diff --git a/src/transaction/Trace.tsx b/src/transaction/Trace.tsx
index 568988c..da0b24a 100644
--- a/src/transaction/Trace.tsx
+++ b/src/transaction/Trace.tsx
@@ -1,9 +1,14 @@
-import React, { useContext } from "react";
+import React, { useContext, useMemo } from "react";
 import AddressHighlighter from "../components/AddressHighlighter";
 import DecoratedAddressLink from "../components/DecoratedAddressLink";
 import ContentFrame from "../ContentFrame";
 import { TransactionData } from "../types";
-import { useTraceTransaction } from "../useErigonHooks";
+import { rawInputTo4Bytes, useBatch4Bytes } from "../use4Bytes";
+import {
+  TraceGroup,
+  useTraceTransaction,
+  useUniqueSignatures,
+} from "../useErigonHooks";
 import { RuntimeContext } from "../useRuntime";
 import TraceItem from "./TraceItem";
 
@@ -14,6 +19,8 @@ type TraceProps = {
 const Trace: React.FC<TraceProps> = ({ txData }) => {
   const { provider } = useContext(RuntimeContext);
   const traces = useTraceTransaction(provider, txData.transactionHash);
+  const uniqueSignatures = useUniqueSignatures(traces);
+  const sigMap = useBatch4Bytes(uniqueSignatures);
 
   return (
     <ContentFrame tabs>
@@ -37,6 +44,7 @@ const Trace: React.FC<TraceProps> = ({ txData }) => {
                 t={t}
                 txData={txData}
                 last={i === a.length - 1}
+                fourBytesMap={sigMap}
               />
             ))}
           </div>
diff --git a/src/transaction/TraceItem.tsx b/src/transaction/TraceItem.tsx
index f8e2288..e5390a8 100644
--- a/src/transaction/TraceItem.tsx
+++ b/src/transaction/TraceItem.tsx
@@ -4,18 +4,24 @@ import DecoratedAddressLink from "../components/DecoratedAddressLink";
 import FormattedBalance from "../components/FormattedBalance";
 import FunctionSignature from "./FunctionSignature";
 import { TransactionData } from "../types";
-import { rawInputTo4Bytes, use4Bytes } from "../use4Bytes";
+import { FourBytesEntry, rawInputTo4Bytes } from "../use4Bytes";
 import { TraceGroup } from "../useErigonHooks";
 
 type TraceItemProps = {
   t: TraceGroup;
   txData: TransactionData;
   last: boolean;
+  fourBytesMap: Record<string, FourBytesEntry | null | undefined>;
 };
 
-const TraceItem: React.FC<TraceItemProps> = ({ t, txData, last }) => {
+const TraceItem: React.FC<TraceItemProps> = ({
+  t,
+  txData,
+  last,
+  fourBytesMap,
+}) => {
   const raw4Bytes = rawInputTo4Bytes(t.input);
-  const fourBytesEntry = use4Bytes(raw4Bytes);
+  const fourBytesEntry = fourBytesMap[raw4Bytes];
 
   return (
     <>
@@ -67,6 +73,7 @@ const TraceItem: React.FC<TraceItemProps> = ({ t, txData, last }) => {
                 t={tc}
                 txData={txData}
                 last={i === a.length - 1}
+                fourBytesMap={fourBytesMap}
               />
             ))}
           </div>
diff --git a/src/use4Bytes.ts b/src/use4Bytes.ts
index 6dab197..380c45e 100644
--- a/src/use4Bytes.ts
+++ b/src/use4Bytes.ts
@@ -7,6 +7,8 @@ export type FourBytesEntry = {
   signature: string | undefined;
 };
 
+export type FourBytesMap = Record<string, FourBytesEntry | null | undefined>;
+
 const simpleTransfer: FourBytesEntry = {
   name: "Transfer",
   signature: undefined,
@@ -16,6 +18,67 @@ const fullCache = new Map<string, FourBytesEntry | null>();
 
 export const rawInputTo4Bytes = (rawInput: string) => rawInput.slice(0, 10);
 
