diff --git a/Cargo.lock b/Cargo.lock
index 847f3a4c48..df5cbdb878 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -10081,6 +10081,7 @@ dependencies = [
  "indexmap 2.6.0",
  "itertools 0.12.1",
  "num-bigint 0.4.6",
+ "num-traits 0.2.19",
  "pretty_assertions",
  "primitive-types",
  "rstest",
diff --git a/crates/blockifier/src/abi/abi_utils_test.rs b/crates/blockifier/src/abi/abi_utils_test.rs
index 7c3ad40eca..278237ccce 100644
--- a/crates/blockifier/src/abi/abi_utils_test.rs
+++ b/crates/blockifier/src/abi/abi_utils_test.rs
@@ -1,11 +1,8 @@
-use num_bigint::BigUint;
 use starknet_api::core::EntryPointSelector;
 use starknet_api::felt;
-use starknet_types_core::felt::Felt;
 
 use crate::abi::abi_utils::selector_from_name;
 use crate::abi::constants as abi_constants;
-use crate::abi::sierra_types::felt_to_u128;
 use crate::transaction::constants as tx_constants;
 
 #[test]
@@ -37,20 +34,3 @@ fn test_selector_from_name() {
     let expected_empty_selector = EntryPointSelector(felt!(expected_empty_selector));
     assert_eq!(selector_from_name(""), expected_empty_selector);
 }
-
-#[test]
-fn test_value_too_large_for_type() {
-    // Happy flow.
-    let n = 1991_u128;
-    let n_as_felt = Felt::from(n);
-    felt_to_u128(&n_as_felt).unwrap();
-
-    // Value too large for type.
-    let overflowed_u128: BigUint = BigUint::from(1_u8) << 128;
-    let overflowed_u128_as_felt = Felt::from(overflowed_u128);
-    let error = felt_to_u128(&overflowed_u128_as_felt).unwrap_err();
-    assert_eq!(
-        format!("{error}"),
-        "Felt 340282366920938463463374607431768211456 is too big to convert to 'u128'."
-    );
-}
diff --git a/crates/blockifier/src/abi/sierra_types.rs b/crates/blockifier/src/abi/sierra_types.rs
index 58677f36fc..620fdd97a9 100644
--- a/crates/blockifier/src/abi/sierra_types.rs
+++ b/crates/blockifier/src/abi/sierra_types.rs
@@ -3,11 +3,9 @@ use cairo_vm::types::relocatable::Relocatable;
 use cairo_vm::vm::errors::memory_errors::MemoryError;
 use cairo_vm::vm::vm_core::VirtualMachine;
 use num_bigint::{BigUint, ToBigUint};
-use num_traits::ToPrimitive;
-use starknet_api::core::ContractAddress;
+use starknet_api::core::{felt_to_u128, ContractAddress};
 use starknet_api::state::StorageKey;
 use starknet_api::StarknetApiError;
-use starknet_types_core::felt::Felt;
 use thiserror::Error;
 
 use crate::state::errors::StateError;
@@ -17,8 +15,6 @@ pub type SierraTypeResult<T> = Result<T, SierraTypeError>;
 
 #[derive(Debug, Error)]
 pub enum SierraTypeError {
-    #[error("Felt {val} is too big to convert to '{ty}'.")]
-    ValueTooLargeForType { val: Felt, ty: &'static str },
     #[error(transparent)]
     MemoryError(#[from] MemoryError),
     #[error(transparent)]
@@ -39,12 +35,6 @@ pub trait SierraType: Sized {
     ) -> SierraTypeResult<Self>;
 }
 
-// Utils.
-
-pub fn felt_to_u128(felt: &Felt) -> Result<u128, SierraTypeError> {
-    felt.to_u128().ok_or_else(|| SierraTypeError::ValueTooLargeForType { val: *felt, ty: "u128" })
-}
-
 // Implementations.
 
 // We implement the trait SierraType for SierraU128 and not for u128 since it's not guaranteed that
diff --git a/crates/starknet_api/Cargo.toml b/crates/starknet_api/Cargo.toml
index 73879008b9..beb50e9ca5 100644
--- a/crates/starknet_api/Cargo.toml
+++ b/crates/starknet_api/Cargo.toml
@@ -18,6 +18,7 @@ hex.workspace = true
 indexmap = { workspace = true, features = ["serde"] }
 itertools.workspace = true
 num-bigint.workspace = true
+num-traits.workspace = true
 pretty_assertions.workspace = true
 primitive-types = { workspace = true, features = ["serde"] }
 serde = { workspace = true, features = ["derive", "rc"] }
diff --git a/crates/starknet_api/src/core.rs b/crates/starknet_api/src/core.rs
index ec2ac3ed8e..d41ebc600f 100644
--- a/crates/starknet_api/src/core.rs
+++ b/crates/starknet_api/src/core.rs
@@ -5,6 +5,7 @@ mod core_test;
 use std::fmt::Debug;
 use std::sync::LazyLock;
 
+use num_traits::ToPrimitive;
 use primitive_types::H160;
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use starknet_types_core::felt::{Felt, NonZeroFelt};
@@ -18,8 +19,15 @@ use crate::{impl_from_through_intermediate, StarknetApiError};
 
 /// Felt.
 pub fn ascii_as_felt(ascii_str: &str) -> Result<Felt, StarknetApiError> {
-    Felt::from_hex(hex::encode(ascii_str).as_str())
-        .map_err(|_| StarknetApiError::OutOfRange { string: ascii_str.to_string() })
+    Felt::from_hex(hex::encode(ascii_str).as_str()).map_err(|_| StarknetApiError::OutOfRange {
+        string: format!("The str {}, does not fit into a single felt", ascii_str),
+    })
+}
+
+pub fn felt_to_u128(felt: &Felt) -> Result<u128, StarknetApiError> {
+    felt.to_u128().ok_or(StarknetApiError::OutOfRange {
+        string: format!("Felt {} is too big to convert to 'u128'", *felt,),
+    })
 }
 
 /// A chain id.
diff --git a/crates/starknet_api/src/core_test.rs b/crates/starknet_api/src/core_test.rs
index 81221cce44..0443f9ffb4 100644
--- a/crates/starknet_api/src/core_test.rs
+++ b/crates/starknet_api/src/core_test.rs
@@ -1,10 +1,12 @@
 use assert_matches::assert_matches;
+use num_bigint::BigUint;
 use starknet_types_core::felt::Felt;
 use starknet_types_core::hash::{Pedersen, StarkHash as CoreStarkHash};
 
 use crate::core::{
     ascii_as_felt,
     calculate_contract_address,
+    felt_to_u128,
     ChainId,
     ContractAddress,
     EthAddress,
@@ -111,3 +113,21 @@ fn test_ascii_as_felt() {
     let expected_sn_main = Felt::from(23448594291968334_u128);
     assert_eq!(sn_main_felt, expected_sn_main);
 }
+
+#[test]
+fn test_value_too_large_for_type() {
+    // Happy flow.
+    let n = 1991_u128;
+    let n_as_felt = Felt::from(n);
+    felt_to_u128(&n_as_felt).unwrap();
+
+    // Value too large for type.
+    let overflowed_u128: BigUint = BigUint::from(1_u8) << 128;
+    let overflowed_u128_as_felt = Felt::from(overflowed_u128);
+    let error = felt_to_u128(&overflowed_u128_as_felt).unwrap_err();
+    assert_eq!(
+        format!("{error}"),
+        "Out of range Felt 340282366920938463463374607431768211456 is too big to convert to \
+         'u128'."
+    );
+}