diff --git a/runner/src/vec252.rs b/runner/src/vec252.rs
new file mode 100644
index 000000000..33444d891
--- /dev/null
+++ b/runner/src/vec252.rs
@@ -0,0 +1,118 @@
+use std::{ops::Deref, str::FromStr};
+
+use cairo_felt::Felt252;
+use serde::{de::Visitor, Deserialize};
+use serde_json::Value;
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum VecFelt252Error {
+    #[error("failed to parse number: {0}")]
+    NumberParseError(#[from] std::num::ParseIntError),
+    #[error("failed to parse bigint: {0}")]
+    BigIntParseError(#[from] num_bigint::ParseBigIntError),
+    #[error("number out of range")]
+    NumberOutOfRange,
+}
+
+/// `VecFelt252` is a wrapper around a vector of `Arg`.
+///
+/// It provides convenience methods for working with a vector of `Arg` and implements
+/// `Deref` to allow it to be treated like a vector of `Arg`.
+#[derive(Debug, Clone)]
+pub struct VecFelt252(Vec<Felt252>);
+
+impl VecFelt252 {
+    /// Creates a new `VecFelt252` from a vector of `Arg`.
+    ///
+    /// # Arguments
+    ///
+    /// * `args` - A vector of `Arg`.
+    ///
+    /// # Returns
+    ///
+    /// * `VecFelt252` - A new `VecFelt252` instance.
+    #[must_use]
+    pub fn new(args: Vec<Felt252>) -> Self {
+        Self(args)
+    }
+}
+
+impl Deref for VecFelt252 {
+    type Target = Vec<Felt252>;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl From<VecFelt252> for Vec<Felt252> {
+    fn from(args: VecFelt252) -> Self {
+        args.0
+    }
+}
+
+impl From<Vec<Felt252>> for VecFelt252 {
+    fn from(args: Vec<Felt252>) -> Self {
+        Self(args)
+    }
+}
+
+impl VecFelt252 {
+    fn visit_seq_helper(seq: &[Value]) -> Result<Self, VecFelt252Error> {
+        let iterator = seq.iter();
+        let mut args = Vec::new();
+
+        for arg in iterator {
+            match arg {
+                Value::Number(n) => {
+                    let n = n.as_u64().ok_or(VecFelt252Error::NumberOutOfRange)?;
+                    args.push(Felt252::from(n));
+                }
+                Value::String(n) => {
+                    let n = num_bigint::BigUint::from_str(n)?;
+                    args.push(Felt252::from_bytes_be(&n.to_bytes_be()));
+                }
+                Value::Array(a) => {
+                    args.push(Felt252::from(a.len()));
+                    let result = Self::visit_seq_helper(a)?;
+                    args.extend(result.0);
+                }
+                _ => (),
+            }
+        }
+
+        Ok(Self::new(args))
+    }
+}
+
+impl<'de> Visitor<'de> for VecFelt252 {
+    type Value = VecFelt252;
+    fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+        formatter.write_str("a list of arguments")
+    }
+    fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+    where
+        A: serde::de::SeqAccess<'de>,
+    {
+        let mut args = Vec::new();
+        while let Some(arg) = seq.next_element()? {
+            match arg {
+                Value::Number(n) => args.push(Value::Number(n)),
+                Value::String(n) => args.push(Value::String(n)),
+                Value::Array(a) => args.push(Value::Array(a)),
+                _ => return Err(serde::de::Error::custom("Invalid type")),
+            }
+        }
+
+        Self::visit_seq_helper(&args).map_err(|e| serde::de::Error::custom(e.to_string()))
+    }
+}
+
+impl<'de> Deserialize<'de> for VecFelt252 {
+    fn deserialize<D>(deserializer: D) -> Result<VecFelt252, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        deserializer.deserialize_seq(VecFelt252(Vec::new()))
+    }
+}