diff --git a/.changeset/strong-queens-invite.md b/.changeset/strong-queens-invite.md
new file mode 100644
index 0000000..e8af0eb
--- /dev/null
+++ b/.changeset/strong-queens-invite.md
@@ -0,0 +1,5 @@
+---
+"@across-protocol/app-sdk": patch
+---
+
+Adds multicall handler contract address definitions
diff --git a/packages/sdk/.eslintrc.json b/packages/sdk/.eslintrc.json
index 6bd7728..92f66c0 100644
--- a/packages/sdk/.eslintrc.json
+++ b/packages/sdk/.eslintrc.json
@@ -7,5 +7,18 @@
   },
   "env": {
     "es2020": true
+  },
+  "rules": {
+    "no-restricted-imports": [
+      "error",
+      {
+        "patterns": [
+          {
+            "group": ["@/*"],
+            "message": "Use relative imports instead of path aliases in library code to avoid compilation issues"
+          }
+        ]
+      }
+    ]
   }
 }
diff --git a/packages/sdk/src/constants/multicall-handler.ts b/packages/sdk/src/constants/multicall-handler.ts
new file mode 100644
index 0000000..819020e
--- /dev/null
+++ b/packages/sdk/src/constants/multicall-handler.ts
@@ -0,0 +1,40 @@
+import { Address } from "viem";
+
+export const multicallHandlerDeployments: Record<number, Address> = {
+  1: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  10: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  56: "0xAC537C12fE8f544D712d71ED4376a502EEa944d7",
+  130: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  137: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  232: "0x1Ed0D59019a52870337b51DEe8190486a8663037",
+  324: "0x68d3806E57148D6c6793C78EbDDbc272fE605dbf",
+  480: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  690: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  919: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  999: "0x5E7840E06fAcCb6d1c3b5F5E0d1d3d07F2829bba",
+  1135: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  1301: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  1868: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  4202: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  8453: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  9745: "0x5E7840E06fAcCb6d1c3b5F5E0d1d3d07F2829bba",
+  34443: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  37111: "0x02D2B95F631E0CF6c203E77f827381B0885F7822",
+  42161: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  57073: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  59144: "0xdF1C940487574EEfa79989a79a4936A0F979cDa2",
+  80002: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  81457: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  84532: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  129399: "0xAC537C12fE8f544D712d71ED4376a502EEa944d7",
+  421614: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  534352: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  808813: "0xAC537C12fE8f544D712d71ED4376a502EEa944d7",
+  7777777: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  11155111: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  11155420: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  168587773: "0x0F7Ae28dE1C8532170AD4ee566B5801485c13a0E",
+  //   TODO: support SVM
+  //   34268394551451: "HaQe51FWtnmaEcuYEfPA7MRCXKrtqptat4oJdJ8zV5Be",
+  //   133268194659241: "Fk1RpqsfeWt8KnFCTW9NQVdVxYvxuqjGn6iPB9wrmM8h",
+};
diff --git a/packages/sdk/src/utils/multicallHandler.ts b/packages/sdk/src/utils/multicallHandler.ts
index 64c739e..d66abd1 100644
--- a/packages/sdk/src/utils/multicallHandler.ts
+++ b/packages/sdk/src/utils/multicallHandler.ts
@@ -1,23 +1,17 @@
 import { Address, encodeAbiParameters, parseAbiParameters } from "viem";
 
 import { CrossChainAction } from "../types/index.js";
+import { multicallHandlerDeployments } from "../constants/multicall-handler.js";
 
 export type BuildMessageParams = {
   fallbackRecipient: Address;
   actions: CrossChainAction[];
 };
 
-export function getMultiCallHandlerAddress(chainId: number) {
-  // @todo: use sdk or API to source addresses?
+export function getMultiCallHandlerAddress(chainId: number): Address {
   const defaultAddress = "0x924a9f036260DdD5808007E1AA95f08eD08aA569";
-  switch (chainId) {
-    case 324:
-      return "0x863859ef502F0Ee9676626ED5B418037252eFeb2";
-    case 59144:
-      return "0x1015c58894961F4F7Dd7D68ba033e28Ed3ee1cDB";
-    default:
-      return defaultAddress;
-  }
+  const deployments = multicallHandlerDeployments;
+  return deployments?.[chainId] ?? defaultAddress;
 }
 
 export function buildMulticallHandlerMessage(params: BuildMessageParams) {