diff --git a/src/transformers/_common/netAssetTransfers.ts b/src/transformers/_common/netAssetTransfers.ts
index e61dbb5..40cf44f 100644
--- a/src/transformers/_common/netAssetTransfers.ts
+++ b/src/transformers/_common/netAssetTransfers.ts
@@ -6,152 +6,161 @@ import {
   ERC1155Asset,
   ERC20Asset,
   ETHAsset,
+  AssetTransfer,
 } from '../../types';
 
-export function transform(block: RawBlock): RawBlock {
-  block.transactions = block.transactions.map((tx) => {
-    const assetTransfers = tx.assetTransfers;
-    if (!assetTransfers?.length) {
-      return tx;
+export function extractNetAssetTransfers(
+  assetTransfers: AssetTransfer[],
+): NetAssetTransfers {
+  const assetsById: Record<string, Asset> = {};
+  const netAssetsByAddress: Record<string, Record<string, bigint>> = {};
+
+  for (const assetTransfer of assetTransfers) {
+    if (
+      assetTransfer.from === assetTransfer.to ||
+      !assetTransfer.from ||
+      !assetTransfer.to
+    ) {
+      continue;
+    }
+
+    let asset: Asset | undefined = undefined;
+    let assetValue = BigInt(0);
+    let assetId = '';
+    switch (assetTransfer.type) {
+      case 'erc721':
+        asset = {
+          contract: assetTransfer.contract,
+          tokenId: assetTransfer.tokenId,
+          type: assetTransfer.type,
+        };
+        assetValue = BigInt(1);
+        assetId = `${assetTransfer.contract}-${assetTransfer.tokenId}`;
+        break;
+      case 'erc1155':
+        asset = {
+          contract: assetTransfer.contract,
+          tokenId: assetTransfer.tokenId,
+          type: assetTransfer.type,
+          value: assetTransfer.value,
+        };
+        assetValue = BigInt(assetTransfer.value);
+        assetId = `${assetTransfer.contract}-${assetTransfer.tokenId}`;
+        break;
+      case 'erc20':
+        asset = {
+          contract: assetTransfer.contract,
+          type: assetTransfer.type,
+          value: assetTransfer.value,
+        };
+        assetValue = BigInt(assetTransfer.value);
+        assetId = `${assetTransfer.contract}`;
+        break;
+      case 'eth':
+        asset = {
+          type: assetTransfer.type,
+          value: assetTransfer.value,
+        };
+        assetValue = BigInt(assetTransfer.value);
+        assetId = 'eth';
+        break;
     }
 
-    const assetsById: Record<string, Asset> = {};
-    const netAssetsByAddress: Record<string, Record<string, bigint>> = {};
+    if (!asset || !assetId) {
+      continue;
+    }
 
-    for (const assetTransfer of assetTransfers) {
-      if (
-        assetTransfer.from === assetTransfer.to ||
-        !assetTransfer.from ||
-        !assetTransfer.to
-      ) {
-        continue;
-      }
+    if (!netAssetsByAddress[assetTransfer.from]) {
+      netAssetsByAddress[assetTransfer.from] = {};
+    }
+    if (!netAssetsByAddress[assetTransfer.to]) {
+      netAssetsByAddress[assetTransfer.to] = {};
+    }
+    if (!netAssetsByAddress[assetTransfer.from][assetId]) {
+      netAssetsByAddress[assetTransfer.from][assetId] = BigInt(0);
+    }
+    if (!netAssetsByAddress[assetTransfer.to][assetId]) {
+      netAssetsByAddress[assetTransfer.to][assetId] = BigInt(0);
+    }
 
