diff --git a/src/components/ExpanderSwitch.tsx b/src/components/ExpanderSwitch.tsx
new file mode 100644
index 0000000..71292db
--- /dev/null
+++ b/src/components/ExpanderSwitch.tsx
@@ -0,0 +1,22 @@
+import React from "react";
+import { Switch } from "@headlessui/react";
+
+type ExpanderSwitchProps = {
+  expanded: boolean;
+  setExpanded: React.Dispatch<React.SetStateAction<boolean>>;
+};
+
+const ExpanderSwitch: React.FC<ExpanderSwitchProps> = ({
+  expanded,
+  setExpanded,
+}) => (
+  <Switch
+    className="text-xs font-code"
+    checked={expanded}
+    onChange={setExpanded}
+  >
+    {expanded ? <span className="text-gray-400">[-]</span> : <>[...]</>}
+  </Switch>
+);
+
+export default ExpanderSwitch;
diff --git a/src/transaction/Details.tsx b/src/transaction/Details.tsx
index 36141ca..ca21ea4 100644
--- a/src/transaction/Details.tsx
+++ b/src/transaction/Details.tsx
@@ -1,4 +1,5 @@
-import React, { useContext, useMemo } from "react";
+import React, { useContext, useMemo, useState } from "react";
+import { Tab } from "@headlessui/react";
 import { TransactionDescription } from "@ethersproject/abi";
 import { BigNumber } from "@ethersproject/bignumber";
 import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
@@ -8,6 +9,8 @@ import { faTimesCircle } from "@fortawesome/free-solid-svg-icons/faTimesCircle";
 import ContentFrame from "../ContentFrame";
 import InfoRow from "../components/InfoRow";
 import BlockLink from "../components/BlockLink";
+import ModeTab from "../components/ModeTab";
+import ExpanderSwitch from "../components/ExpanderSwitch";
 import BlockConfirmations from "../components/BlockConfirmations";
 import TransactionAddress from "../components/TransactionAddress";
 import Copy from "../components/Copy";
@@ -97,7 +100,11 @@ const Details: React.FC<DetailsProps> = ({
     return _addresses;
   }, [txData]);
   const metadatas = useContractsMetadata(addresses, provider);
-  const errorMsg = useTransactionError(provider, txData.transactionHash);
+  const [errorMsg, outputData, isCustomError] = useTransactionError(
+    provider,
+    txData.transactionHash
+  );
+  const [expanded, setExpanded] = useState<boolean>(false);
 
