diff --git a/src/TokenTransferItem.tsx b/src/TokenTransferItem.tsx
index 083f7f0..5a1d5cc 100644
--- a/src/TokenTransferItem.tsx
+++ b/src/TokenTransferItem.tsx
@@ -15,7 +15,7 @@ import {
 type TokenTransferItemProps = {
   t: TokenTransfer;
   txData: TransactionData;
-  tokenMeta?: TokenMeta | undefined;
+  tokenMeta: TokenMeta | null | undefined;
 };
 
 // TODO: handle partial
diff --git a/src/components/DecoratedAddressLink.tsx b/src/components/DecoratedAddressLink.tsx
index 0b38fab..a39d2d8 100644
--- a/src/components/DecoratedAddressLink.tsx
+++ b/src/components/DecoratedAddressLink.tsx
@@ -20,7 +20,7 @@ type DecoratedAddressLinkProps = {
   selfDestruct?: boolean;
   txFrom?: boolean;
   txTo?: boolean;
-  tokenMeta?: TokenMeta;
+  tokenMeta?: TokenMeta | null | undefined;
 };
 
 const DecoratedAddresssLink: React.FC<DecoratedAddressLinkProps> = ({
diff --git a/src/transaction/Trace.tsx b/src/transaction/Trace.tsx
index 568988c..c40cbc4 100644
--- a/src/transaction/Trace.tsx
+++ b/src/transaction/Trace.tsx
@@ -3,7 +3,8 @@ import AddressHighlighter from "../components/AddressHighlighter";
 import DecoratedAddressLink from "../components/DecoratedAddressLink";
 import ContentFrame from "../ContentFrame";
 import { TransactionData } from "../types";
-import { useTraceTransaction } from "../useErigonHooks";
+import { useBatch4Bytes } from "../use4Bytes";
+import { useTraceTransaction, useUniqueSignatures } from "../useErigonHooks";
 import { RuntimeContext } from "../useRuntime";
 import TraceItem from "./TraceItem";
 
@@ -14,6 +15,8 @@ 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 +40,7 @@ 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..6bf11dd 100644
--- a/src/transaction/TraceItem.tsx
+++ b/src/transaction/TraceItem.tsx
@@ -4,29 +4,36 @@ import DecoratedAddressLink from "../components/DecoratedAddressLink";
 import FormattedBalance from "../components/FormattedBalance";
 import FunctionSignature from "./FunctionSignature";
 import { TransactionData } from "../types";
-import { rawInputTo4Bytes, use4Bytes } from "../use4Bytes";
+import { extract4Bytes, FourBytesEntry } 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 raw4Bytes = rawInputTo4Bytes(t.input);
-  const fourBytesEntry = use4Bytes(raw4Bytes);
+const TraceItem: React.FC<TraceItemProps> = ({
+  t,
+  txData,
+  last,
+  fourBytesMap,
+}) => {
+  const raw4Bytes = extract4Bytes(t.input);
+  const sigText =
+    raw4Bytes === null
+      ? "<fallback>"
+      : fourBytesMap[raw4Bytes]?.name ?? raw4Bytes;
 