-      let asset: Asset | undefined = undefined;
-      let assetValue = BigInt(0);
-      let assetId = '';
-      switch (assetTransfer.type) {
-        case 'erc721':
-          asset = {
-            contract: assetTransfer.contract,
-            tokenId: assetTransfer.tokenId,
-            type: assetTransfer.type,
-          };
-          assetValue = BigInt(1);
-          assetId = `${assetTransfer.contract}-${assetTransfer.tokenId}`;
-          break;
-        case 'erc1155':
-          asset = {
-            contract: assetTransfer.contract,
-            tokenId: assetTransfer.tokenId,
-            type: assetTransfer.type,
-            value: assetTransfer.value,
-          };
-          assetValue = BigInt(assetTransfer.value);
-          assetId = `${assetTransfer.contract}-${assetTransfer.tokenId}`;
-          break;
-        case 'erc20':
-          asset = {
-            contract: assetTransfer.contract,
-            type: assetTransfer.type,
-            value: assetTransfer.value,
-          };
-          assetValue = BigInt(assetTransfer.value);
-          assetId = `${assetTransfer.contract}`;
-          break;
-        case 'eth':
-          asset = {
-            type: assetTransfer.type,
-            value: assetTransfer.value,
-          };
-          assetValue = BigInt(assetTransfer.value);
-          assetId = 'eth';
-          break;
-      }
+    assetsById[assetId] = asset;
+    netAssetsByAddress[assetTransfer.from][assetId] =
+      netAssetsByAddress[assetTransfer.from][assetId] - BigInt(assetValue);
+    netAssetsByAddress[assetTransfer.to][assetId] =
+      netAssetsByAddress[assetTransfer.to][assetId] + BigInt(assetValue);
+  }
 
-      if (!asset || !assetId) {
+  const netAssetTransfers: NetAssetTransfers = {};
+  for (const [address, assets] of Object.entries(netAssetsByAddress)) {
+    for (const [id, value] of Object.entries(assets)) {
+      if (value === BigInt(0)) {
         continue;
       }
 
-      if (!netAssetsByAddress[assetTransfer.from]) {
-        netAssetsByAddress[assetTransfer.from] = {};
+      if (!netAssetTransfers[address]) {
+        netAssetTransfers[address] = { received: [], sent: [] };
       }
-      if (!netAssetsByAddress[assetTransfer.to]) {
-        netAssetsByAddress[assetTransfer.to] = {};
-      }
-      if (!netAssetsByAddress[assetTransfer.from][assetId]) {
-        netAssetsByAddress[assetTransfer.from][assetId] = BigInt(0);
-      }
-      if (!netAssetsByAddress[assetTransfer.to][assetId]) {
-        netAssetsByAddress[assetTransfer.to][assetId] = BigInt(0);
-      }
-
-      assetsById[assetId] = asset;
-      netAssetsByAddress[assetTransfer.from][assetId] =
-        netAssetsByAddress[assetTransfer.from][assetId] - BigInt(assetValue);
-      netAssetsByAddress[assetTransfer.to][assetId] =
-        netAssetsByAddress[assetTransfer.to][assetId] + BigInt(assetValue);
-    }
 
-    const netAssetTransfers: NetAssetTransfers = {};
-    for (const [address, assets] of Object.entries(netAssetsByAddress)) {
-      for (const [id, value] of Object.entries(assets)) {
-        if (value === BigInt(0)) {
-          continue;
-        }
-
-        if (!netAssetTransfers[address]) {
-          netAssetTransfers[address] = { received: [], sent: [] };
-        }
+      const type = assetsById[id].type;
+      let assetTransferred: Asset = {
+        type: AssetType.ETH,
+        value: '',
+      };
 
