diff --git a/src/transaction/decoder/DecodedParamRow.tsx b/src/transaction/decoder/DecodedParamRow.tsx
index 493f6b3..f0f0013 100644
--- a/src/transaction/decoder/DecodedParamRow.tsx
+++ b/src/transaction/decoder/DecodedParamRow.tsx
@@ -1,5 +1,6 @@
 import React, { ReactNode } from "react";
 import { ParamType } from "@ethersproject/abi";
+import Uint256Decoder from "./Uint256Decoder";
 import AddressDecoder from "./AddressDecoder";
 import BooleanDecoder from "./BooleanDecoder";
 import BytesDecoder from "./BytesDecoder";
@@ -42,7 +43,9 @@ const DecodedParamRow: React.FC<DecodedParamRowProps> = ({
       </td>
       <td className="col-span-1 text-gray-500">{paramType.type}</td>
       <td className="col-span-8 pr-1 font-code break-all">
-        {paramType.baseType === "address" ? (
+        {paramType.baseType === "uint256" ? (
+          <Uint256Decoder r={r} />
+        ) : paramType.baseType === "address" ? (
           <AddressDecoder r={r} txData={txData} />
         ) : paramType.baseType === "bool" ? (
           <BooleanDecoder r={r} />
diff --git a/src/transaction/decoder/Uint256Decoder.tsx b/src/transaction/decoder/Uint256Decoder.tsx
new file mode 100644
index 0000000..65b50c1
--- /dev/null
+++ b/src/transaction/decoder/Uint256Decoder.tsx
@@ -0,0 +1,58 @@
+import React, { useState } from "react";
+import { hexlify } from "@ethersproject/bytes";
+import { commify, formatEther } from "@ethersproject/units";
+import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
+import { faSync } from "@fortawesome/free-solid-svg-icons/faSync";
+
+type Uint256DecoderProps = {
+  r: any;
+};
+
+enum DisplayMode {
+  RAW,
+  HEX,
+  EIGHTEEN_DECIMALS,
+}
+
+const Uint256Decoder: React.FC<Uint256DecoderProps> = ({ r }) => {
+  const [displayMode, setDisplayMode] = useState<DisplayMode>(
+    DisplayMode.EIGHTEEN_DECIMALS
+  );
+
+  const toggleModes = () => {
+    setDisplayMode(
+      displayMode === DisplayMode.EIGHTEEN_DECIMALS ? 0 : displayMode + 1
+    );
+  };
+
+  return (
+    <div className="flex items-baseline space-x-2">
+      <button
+        className="flex items-baseline space-x-2 rounded-lg bg-gray-50 text-gray-300 hover:text-gray-500 font-sans text-xs px-3 py-1 min-w-max"
+        onClick={toggleModes}
+      >
+        <div>
+          <FontAwesomeIcon icon={faSync} size="1x" />
+        </div>
+        <span>
+          {displayMode === DisplayMode.RAW
+            ? "Raw number"
+            : displayMode === DisplayMode.HEX
+            ? "Hex number"
+            : "18 decimals"}
+        </span>
+      </button>
+      <span>
+        {displayMode === DisplayMode.RAW ? (
+          <>{commify(r.toString())}</>
+        ) : displayMode === DisplayMode.HEX ? (
+          <>{hexlify(r)}</>
+        ) : (
+          <>{commify(formatEther(r))}</>
+        )}
+      </span>
+    </div>
+  );
+};
+
+export default React.memo(Uint256Decoder);