diff --git a/src/cli/call.rs b/src/cli/call.rs
index e4edc27..a583513 100644
--- a/src/cli/call.rs
+++ b/src/cli/call.rs
@@ -1,5 +1,5 @@
 use super::trace::{self, TraceError, TraceOpts};
-use crate::utils::value_parser;
+use crate::utils::{hex_utils, value_parser};
 use clap::Parser;
 use serde_json::json;
 
@@ -143,8 +143,8 @@ pub fn run(args: CallArgs) -> Result<(), TraceError> {
 fn parse_block_id(block: &str) -> Result<String, TraceError> {
     match block {
         "latest" | "earliest" | "pending" | "safe" | "finalized" => Ok(block.to_string()),
-        s if s.starts_with("0x") || s.starts_with("0X") => {
-            let hex = &s[2..];
+        s if hex_utils::require_0x(s).is_some() => {
+            let hex = hex_utils::require_0x(s).unwrap();
             if hex.is_empty() || !hex.chars().all(|c| c.is_ascii_hexdigit()) {
                 return Err(TraceError::InvalidInput(format!(
                     "--block: invalid hex block number '{s}'"
diff --git a/src/cli/clean.rs b/src/cli/clean.rs
index 6bee798..9bdec67 100644
--- a/src/cli/clean.rs
+++ b/src/cli/clean.rs
@@ -1,6 +1,7 @@
 use crate::utils::disk_cache::{CacheError, DiskCache};
 use clap::Parser;
 use std::fs;
+use std::path::Path;
 use thiserror::Error;
 
 const CACHE_KINDS: &[&str] = &["selectors", "contracts"];
@@ -48,7 +49,7 @@ pub fn run(args: CleanArgs) -> Result<(), CleanError> {
     }
 
     if !found_any {
-        match DiskCache::cache_path(CACHE_KINDS[0]).and_then(|p| p.parent().map(|d| d.to_owned())) {
+        match DiskCache::cache_path(CACHE_KINDS[0]).and_then(|p| p.parent().map(Path::to_owned)) {
             Some(dir) => println!("no cache files found in {}", dir.display()),
             None => println!("no cache files found (could not determine cache directory)"),
         }
diff --git a/src/cli/trace.rs b/src/cli/trace.rs
index f49195a..f479b20 100644
--- a/src/cli/trace.rs
+++ b/src/cli/trace.rs
@@ -144,8 +144,7 @@ fn resolve_rpc_url(url_or_alias: Option<String>) -> Result<String, TraceError> {
 
 /// Validate that a string is a 0x-prefixed Ethereum address (40 hex chars).
 pub fn validate_address(addr: &str, field: &str) -> Result<(), TraceError> {
-    let hex = addr
-        .strip_prefix("0x")
+    let hex = hex_utils::require_0x(addr)
         .ok_or_else(|| TraceError::InvalidInput(format!("{field}: missing 0x prefix")))?;
     if hex.len() != 40 {
         return Err(TraceError::InvalidInput(format!(
@@ -163,8 +162,7 @@ pub fn validate_address(addr: &str, field: &str) -> Result<(), TraceError> {
 
 /// Validate that a string is 0x-prefixed hex data with an even number of hex chars.
 pub fn validate_hex(data: &str, field: &str) -> Result<(), TraceError> {
-    let hex = data
-        .strip_prefix("0x")
+    let hex = hex_utils::require_0x(data)
         .ok_or_else(|| TraceError::InvalidInput(format!("{field}: missing 0x prefix")))?;
     if !hex.chars().all(|c| c.is_ascii_hexdigit()) {
         return Err(TraceError::InvalidInput(format!(
@@ -206,9 +204,7 @@ fn fetch_chain_id(client: &Client, rpc_url: &str) -> Result<String, TraceError>
 
 /// Parse a hex chain ID (e.g. `"0x1"`, `"0xa"`) into a decimal string.
 fn parse_chain_id_hex(hex_str: &str) -> Result<String, TraceError> {
-    let stripped = hex_str
-        .strip_prefix("0x")
-        .or_else(|| hex_str.strip_prefix("0X"))
+    let stripped = hex_utils::require_0x(hex_str)
         .ok_or_else(|| TraceError::Decode(format!("eth_chainId: invalid hex '{hex_str}'")))?;
 
     u64::from_str_radix(stripped, 16)
@@ -477,7 +473,7 @@ fn print_call(
         }
     } else if decode_attempted {
         if let Some(input) = &node.input {
-            let s = input.strip_prefix("0x").unwrap_or(input);
+            let s = hex_utils::strip_0x(input);
             if s.len() > 8 {
                 println!(
                     "{meta_prefix}{}",
@@ -547,7 +543,7 @@ fn format_call_desc(
 }
 
 fn extract_selector(input: &str) -> Option<String> {
-    let s = input.strip_prefix("0x").unwrap_or(input);
+    let s = hex_utils::strip_0x(input);
     s.get(..8).map(|sel| format!("0x{sel}"))
 }
 