-        const type = assetsById[id].type;
-        let assetTransferred: Asset = {
-          type: AssetType.ETH,
-          value: '',
+      if (type === AssetType.ERC721) {
+        assetTransferred = {
+          ...assetsById[id],
         };
-
-        if (type === AssetType.ERC721) {
-          assetTransferred = {
-            ...assetsById[id],
-          };
-        } else {
-          switch (assetsById[id].type) {
-            case AssetType.ERC1155:
-              assetTransferred = assetsById[id] as ERC1155Asset;
-              assetTransferred.value =
-                value > BigInt(0)
-                  ? value.toString()
-                  : (value * BigInt(-1)).toString();
-              break;
-            case AssetType.ERC20:
-              assetTransferred = assetsById[id] as ERC20Asset;
-              assetTransferred.value =
-                value > BigInt(0)
-                  ? value.toString()
-                  : (value * BigInt(-1)).toString();
-              break;
-            case AssetType.ETH:
-              assetTransferred = assetsById[id] as ETHAsset;
-              assetTransferred.value =
-                value > BigInt(0)
-                  ? value.toString()
-                  : (value * BigInt(-1)).toString();
-              break;
-          }
+      } else {
+        switch (assetsById[id].type) {
+          case AssetType.ERC1155:
+            assetTransferred = assetsById[id] as ERC1155Asset;
+            assetTransferred.value =
+              value > BigInt(0)
+                ? value.toString()
+                : (value * BigInt(-1)).toString();
+            break;
+          case AssetType.ERC20:
+            assetTransferred = assetsById[id] as ERC20Asset;
+            assetTransferred.value =
+              value > BigInt(0)
+                ? value.toString()
+                : (value * BigInt(-1)).toString();
+            break;
+          case AssetType.ETH:
+            assetTransferred = assetsById[id] as ETHAsset;
+            assetTransferred.value =
+              value > BigInt(0)
+                ? value.toString()
+                : (value * BigInt(-1)).toString();
+            break;
         }
+      }
 
-        if (value < BigInt(0)) {
-          netAssetTransfers[address].sent.push(assetTransferred);
-        } else {
-          netAssetTransfers[address].received.push(assetTransferred);
-        }
+      if (value < BigInt(0)) {
+        netAssetTransfers[address].sent.push(assetTransferred);
+      } else {
+        netAssetTransfers[address].received.push(assetTransferred);
       }
     }
+  }
+
+  if (Object.keys(netAssetTransfers).length > 0) {
+    return netAssetTransfers;
+  }
 
-    if (Object.keys(netAssetTransfers).length > 0) {
-      tx.netAssetTransfers = netAssetTransfers;
+  return {};
+}
+
+export function transform(block: RawBlock): RawBlock {
+  block.transactions = block.transactions.map((tx) => {
+    const assetTransfers = tx.assetTransfers;
+    if (!assetTransfers?.length) {
+      return tx;
     }
 
+    tx.netAssetTransfers = extractNetAssetTransfers(assetTransfers);
+
     return tx;
   });
 
diff --git a/src/transformers/index.ts b/src/transformers/index.ts
index d7f3801..fa2203e 100644
--- a/src/transformers/index.ts
+++ b/src/transformers/index.ts
@@ -1,4 +1,4 @@
-import { RawBlock } from 'src/types';
+import { AssetTransfer, NetAssetTransfers, RawBlock } from 'src/types';
 import { makeTransform } from '../helpers/utils';
 import * as transactionAssetTransfers from './_common/assetTransfers';
 import * as transactionDelegateCalls from './_common/delegateCalls';
@@ -28,6 +28,11 @@ const children = {
   transactionForks,
 };
 
+const utils = {
+  extractNetAssetTransfers:
+    transactionNetAssetTransfers.extractNetAssetTransfers,
+};
+
 const transformers = Object.fromEntries(
   Object.keys(children).map((key) => [key, children[key].transform]),
 );
@@ -37,9 +42,15 @@ const transform = makeTransform(transformers);
 type UsabilityTransformer = {
   transform: (block: RawBlock) => RawBlock;
   children: Record<string, unknown>;
+  utils: {
+    extractNetAssetTransfers: (
+      assetTransfers: AssetTransfer[],
+    ) => NetAssetTransfers;
+  };
 };
 
 export const transformer: UsabilityTransformer = {
   transform,
   children,
+  utils,
 };