diff --git a/balancer-js/examples/data/onchain-multicall3.ts b/balancer-js/examples/data/onchain-multicall3.ts
new file mode 100644
index 000000000..c91d11f2e
--- /dev/null
+++ b/balancer-js/examples/data/onchain-multicall3.ts
@@ -0,0 +1,66 @@
+import { PoolsSubgraphRepository } from '@/modules/data/pool/subgraph'
+import { getOnChainBalances as getOnChainBalances3 } from '@/modules/sor/pool-data/onChainData3'
+import { getOnChainBalances } from '@/modules/sor/pool-data/onChainData'
+import { JsonRpcProvider } from '@ethersproject/providers'
+import _ from 'lodash'
+
+const pools = new PoolsSubgraphRepository({
+  url: 'https://api.thegraph.com/subgraphs/name/balancer-labs/balancer-v2',
+  chainId: 1,
+  query: {
+    args: {
+      first: 10,
+      where: {
+        poolType: {
+          eq: "MetaStable"
+        },
+      },
+    },
+    attrs: {},
+  },
+})
+
+// const provider = new JsonRpcProvider('https://eth-mainnet.alchemyapi.io/v2/7gYoDJEw6-QyVP5hd2UfZyelzDIDemGz')
+const provider = new JsonRpcProvider('http://127.0.0.1:8545')
+
+function findNestedValueDifferences(object1: any, object2: any, path = ''): any {
+  const allKeys = _.union(Object.keys(object1), Object.keys(object2))
+
+  const differences = []
+
+  for (const key of allKeys) {
+    const newPath = path ? `${path}.${key}` : key
+
+    if (_.isObject(object1[key]) && _.isObject(object2[key])) {
+      differences.push(...findNestedValueDifferences(object1[key], object2[key], newPath))
+    } else if (!_.isEqual(object1[key], object2[key])) {
+      differences.push({
+        path: newPath,
+        value1: object1[key],
+        value2: object2[key]
+      })
+    }
+  }
+
+  return differences
+}
+
+async function main() {
+  const subgraph = await pools.fetch();
+  const onchain3 = await getOnChainBalances3(subgraph, '', '', provider);
+  const onchain = await getOnChainBalances(subgraph, '0xeefba1e63905ef1d7acba5a8513c70307c1ce441', '0xBA12222222228d8Ba445958a75a0704d566BF2C8', provider);
+  for(const i in subgraph) {
+    const one = onchain3.find((x) => x.id === subgraph[i].id)
+    const two = onchain.find((x) => x.id === subgraph[i].id)
+    console.log('Pool', subgraph[i].id)
+    if (!two) {
+      console.log('two missing')
+      continue
+    }
+    console.log(JSON.stringify(findNestedValueDifferences(one, two), null, 2));
+  }
+}
+
+main()
+
+// yarn example ./examples/data/onchain-multicall3.ts
diff --git a/balancer-js/src/modules/sor/pool-data/onChainData3.ts b/balancer-js/src/modules/sor/pool-data/onChainData3.ts
new file mode 100644
index 000000000..53585a08e
--- /dev/null
+++ b/balancer-js/src/modules/sor/pool-data/onChainData3.ts
@@ -0,0 +1,219 @@
+import { Multicaller3 } from '@/lib/utils/multiCaller3';
+import { Provider } from '@ethersproject/providers';
+import { SubgraphPoolBase } from '@/index';
+import { formatFixed } from '@ethersproject/bignumber';
+
+const abi = [
+  'function getSwapFeePercentage() view returns (uint256)',
+  'function percentFee() view returns (uint256)',
+  'function protocolPercentFee() view returns (uint256)',
+  'function getNormalizedWeights() view returns (uint256[])',
+  'function totalSupply() view returns (uint256)',
+  'function getVirtualSupply() view returns (uint256)',
+  'function getActualSupply() view returns (uint256)',
+  'function getTargets() view returns (uint256 lowerTarget, uint256 upperTarget)',
+  'function getTokenRates() view returns (uint256, uint256)',
+  'function getWrappedTokenRate() view returns (uint256)',
+  'function getAmplificationParameter() view returns (uint256 value, bool isUpdating, uint256 precision)',
+  'function getPausedState() view returns (bool)',
+  'function inRecoveryMode() view returns (bool)',
+  'function getRate() view returns (uint256)',
+  'function getScalingFactors() view returns (uint256[] memory)', // do we need this here?