@@ -627,6 +623,16 @@ mod tests {
         assert!(validate_hex("0xab", "data").is_ok());
     }
 
+    #[test]
+    fn test_validate_address_uppercase_prefix() {
+        assert!(validate_address("0XdAC17F958D2ee523a2206206994597C13D831ec7", "to").is_ok());
+    }
+
+    #[test]
+    fn test_validate_hex_uppercase_prefix() {
+        assert!(validate_hex("0Xa9059cbb", "data").is_ok());
+    }
+
     #[test]
     fn test_parse_chain_id_hex() {
         assert_eq!(parse_chain_id_hex("0x1").unwrap(), "1");
diff --git a/src/utils/abi_decoder.rs b/src/utils/abi_decoder.rs
index 6570d63..386cb4c 100644
--- a/src/utils/abi_decoder.rs
+++ b/src/utils/abi_decoder.rs
@@ -1,3 +1,4 @@
+use super::hex_utils;
 use alloy_dyn_abi::{DynSolType, DynSolValue, JsonAbiExt};
 use alloy_json_abi::Function;
 
@@ -31,7 +32,7 @@ pub fn can_decode(signature: &str, calldata: &str) -> bool {
 /// Recognises `Error(string)` (0x08c379a0) and `Panic(uint256)` (0x4e487b71).
 /// Returns `None` for unknown selectors — use [`decode_custom_revert`] as fallback.
 pub fn decode_revert_reason(output: &str) -> Option<String> {
-    let hex = output.strip_prefix("0x").unwrap_or(output);
+    let hex = hex_utils::strip_0x(output);
     if hex.len() < 8 {
         return None;
     }
@@ -66,7 +67,7 @@ pub fn decode_custom_revert(
     output: &str,
     resolver: &mut super::selector_resolver::SelectorResolver,
 ) -> Option<String> {
-    let hex = output.strip_prefix("0x").unwrap_or(output);
+    let hex = hex_utils::strip_0x(output);
     if hex.len() < 8 {
         return None;
     }
@@ -110,7 +111,7 @@ pub fn format_value(value: &DynSolValue) -> String {
 }
 
 fn decode_hex(input: &str) -> Option<Vec<u8>> {
-    hex::decode(input.strip_prefix("0x").unwrap_or(input)).ok()
+    hex::decode(hex_utils::strip_0x(input)).ok()
 }
 
 fn decode_with_function(signature: &str, data: &[u8]) -> Option<Vec<(DynSolType, DynSolValue)>> {
diff --git a/src/utils/event_formatter.rs b/src/utils/event_formatter.rs
index 5190f8a..b3c6a37 100644
--- a/src/utils/event_formatter.rs
+++ b/src/utils/event_formatter.rs
@@ -72,7 +72,7 @@ fn format_event_raw(topic0: &str, log: &Log) -> String {
     }
 
     if let Some(data) = &log.data {
-        let stripped = data.strip_prefix("0x").unwrap_or(data);
+        let stripped = hex_utils::strip_0x(data);
         if !stripped.is_empty() {
             parts.push(format!("data: {data}"));
         }
@@ -107,7 +107,7 @@ fn decode_event_params(signature: &str, log: &Log) -> Vec<String> {
 }
 
 fn decode_event_data(signature: &str, data: &str, indexed_count: usize) -> Option<Vec<String>> {
-    let stripped = data.strip_prefix("0x").unwrap_or(data);
+    let stripped = hex_utils::strip_0x(data);
     if stripped.is_empty() {
         return Some(Vec::new());
     }
@@ -183,7 +183,7 @@ fn format_decoded_values(value: &alloy_dyn_abi::DynSolValue) -> Vec<String> {
 /// Tries to parse as number (must fit in u128 as a heuristic to distinguish
 /// numbers from hashes), then detects addresses; otherwise shows full hex.
 fn format_topic_value(topic: &str) -> String {
-    let stripped = topic.strip_prefix("0x").unwrap_or(topic);
+    let stripped = hex_utils::strip_0x(topic);
 