+const fetch4Bytes = async (
+  assetsURLPrefix: string,
+  fourBytes: string
+): Promise<FourBytesEntry | null> => {
+  const signatureURL = fourBytesURL(assetsURLPrefix, fourBytes);
+
+  try {
+    const res = await fetch(signatureURL);
+    if (!res.ok) {
+      console.error(`Signature does not exist in 4bytes DB: ${fourBytes}`);
+      return null;
+    }
+
+    // Get only the first occurrence, for now ignore alternative param names
+    const sigs = await res.text();
+    const sig = sigs.split(";")[0];
+    const cut = sig.indexOf("(");
+    const method = sig.slice(0, cut);
+
+    const entry: FourBytesEntry = {
+      name: method,
+      signature: sig,
+    };
+    return entry;
+  } catch (err) {
+    console.error(`Couldn't fetch signature URL ${signatureURL}`, err);
+    return null;
+  }
+};
+
+export const useBatch4Bytes = (
+  rawFourByteSigs: string[] | undefined
+): FourBytesMap => {
+  const runtime = useContext(RuntimeContext);
+  const assetsURLPrefix = runtime.config?.assetsURLPrefix;
+
+  const [fourBytesMap, setFourBytesMap] = useState<FourBytesMap>({});
+  useEffect(() => {
+    if (!rawFourByteSigs || !assetsURLPrefix) {
+      setFourBytesMap({});
+      return;
+    }
+
+    const loadSigs = async () => {
+      const promises = rawFourByteSigs.map((s) =>
+        fetch4Bytes(assetsURLPrefix, s.slice(2))
+      );
+      const results = await Promise.all(promises);
+
+      const _fourBytesMap: Record<string, FourBytesEntry | null> = {};
+      for (let i = 0; i < rawFourByteSigs.length; i++) {
+        _fourBytesMap[rawFourByteSigs[i]] = results[i];
+      }
+      setFourBytesMap(_fourBytesMap);
+    };
+    loadSigs();
+  }, [assetsURLPrefix, rawFourByteSigs]);
+
+  return fourBytesMap;
+};
+
 /**
  * Extract 4bytes DB info
  *
diff --git a/src/useErigonHooks.ts b/src/useErigonHooks.ts
index dc7de4e..0d094ba 100644
--- a/src/useErigonHooks.ts
+++ b/src/useErigonHooks.ts
@@ -1,10 +1,11 @@
-import { useState, useEffect } from "react";
+import { useState, useEffect, useMemo } from "react";
 import { Block, BlockWithTransactions } from "@ethersproject/abstract-provider";
 import { JsonRpcProvider } from "@ethersproject/providers";
 import { getAddress } from "@ethersproject/address";
 import { Contract } from "@ethersproject/contracts";
 import { BigNumber } from "@ethersproject/bignumber";
 import { arrayify, hexDataSlice, isHexString } from "@ethersproject/bytes";
+import { rawInputTo4Bytes } from "./use4Bytes";
 import { getInternalOperations } from "./nodeFunctions";
 import {
   TokenMetas,
@@ -398,3 +399,38 @@ export const useTraceTransaction = (
 
   return traceGroups;
 };
+
+/**
+ * Flatten a trace tree and extract and dedup 4byte function signatures
+ */
+export const useUniqueSignatures = (traces: TraceGroup[] | undefined) => {
+  const uniqueSignatures = useMemo(() => {
+    if (!traces) {
+      return undefined;
+    }
+
+    const sigs = new Set<string>();
+    let nextTraces: TraceGroup[] = [...traces];
+    while (nextTraces.length > 0) {
+      const traces = nextTraces;
+      nextTraces = [];
+      for (const t of traces) {
+        if (
+          t.type === "CALL" ||
+          t.type === "DELEGATECALL" ||
+          t.type === "STATICCALL" ||
+          t.type === "CALLCODE"
+        ) {
+          sigs.add(rawInputTo4Bytes(t.input));
+        }
+        if (t.children) {
+          nextTraces.push(...t.children);
+        }
+      }
+    }
+
+    return [...sigs];
+  }, [traces]);
+
+  return uniqueSignatures;
+};
diff --git a/tsconfig.json b/tsconfig.json
index 9d379a3..23c0098 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -14,7 +14,8 @@
     "resolveJsonModule": true,
     "isolatedModules": true,
     "noEmit": true,
-    "jsx": "react-jsx"
+    "jsx": "react-jsx",
+    "downlevelIteration": true
   },
   "include": ["src"]
 }