   return (
     <>
-      <div className="flex">
-        <div className="relative w-5">
-          <div className="absolute border-l border-b w-full h-full transform -translate-y-1/2"></div>
-          {!last && (
-            <div className="absolute left-0 border-l w-full h-full transform translate-y-1/2"></div>
-          )}
-        </div>
-        <div className="flex items-baseline border rounded px-1 py-px">
+      <div className="flex relative">
+        <div className="absolute border-l border-b w-5 h-full transform -translate-y-1/2"></div>
+        {!last && (
+          <div className="absolute left-0 border-l w-5 h-full transform translate-y-1/2"></div>
+        )}
+        <div className="ml-5 flex items-baseline border rounded px-1 py-px">
           <span className="text-xs text-gray-400 lowercase">{t.type}</span>
           <span>
             <AddressHighlighter address={t.to}>
@@ -39,37 +46,28 @@ const TraceItem: React.FC<TraceItemProps> = ({ t, txData, last }) => {
             </AddressHighlighter>
           </span>
           <span>.</span>
-          <FunctionSignature
-            callType={t.type}
-            sig={fourBytesEntry ? fourBytesEntry.name : raw4Bytes}
-          />
+          <FunctionSignature callType={t.type} sig={sigText} />
           {t.value && !t.value.isZero() && (
             <span className="text-red-700 whitespace-nowrap">
               {"{"}value: <FormattedBalance value={t.value} /> ETH{"}"}
             </span>
           )}
-          <span>(</span>
-          {t.input.length > 10 && (
-            <span className="whitespace-nowrap">
-              input=[0x{t.input.slice(10)}]
-            </span>
-          )}
-          <span>)</span>
+          <span className="whitespace-nowrap">
+            ({t.input.length > 10 && <>input=[0x{t.input.slice(10)}]</>})
+          </span>
         </div>
       </div>
       {t.children && (
-        <div className="flex">
-          <div className={`w-10 ${last ? "" : "border-l"}`}></div>
-          <div className="space-y-3">
-            {t.children.map((tc, i, a) => (
-              <TraceItem
-                key={i}
-                t={tc}
-                txData={txData}
-                last={i === a.length - 1}
-              />
-            ))}
-          </div>
+        <div className={`pl-10 ${last ? "" : "border-l"} space-y-3`}>
+          {t.children.map((tc, i, a) => (
+            <TraceItem
+              key={i}
+              t={tc}
+              txData={txData}
+              last={i === a.length - 1}
+              fourBytesMap={fourBytesMap}
+            />
+          ))}
         </div>
       )}
     </>
diff --git a/src/types.ts b/src/types.ts
index 5904b31..e71a492 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -108,4 +108,4 @@ export type TokenMeta = {
   decimals: number;
 };
 
-export type TokenMetas = Record<string, TokenMeta>;
+export type TokenMetas = Record<string, TokenMeta | null | undefined>;
diff --git a/src/use4Bytes.ts b/src/use4Bytes.ts
index 6dab197..5b4a726 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,
@@ -14,8 +16,76 @@ const simpleTransfer: FourBytesEntry = {
 
 const fullCache = new Map<string, FourBytesEntry | null>();
 
+export const extract4Bytes = (rawInput: string): string | null => {
+  if (rawInput.length < 10) {
+    return null;
+  }
+  return rawInput.slice(0, 10);
+};
+
 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
  *
@@ -47,34 +117,12 @@ export const use4Bytes = (
       return;
     }
 
-    const signatureURL = fourBytesURL(assetsURLPrefix, fourBytes);
-    fetch(signatureURL)
-      .then(async (res) => {
-        if (!res.ok) {
-          console.error(`Signature does not exist in 4bytes DB: ${fourBytes}`);
-          fullCache.set(fourBytes, null);
-          setEntry(null);
-          return;
-        }
-
-        // 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,
-        };
-        setEntry(entry);
-        fullCache.set(fourBytes, entry);
-      })
-      .catch((err) => {
-        console.error(`Couldn't fetch signature URL ${signatureURL}`, err);
-        setEntry(null);
-        fullCache.set(fourBytes, null);
-      });
+    const loadSig = async () => {
+      const entry = await fetch4Bytes(assetsURLPrefix, fourBytes);
+      fullCache.set(fourBytes, entry);
+      setEntry(entry);
+    };
+    loadSig();
   }, [fourBytes, assetsURLPrefix]);
 
   if (rawFourBytes === "0x") {
diff --git a/src/useErigonHooks.ts b/src/useErigonHooks.ts
index dc7de4e..17d629f 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 { extract4Bytes } from "./use4Bytes";
 import { getInternalOperations } from "./nodeFunctions";
 import {
   TokenMetas,
@@ -221,7 +222,7 @@ export const useTxData = (
       // Extract token meta
       const tokenMetas: TokenMetas = {};
       for (const t of tokenTransfers) {
-        if (tokenMetas[t.token]) {
+        if (tokenMetas[t.token] !== undefined) {
           continue;
         }
         const erc20Contract = new Contract(t.token, erc20, provider);
@@ -237,6 +238,7 @@ export const useTxData = (
             decimals,
           };
         } catch (err) {
+          tokenMetas[t.token] = null;
           console.warn(`Couldn't get token ${t.token} metadata; ignoring`, err);
         }
       }
@@ -398,3 +400,43 @@ 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"
+        ) {
+          const fourBytes = extract4Bytes(t.input);
+          if (fourBytes) {
+            sigs.add(fourBytes);
+          }
+        }
+
+        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"]
 }