diff --git a/crates/gateway/src/errors.rs b/crates/gateway/src/errors.rs
index 24d5ef74..75c30c0d 100644
--- a/crates/gateway/src/errors.rs
+++ b/crates/gateway/src/errors.rs
@@ -88,6 +88,8 @@ pub enum StatelessTransactionValidatorError {
         contract_class_object_size: usize,
         max_contract_class_object_size: usize,
     },
+    #[error("Entry points must be unique and sorted.")]
+    EntryPointsNotUniquelySorted,
 }
 
 pub type StatelessTransactionValidatorResult<T> = Result<T, StatelessTransactionValidatorError>;
diff --git a/crates/gateway/src/stateless_transaction_validator.rs b/crates/gateway/src/stateless_transaction_validator.rs
index c66282c0..70805ab5 100644
--- a/crates/gateway/src/stateless_transaction_validator.rs
+++ b/crates/gateway/src/stateless_transaction_validator.rs
@@ -2,6 +2,7 @@ use starknet_api::rpc_transaction::{
     RPCDeclareTransaction, RPCDeployAccountTransaction, RPCInvokeTransaction, RPCTransaction,
     ResourceBoundsMapping,
 };
+use starknet_api::state::EntryPoint;
 use starknet_api::transaction::Resource;
 use starknet_types_core::felt::Felt;
 
@@ -106,7 +107,9 @@ impl StatelessTransactionValidator {
             RPCDeclareTransaction::V3(tx) => &tx.contract_class,
         };
         self.validate_sierra_version(&contract_class.sierra_program)?;
-        self.validate_class_length(contract_class)
+        self.validate_class_length(contract_class)?;
+        self.validate_entry_points_sorted_and_unique(contract_class)?;
+        Ok(())
     }
 
     fn validate_sierra_version(
@@ -154,6 +157,24 @@ impl StatelessTransactionValidator {
 
         Ok(())
     }
+
+    fn validate_entry_points_sorted_and_unique(
+        &self,
+        contract_class: &starknet_api::rpc_transaction::ContractClass,
+    ) -> StatelessTransactionValidatorResult<()> {
+        let is_sorted_unique = |entry_points: &[EntryPoint]| {
+            entry_points.windows(2).all(|pair| pair[0].selector < pair[1].selector)
+        };
+
+        if is_sorted_unique(&contract_class.entry_points_by_type.constructor)
+            && is_sorted_unique(&contract_class.entry_points_by_type.external)
+            && is_sorted_unique(&contract_class.entry_points_by_type.l1handler)
+        {
+            return Ok(());
+        }
+
+        Err(StatelessTransactionValidatorError::EntryPointsNotUniquelySorted)
+    }
 }
 
 fn validate_resource_is_non_zero(
diff --git a/crates/gateway/src/stateless_transaction_validator_test.rs b/crates/gateway/src/stateless_transaction_validator_test.rs
index dd2109c9..0d14f632 100644
--- a/crates/gateway/src/stateless_transaction_validator_test.rs
+++ b/crates/gateway/src/stateless_transaction_validator_test.rs
@@ -1,3 +1,5 @@
+use std::vec;
+
 use assert_matches::assert_matches;
 use mempool_test_utils::declare_tx_args;
 use mempool_test_utils::starknet_api_test_utils::{
@@ -5,13 +7,16 @@ use mempool_test_utils::starknet_api_test_utils::{
     zero_resource_bounds_mapping, TransactionType, NON_EMPTY_RESOURCE_BOUNDS,
 };
 use rstest::rstest;
-use starknet_api::rpc_transaction::{ContractClass, ResourceBoundsMapping};
+use starknet_api::core::EntryPointSelector;
+use starknet_api::rpc_transaction::{ContractClass, EntryPointByType, ResourceBoundsMapping};
+use starknet_api::state::EntryPoint;
 use starknet_api::transaction::{Calldata, Resource, ResourceBounds, TransactionSignature};
 use starknet_api::{calldata, felt};
 use starknet_types_core::felt::Felt;
 