     // Heuristic: if the value fits in u128, it's likely a number.
     // Full 32-byte values (hashes, large IDs) won't fit.
diff --git a/src/utils/hex_utils.rs b/src/utils/hex_utils.rs
index aaf69ce..6d222ce 100644
--- a/src/utils/hex_utils.rs
+++ b/src/utils/hex_utils.rs
@@ -1,8 +1,17 @@
 use alloy_primitives::U256;
 
-/// Parse a hex string (with or without 0x prefix) as U256.
+pub fn strip_0x(s: &str) -> &str {
+    s.strip_prefix("0x")
+        .or_else(|| s.strip_prefix("0X"))
+        .unwrap_or(s)
+}
+
+pub fn require_0x(s: &str) -> Option<&str> {
+    s.strip_prefix("0x").or_else(|| s.strip_prefix("0X"))
+}
+
 pub fn parse_hex_u256(s: &str) -> Option<U256> {
-    let s = s.strip_prefix("0x").unwrap_or(s);
+    let s = strip_0x(s);
     U256::from_str_radix(s, 16).ok()
 }
 
@@ -10,6 +19,23 @@ pub fn parse_hex_u256(s: &str) -> Option<U256> {
 mod tests {
     use super::*;
 
+    #[test]
+    fn test_strip_0x() {
+        assert_eq!(strip_0x("0xabc"), "abc");
+        assert_eq!(strip_0x("0Xabc"), "abc");
+        assert_eq!(strip_0x("abc"), "abc");
+        assert_eq!(strip_0x("0x"), "");
+        assert_eq!(strip_0x("0X"), "");
+    }
+
+    #[test]
+    fn test_require_0x() {
+        assert_eq!(require_0x("0xabc"), Some("abc"));
+        assert_eq!(require_0x("0Xabc"), Some("abc"));
+        assert_eq!(require_0x("abc"), None);
+        assert_eq!(require_0x("0x"), Some(""));
+    }
+
     #[test]
     fn test_parse_hex_u256() {
         assert_eq!(parse_hex_u256("0x10"), Some(U256::from(16)));
diff --git a/src/utils/precompiles.rs b/src/utils/precompiles.rs
index 4f3f818..6162285 100644
--- a/src/utils/precompiles.rs
+++ b/src/utils/precompiles.rs
@@ -3,7 +3,7 @@
 /// Precompiled contracts are at addresses 0x01-0x0a (and potentially higher in newer forks).
 /// Returns `Some((name, signature))` if the address is a known precompile, `None` otherwise.
 pub fn get_precompile_info(address: &str) -> Option<(&'static str, &'static str)> {
-    let addr = address.strip_prefix("0x").unwrap_or(address);
+    let addr = super::hex_utils::strip_0x(address);
 
     // Full 40-char addresses: precompiles have 38+ leading zeros.
     // Short-circuit: if the non-zero portion is beyond 0x0a, it's not a precompile.
diff --git a/src/utils/value_parser.rs b/src/utils/value_parser.rs
index 03e1977..cebf329 100644
--- a/src/utils/value_parser.rs
+++ b/src/utils/value_parser.rs
@@ -1,3 +1,4 @@
+use super::hex_utils;
 use alloy_primitives::U256;
 
 /// Parse a value string into a `0x`-prefixed hex wei amount.
@@ -9,7 +10,7 @@ use alloy_primitives::U256;
 pub fn parse_value(s: &str) -> Result<String, String> {
     let s = s.trim();
 
-    if let Some(hex) = s.strip_prefix("0x") {
+    if let Some(hex) = hex_utils::require_0x(s) {
         let v = U256::from_str_radix(hex, 16).map_err(|_| format!("invalid hex value: {s}"))?;
         return Ok(format!("0x{v:x}"));
     }
@@ -95,6 +96,14 @@ mod tests {
         assert_eq!(parse_value("1000000000wei").unwrap(), "0x3b9aca00");
     }
 
+    #[test]
+    fn test_hex_uppercase_prefix() {
+        assert_eq!(
+            parse_value("0Xde0b6b3a7640000").unwrap(),
+            "0xde0b6b3a7640000"
+        );
+    }
+
     #[test]
     fn test_invalid() {
         assert!(parse_value("abc").is_err());