   return (
     <ContentFrame tabs>
@@ -111,24 +118,75 @@ const Details: React.FC<DetailsProps> = ({
         {txData.confirmedData === undefined ? (
           <span className="italic text-gray-400">Pending</span>
         ) : txData.confirmedData.status ? (
-          <span className="flex items-center w-min rounded-lg space-x-1 px-3 py-1 bg-green-50 text-green-500 text-xs">
-            <FontAwesomeIcon icon={faCheckCircle} size="1x" />
+          <span className="flex items-baseline w-min rounded-lg space-x-1 px-3 py-1 bg-green-50 text-green-500 text-xs">
+            <FontAwesomeIcon
+              className="self-center"
+              icon={faCheckCircle}
+              size="1x"
+            />
             <span>Success</span>
           </span>
         ) : (
-          <div className="inline-flex justify-start items-center rounded-lg space-x-1 px-3 py-1 bg-red-50 text-red-500 text-xs">
-            <FontAwesomeIcon icon={faTimesCircle} size="1x" />
-            <span>
-              Fail
-              {errorMsg && (
-                <>
-                  {" "}
-                  with revert message: '
-                  <span className="font-bold underline">{errorMsg}</span>'
-                </>
+          <>
+            <div className="flex space-x-1 items-baseline">
+              <div className="flex rounded-lg space-x-1 px-3 py-1 bg-red-50 text-red-500 text-xs">
+                <FontAwesomeIcon
+                  className="self-center"
+                  icon={faTimesCircle}
+                  size="1x"
+                />
+                <span>
+                  Fail
+                  {errorMsg && (
+                    <>
+                      {" "}
+                      with revert message: '
+                      <span className="font-bold underline">{errorMsg}</span>'
+                    </>
+                  )}
+                  {isCustomError && <> with custom error</>}
+                </span>
+              </div>
+              {isCustomError && (
+                <ExpanderSwitch expanded={expanded} setExpanded={setExpanded} />
               )}
-            </span>
-          </div>
+            </div>
+            {expanded && (
+              <Tab.Group>
+                <Tab.List className="flex space-x-1 mt-2 mb-1">
+                  <ModeTab disabled={!resolvedTxDesc}>Decoded</ModeTab>
+                  <ModeTab>Raw</ModeTab>
+                </Tab.List>
+                <Tab.Panels>
+                  <Tab.Panel>
+                    {/* {fourBytes === "0x" ? (
+                    <>No parameters</>
+                  ) : resolvedTxDesc === undefined ? (
+                    <>Waiting for data...</>
+                  ) : resolvedTxDesc === null ? (
+                    <>Can't decode data</>
+                  ) : (
+                    <DecodedParamsTable
+                      args={resolvedTxDesc.args}
+                      paramTypes={resolvedTxDesc.functionFragment.inputs}
+                      hasParamNames={hasParamNames}
+                      userMethod={userMethod}
+                      devMethod={devMethod}
+                      resolvedAddresses={resolvedAddresses}
+                    />
+                  )} */}
+                  </Tab.Panel>
+                  <Tab.Panel>
+                    <textarea
+                      className="w-full h-40 bg-gray-50 text-gray-500 font-mono focus:outline-none border rounded p-2"
+                      value={outputData}
+                      readOnly
+                    />
+                  </Tab.Panel>
+                </Tab.Panels>
+              </Tab.Group>
+            )}
+          </>
         )}
       </InfoRow>
       {txData.confirmedData && (
diff --git a/src/transaction/TraceInput.tsx b/src/transaction/TraceInput.tsx
index 667977e..f7e4713 100644
--- a/src/transaction/TraceInput.tsx
+++ b/src/transaction/TraceInput.tsx
@@ -1,11 +1,11 @@
 import React, { useState } from "react";
-import { Switch } from "@headlessui/react";
 import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
 import { faBomb } from "@fortawesome/free-solid-svg-icons/faBomb";
 import TransactionAddress from "../components/TransactionAddress";
 import FormattedBalance from "../components/FormattedBalance";
 import FunctionSignature from "./FunctionSignature";
 import InputDecoder from "./decoder/InputDecoder";
+import ExpanderSwitch from "../components/ExpanderSwitch";
 import { TraceEntry } from "../useErigonHooks";
 import { ResolvedAddresses } from "../api/address-resolver";
 import {
@@ -71,17 +71,10 @@ const TraceInput: React.FC<TraceInputProps> = ({
                 <span className="whitespace-nowrap">
                   (
                   {hasParams && (
-                    <Switch
-                      className="text-xs"
-                      checked={expanded}
-                      onChange={setExpanded}
-                    >
-                      {expanded ? (
-                        <span className="text-gray-400">[-]</span>
-                      ) : (
-                        <>[...]</>
-                      )}
-                    </Switch>
+                    <ExpanderSwitch
+                      expanded={expanded}
+                      setExpanded={setExpanded}
+                    />
                   )}
                   {(!hasParams || !expanded) && <>)</>}
                 </span>
diff --git a/src/useErigonHooks.ts b/src/useErigonHooks.ts
index ff70e38..66fe480 100644
--- a/src/useErigonHooks.ts
+++ b/src/useErigonHooks.ts
@@ -492,12 +492,16 @@ const ERROR_MESSAGE_SELECTOR = "0x08c379a0";
 export const useTransactionError = (
   provider: JsonRpcProvider | undefined,
   txHash: string
-): string | undefined => {
+): [string | undefined, string | undefined, boolean | undefined] => {
   const [errorMsg, setErrorMsg] = useState<string | undefined>();
+  const [data, setData] = useState<string | undefined>();
+  const [isCustomError, setCustomError] = useState<boolean | undefined>();
 
   useEffect(() => {
     // Reset
     setErrorMsg(undefined);
+    setData(undefined);
+    setCustomError(undefined);
 
     if (provider === undefined) {
       return;
@@ -510,6 +514,9 @@ export const useTransactionError = (
 
       // Empty or success
       if (result === "0x") {
+        setErrorMsg(undefined);
+        setData(result);
+        setCustomError(false);
         return;
       }
 
@@ -522,11 +529,17 @@ export const useTransactionError = (
           "0x" + result.substr(10)
         );
         setErrorMsg(msg[0]);
+        setData(result);
+        setCustomError(false);
         return;
       }
+
+      setErrorMsg(undefined);
+      setData(result);
+      setCustomError(true);
     };
     readCodes();
   }, [provider, txHash]);
 
-  return errorMsg;
+  return [errorMsg, data, isCustomError];
 };