+  'function getPoolTokens(bytes32) view returns (address[], uint256[])',
+];
+
+const getTotalSupplyFn = (poolType: string) => {
+  if (poolType.includes('Linear') || ['StablePhantom'].includes(poolType)) {
+    return 'getVirtualSupply';
+  } else if (poolType === 'ComposableStable') {
+    return 'getActualSupply';
+  } else {
+    return 'totalSupply';
+  }
+};
+
+const getSwapFeeFn = (poolType: string) => {
+  if (poolType === 'Element') {
+    return 'percentFee';
+  } else if (poolType === 'FX') {
+    return 'protocolPercentFee';
+  } else {
+    return 'getSwapFeePercentage';
+  }
+};
+
+const vaultAddress = '0xBA12222222228d8Ba445958a75a0704d566BF2C8';
+
+interface OnchainData {
+  poolTokens: [string[], string[]];
+  totalShares: string;
+  swapFee: string;
+  isPaused?: boolean;
+  inRecoveryMode?: boolean;
+  rate?: string;
+  scalingFactors?: string[];
+  weights?: string[];
+  targets?: [string, string];
+  wrappedTokenRate?: string;
+  amp?: [string, boolean, string];
+  tokenRates?: [string, string];
+}
+
+const defaultCalls = (
+  id: string,
+  address: string,
+  poolType: string,
+  multicaller: Multicaller3
+) => {
+  multicaller.call(`${id}.poolTokens`, vaultAddress, 'getPoolTokens', [id]);
+  multicaller.call(`${id}.totalShares`, address, getTotalSupplyFn(poolType));
+  multicaller.call(`${id}.swapFee`, address, getSwapFeeFn(poolType));
+  // multicaller.call(`${id}.isPaused`, address, 'getPausedState');
+  // multicaller.call(`${id}.inRecoveryMode`, address, 'inRecoveryMode');
+  // multicaller.call(`${id}.rate`, address, 'getRate');
+  // multicaller.call(`${id}.scalingFactors`, address, 'getScalingFactors');
+};
+
+const weightedCalls = (
+  id: string,
+  address: string,
+  multicaller: Multicaller3
+) => {
+  multicaller.call(`${id}.weights`, address, 'getNormalizedWeights');
+};
+
+const linearCalls = (
+  id: string,
+  address: string,
+  multicaller: Multicaller3
+) => {
+  multicaller.call(`${id}.targets`, address, 'getTargets');
+  multicaller.call(`${id}.wrappedTokenRate`, address, 'getWrappedTokenRate');
+};
+
+const stableCalls = (
+  id: string,
+  address: string,
+  multicaller: Multicaller3
+) => {
+  multicaller.call(`${id}.amp`, address, 'getAmplificationParameter');
+};
+
+const gyroECalls = (id: string, address: string, multicaller: Multicaller3) => {
+  multicaller.call(`${id}.tokenRates`, address, 'getTokenRates');
+};
+
+const poolTypeCalls = (poolType: string) => {
+  switch (poolType) {
+    case 'Weighted':
+    case 'LiquidityBootstrapping':
+    case 'Investment':
+      return weightedCalls;
+    case 'Stable':
+    case 'StablePhantom':
+    case 'MetaStable':
+    case 'ComposableStable':
+      return stableCalls;
+    case 'GyroE':
+      return gyroECalls;
+    default:
+      if (poolType.includes('Linear')) {
+        return linearCalls;
+      } else {
+        return () => ({}); // do nothing
+      }
+  }
+};
+
+const merge = (pool: SubgraphPoolBase, result: OnchainData) => ({
+  ...pool,
+  tokens: pool.tokens.map((token) => {
+    const idx = result.poolTokens[0]
+      .map((t) => t.toLowerCase())
+      .indexOf(token.address);
