
@@ -51,7 +51,7 @@ impl TransactionsRelayer {
                 value = transaction.tx.data().value,
                 "Injected transaction with non-zero value is not supported"
             );
-            return Err(errors::bad_request(
+            return Err(errors::invalid_params_with(
                 "Injected transactions with non-zero value are not supported",
             ));
         }
diff --git a/ethexe/rpc/src/apis/injected/server.rs b/ethexe/rpc/src/apis/injected/server.rs
index 117aed18e57..3c8ced2c12b 100644
--- a/ethexe/rpc/src/apis/injected/server.rs
+++ b/ethexe/rpc/src/apis/injected/server.rs
@@ -118,7 +118,7 @@ impl InjectedApi {
         let pending_subscriber = match self.manager.try_register_subscriber(tx_hash) {
             Ok(subscriber) => subscriber,
             Err(err) => {
-                return Err(errors::bad_request(err).into());
+                return Err(errors::bad_request(Some(err)).into());
             }
         };
 
@@ -181,7 +181,7 @@ impl InjectedApi {
         tracing::trace!(?transaction_ids, "Called injected_getTransactions");
 
         if transaction_ids.len() > MAX_TRANSACTION_IDS {
-            return Err(errors::invalid_params(format!(
+            return Err(errors::invalid_params_with(format!(
                 "Too many transaction ids requested. Maximum is {MAX_TRANSACTION_IDS}.",
             )));
         }
diff --git a/ethexe/rpc/src/errors.rs b/ethexe/rpc/src/errors.rs
index 73c7f4cae00..3f9c56c6ddf 100644
--- a/ethexe/rpc/src/errors.rs
+++ b/ethexe/rpc/src/errors.rs
@@ -16,26 +16,41 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
-use jsonrpsee::types::{ErrorObject, error::INVALID_PARAMS_CODE};
-
-// TODO #4364: https://github.com/gear-tech/gear/issues/4364
+use jsonrpsee::types::{
+    ErrorObject,
+    error::{
+        CALL_EXECUTION_FAILED_CODE, INTERNAL_ERROR_CODE, INTERNAL_ERROR_MSG, INVALID_PARAMS_CODE,
+        INVALID_PARAMS_MSG, INVALID_REQUEST_CODE, INVALID_REQUEST_MSG,
+    },
+};
+use serde::Serialize;
 
+// TODO: db errors are cause when we do not found some data in data, so maybe rename it to `not_found`.
 pub fn db(err: &'static str) -> ErrorObject<'static> {
     ErrorObject::owned(8000, "Database error", Some(err))
 }
 
 pub fn runtime(err: impl ToString) -> ErrorObject<'static> {
-    ErrorObject::owned(8000, "Runtime error", Some(err.to_string()))
+    ErrorObject::owned(
+        CALL_EXECUTION_FAILED_CODE,
+        "Runtime error",
+        Some(err.to_string()),
+    )
 }
 
-pub fn bad_request(err: impl ToString) -> ErrorObject<'static> {
-    ErrorObject::owned(8000, "Bad request", Some(err.to_string()))
+pub fn bad_request<D: Serialize>(data: Option<D>) -> ErrorObject<'static> {
+    ErrorObject::owned(INVALID_REQUEST_CODE, INVALID_REQUEST_MSG, data)
 }
 
 pub fn internal() -> ErrorObject<'static> {
-    ErrorObject::owned(8000, "Internal error", None::<&str>)
+    ErrorObject::owned(INTERNAL_ERROR_CODE, INTERNAL_ERROR_MSG, None::<&str>)
+}
+
+#[allow(unused)]
+pub fn invalid_params() -> ErrorObject<'static> {
+    ErrorObject::owned(INVALID_PARAMS_CODE, INVALID_PARAMS_MSG, None::<&str>)
 }
 
-pub fn invalid_params(err: impl ToString) -> ErrorObject<'static> {
-    ErrorObject::owned(INVALID_PARAMS_CODE, "Invalid params", Some(err.to_string()))
+pub fn invalid_params_with<D: Serialize>(data: D) -> ErrorObject<'static> {
+    ErrorObject::owned(INVALID_PARAMS_CODE, INVALID_PARAMS_MSG, Some(data))
 }