 use crate::compiler_version::{VersionId, VersionIdError};
 use crate::config::StatelessTransactionValidatorConfig;
+use crate::errors::StatelessTransactionValidatorResult;
 use crate::stateless_transaction_validator::{
     StatelessTransactionValidator, StatelessTransactionValidatorError,
 };
@@ -326,3 +331,90 @@ fn test_declare_contract_class_size_too_long() {
         ) == (contract_class_length, config_max_raw_class_size)
     )
 }
+
+#[rstest]
+#[case::valid(
+    vec![
+        EntryPoint { selector: EntryPointSelector(felt!(1_u128)), ..Default::default() },
+        EntryPoint { selector: EntryPointSelector(felt!(2_u128)), ..Default::default() }
+    ],
+    Ok(())
+)]
+#[case::no_entry_points(
+    vec![],
+    Ok(())
+)]
+#[case::single_entry_point(
+    vec![
+        EntryPoint { selector: EntryPointSelector(felt!(1_u128)), ..Default::default() }
+    ],
+    Ok(())
+)]
+#[case::not_sorted(
+    vec![
+        EntryPoint { selector: EntryPointSelector(felt!(2_u128)), ..Default::default() },
+        EntryPoint { selector: EntryPointSelector(felt!(1_u128)), ..Default::default() },
+    ],
+    Err(StatelessTransactionValidatorError::EntryPointsNotUniquelySorted)
+)]
+#[case::not_unique(
+    vec![
+        EntryPoint { selector: EntryPointSelector(felt!(1_u128)), ..Default::default() },
+        EntryPoint { selector: EntryPointSelector(felt!(1_u128)), ..Default::default() },
+    ],
+    Err(StatelessTransactionValidatorError::EntryPointsNotUniquelySorted)
+)]
+#[case::many_entry_points(
+    vec![
+        EntryPoint { selector: EntryPointSelector(felt!(1_u128)), ..Default::default() },
+        EntryPoint { selector: EntryPointSelector(felt!(2_u128)), ..Default::default() },
+        EntryPoint { selector: EntryPointSelector(felt!(1_u128)), ..Default::default() },
+    ],
+    Err(StatelessTransactionValidatorError::EntryPointsNotUniquelySorted)
+)]
+fn test_declare_entry_points_not_sorted_by_selector(
+    #[case] entry_points: Vec<EntryPoint>,
+    #[case] expected: StatelessTransactionValidatorResult<()>,
+) {
+    let tx_validator =
+        StatelessTransactionValidator { config: DEFAULT_VALIDATOR_CONFIG_FOR_TESTING };
+
+    let contract_class = ContractClass {
+        sierra_program: vec![felt!(1_u128); 3],
+        entry_points_by_type: EntryPointByType {
+            constructor: entry_points.clone(),
+            external: vec![],
+            l1handler: vec![],
+        },
+        ..Default::default()
+    };
+    let tx = external_declare_tx(declare_tx_args!(contract_class));
+
+    assert_eq!(tx_validator.validate(&tx), expected);
+
+    let contract_class = ContractClass {
+        sierra_program: vec![felt!(1_u128); 3],
+        entry_points_by_type: EntryPointByType {
+            constructor: vec![],
+            external: entry_points.clone(),
+            l1handler: vec![],
+        },
+        ..Default::default()
+    };
+    let tx = external_declare_tx(declare_tx_args!(contract_class));
+
+    assert_eq!(tx_validator.validate(&tx), expected);
+
+    let contract_class = ContractClass {
+        sierra_program: vec![felt!(1_u128); 3],
+        entry_points_by_type: EntryPointByType {
+            constructor: vec![],
+            external: vec![],
+            l1handler: entry_points,
+        },
+        ..Default::default()
+    };
+    let tx = external_declare_tx(declare_tx_args!(contract_class));
+
+    assert_eq!(tx_validator.validate(&tx), expected);
+}