diff --git a/crates/cli/src/utils/cmd.rs b/crates/cli/src/utils/cmd.rs
index 1e4af95dfdf55..01e7ab3cd2e12 100644
--- a/crates/cli/src/utils/cmd.rs
+++ b/crates/cli/src/utils/cmd.rs
@@ -1,7 +1,7 @@
 use alloy_json_abi::JsonAbi;
 use alloy_primitives::Address;
 use eyre::{Result, WrapErr};
-use foundry_common::{cli_warn, fs, TestFunctionExt};
+use foundry_common::{cli_warn, fs, selectors::OpenChainClient, TestFunctionExt};
 use foundry_compilers::{
     artifacts::{CompactBytecode, CompactDeployedBytecode, Settings},
     cache::{CacheEntry, CompilerCache},
@@ -379,6 +379,7 @@ pub async fn handle_traces(
             Config::foundry_cache_dir(),
             config.offline,
         )?)
+        .with_openchain_client(OpenChainClient::new()?)
         .build();
 
     let mut etherscan_identifier = EtherscanIdentifier::new(config, chain)?;
diff --git a/crates/common/src/abi.rs b/crates/common/src/abi.rs
index bcf82b1cddd4c..89cd0335751ee 100644
--- a/crates/common/src/abi.rs
+++ b/crates/common/src/abi.rs
@@ -1,7 +1,7 @@
 //! ABI related helper functions.
 
 use alloy_dyn_abi::{DynSolType, DynSolValue, FunctionExt, JsonAbiExt};
-use alloy_json_abi::{Event, Function, Param};
+use alloy_json_abi::{Error, Event, Function, Param};
 use alloy_primitives::{hex, Address, LogData};
 use eyre::{Context, ContextCompat, Result};
 use foundry_block_explorers::{contract::ContractMetadata, errors::EtherscanError, Client};
@@ -85,6 +85,10 @@ pub fn get_event(sig: &str) -> Result<Event> {
     Event::parse(sig).wrap_err("could not parse event signature")
 }
 
+pub fn get_error(sig: &str) -> Result<Error> {
+    Error::parse(sig).wrap_err("could not parse error signature")
+}
+
 /// Given an event without indexed parameters and a rawlog, it tries to return the event with the
 /// proper indexed parameters. Otherwise, it returns the original event.
 pub fn get_indexed_event(mut event: Event, raw_log: &LogData) -> Event {
diff --git a/crates/evm/core/src/decode.rs b/crates/evm/core/src/decode.rs
index 29f448bcebd58..699b7dc0c7c7f 100644
--- a/crates/evm/core/src/decode.rs
+++ b/crates/evm/core/src/decode.rs
@@ -5,11 +5,15 @@ use alloy_dyn_abi::JsonAbiExt;
 use alloy_json_abi::{Error, JsonAbi};
 use alloy_primitives::{hex, Log, Selector};
 use alloy_sol_types::{SolCall, SolError, SolEventInterface, SolInterface, SolValue};
-use foundry_common::SELECTOR_LEN;
+use foundry_common::{abi::get_error, selectors::OpenChainClient, SELECTOR_LEN};
 use itertools::Itertools;
 use revm::interpreter::InstructionResult;
 use rustc_hash::FxHashMap;
-use std::sync::OnceLock;
+use std::{
+    sync::{mpsc, OnceLock},
+    thread,
+};
+use tokio::runtime::Handle;
 
 /// Decode a set of logs, only returning logs from DSTest logging events and Hardhat's `console.log`
 pub fn decode_console_logs(logs: &[Log]) -> Vec<String> {
@@ -29,6 +33,7 @@ pub fn decode_console_log(log: &Log) -> Option<String> {
 pub struct RevertDecoder {
     /// The custom errors to use for decoding.
     pub errors: FxHashMap<Selector, Vec<Error>>,
+    pub open_chain_client: Option<OpenChainClient>,
 }
 
 impl Default for &RevertDecoder {
@@ -183,6 +188,44 @@ impl RevertDecoder {
             std::str::from_utf8(data).map_or_else(|_| trimmed_hex(data), String::from)
         ))
     }
+
+    pub fn may_decode_using_open_chain(&self, err: &[u8]) -> Option<String> {
+        let (selector, data) = err.split_at(SELECTOR_LEN);
+        // try from https://openchain.xyz
+        if let Some(client) = self.open_chain_client.clone() {
+            if let Ok(handle) = Handle::try_current() {
+                let (tx, rx) = mpsc::channel();
+                let encoded_selector = hex::encode(selector);
+                thread::spawn(move || {
+                    let result =
+                        handle.block_on(client.decode_function_selector(&encoded_selector));
+                    tx.send(result).unwrap();
+                });
+
+                let result = match rx.recv() {
+                    Ok(Ok(sigs)) => Some(sigs),
+                    Ok(Err(_)) | Err(_) => None,
+                };
+                if let Some(sigs) = result {
+                    for sig in sigs {
+                        if let Ok(error) = get_error(&sig) {
+                            if let Ok(decoded) = error.abi_decode_input(data, true) {
+                                return Some(format!(
+                                    "{}({})",
+                                    error.name,
+                                    decoded
+                                        .iter()
+                                        .map(foundry_common::fmt::format_token)
+                                        .format(", ")
+                                ));
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        None
+    }
 }
 
 fn trimmed_hex(s: &[u8]) -> String {
diff --git a/crates/evm/traces/src/decoder/mod.rs b/crates/evm/traces/src/decoder/mod.rs
index c8d1e461abbe8..07e561cd51abd 100644
--- a/crates/evm/traces/src/decoder/mod.rs
+++ b/crates/evm/traces/src/decoder/mod.rs
@@ -9,7 +9,8 @@ use alloy_dyn_abi::{DecodedEvent, DynSolValue, EventExt, FunctionExt, JsonAbiExt
 use alloy_json_abi::{Error, Event, Function, JsonAbi};
 use alloy_primitives::{Address, LogData, Selector, B256};
 use foundry_common::{
-    abi::get_indexed_event, fmt::format_token, get_contract_name, ContractsByArtifact, SELECTOR_LEN,
+    abi::get_indexed_event, fmt::format_token, get_contract_name, selectors::OpenChainClient,
+    ContractsByArtifact, SELECTOR_LEN,
 };
 use foundry_evm_core::{
     abi::{Console, HardhatConsole, Vm, HARDHAT_CONSOLE_SELECTOR_PATCHES},
@@ -89,6 +90,13 @@ impl CallTraceDecoderBuilder {
         self
     }
 
+    /// Sets the openchain client.
+    #[inline]
+    pub fn with_openchain_client(mut self, client: OpenChainClient) -> Self {
+        self.decoder.revert_decoder.open_chain_client = Some(client);
+        self
+    }
+
     /// Sets the debug identifier for the decoder.
     #[inline]
     pub fn with_debug_identifier(mut self, identifier: DebugTraceIdentifier) -> Self {
@@ -565,7 +573,15 @@ impl CallTraceDecoder {
 
     /// The default decoded return data for a trace.
     fn default_return_data(&self, trace: &CallTrace) -> Option<String> {
-        (!trace.success).then(|| self.revert_decoder.decode(&trace.output, Some(trace.status)))
+        (!trace.success).then(|| {
+            let err_str = self.revert_decoder.decode(&trace.output, Some(trace.status));
+            if err_str.contains("custom error") {
+                if let Some(err) = self.revert_decoder.may_decode_using_open_chain(&trace.output) {
+                    return err;
+                }
+            }
+            err_str
+        })
     }
 
     /// Decodes an event.