+    const wrappedToken =
+      pool.wrappedIndex && pool.tokensList[pool.wrappedIndex];
+    return {
+      ...token,
+      balance: formatFixed(result.poolTokens[1][idx], token.decimals || 18),
+      weight:
+        (result.weights && formatFixed(result.weights[idx], 18)) ||
+        token.weight,
+      priceRate:
+        (result.wrappedTokenRate &&
+          wrappedToken &&
+          wrappedToken.toLowerCase() === token.address.toLowerCase() &&
+          formatFixed(result.wrappedTokenRate, 18)) ||
+        token.priceRate ||
+        '0',
+    };
+  }),
+  totalShares: formatFixed(result.totalShares, 18),
+  swapFee: formatFixed(result.swapFee, 18),
+  amp:
+    (result.amp &&
+      result.amp[0] &&
+      formatFixed(result.amp[0], String(result.amp[2]).length - 1)) ||
+    undefined,
+  lowerTarget:
+    (result.targets && formatFixed(result.targets[0], 18)) || undefined,
+  upperTarget:
+    (result.targets && formatFixed(result.targets[1], 18)) || undefined,
+  tokenRates:
+    (result.tokenRates &&
+      result.tokenRates.map((rate) => formatFixed(rate, 18))) ||
+    undefined,
+  // rate: result.rate,
+  // isPaused: result.isPaused,
+  // inRecoveryMode: result.inRecoveryMode,
+  // scalingFactors: result.scalingFactors,
+});
+
+export const fetchOnChainPoolData = async (
+  pools: {
+    id: string;
+    address: string;
+    poolType: string;
+  }[],
+  provider: Provider
+): Promise<{ [id: string]: OnchainData }> => {
+  if (pools.length === 0) {
+    return {};
+  }
+
+  const multicaller = new Multicaller3(abi, provider);
+
+  pools.forEach(({ id, address, poolType }) => {
+    defaultCalls(id, address, poolType, multicaller);
+    poolTypeCalls(poolType)(id, address, multicaller);
+  });
+
+  const results = (await multicaller.execute({}, 100)) as {
+    [id: string]: OnchainData;
+  };
+
+  return results;
+};
+
+export async function getOnChainBalances(
+  subgraphPoolsOriginal: SubgraphPoolBase[],
+  _multiAddress: string,
+  _vaultAddress: string,
+  provider: Provider
+): Promise<SubgraphPoolBase[]> {
+  if (subgraphPoolsOriginal.length === 0) return subgraphPoolsOriginal;
+
+  const poolsWithOnchainData: SubgraphPoolBase[] = [];
+
+  const onchainData = (await fetchOnChainPoolData(
+    subgraphPoolsOriginal,
+    provider
+  )) as { [id: string]: OnchainData };
+
+  subgraphPoolsOriginal.forEach((pool) => {
+    const data = onchainData[pool.id];
+    poolsWithOnchainData.push(merge(pool, data));
+  });
+
+  return poolsWithOnchainData;
+}
diff --git a/balancer-js/src/modules/sor/pool-data/subgraphPoolDataService.ts b/balancer-js/src/modules/sor/pool-data/subgraphPoolDataService.ts
index 86dbcef33..94c0b1af7 100644
--- a/balancer-js/src/modules/sor/pool-data/subgraphPoolDataService.ts
+++ b/balancer-js/src/modules/sor/pool-data/subgraphPoolDataService.ts
@@ -6,7 +6,7 @@ import {
   SubgraphClient,
 } from '@/modules/subgraph/subgraph';
 import { parseInt } from 'lodash';
-import { getOnChainBalances } from './onChainData';
+import { getOnChainBalances } from './onChainData3';
 import { Provider } from '@ethersproject/providers';
 import {
   BalancerNetworkConfig,