From 060c9adbb7b94d30095f9d2e960543d057dfdd3b Mon Sep 17 00:00:00 2001
From: Aleksa Colovic <aleksa.colovic98@gmail.com>
Date: Thu, 4 Dec 2025 12:26:58 +0100
Subject: [PATCH] feat: Add MegaETH

---
 package.json    |  2 +-
 src/networks.ts | 12 ++++++++++++
 src/tokens.ts   |  9 +++++++++
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/package.json b/package.json
index f2b1462..090e3a6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@across-protocol/constants",
-  "version": "3.1.91",
+  "version": "3.1.92",
   "description": "Export commonly re-used values for Across repositories",
   "repository": "https://github.com/across-protocol/constants.git",
   "author": "hello@umaproject.org",
diff --git a/src/networks.ts b/src/networks.ts
index 0b18381..dee2da7 100644
--- a/src/networks.ts
+++ b/src/networks.ts
@@ -40,6 +40,7 @@ export const MAINNET_CHAIN_IDs = {
   LINEA: 59144,
   LISK: 1135,
   MAINNET: 1,
+  MEGAETH: 4326, // Do we want to go with MEGAETH or MEGA_ETH?
   MODE: 34443,
   MONAD: 143,
   OPTIMISM: 10,
@@ -78,6 +79,7 @@ export const PRODUCTION_OFT_EIDs = {
   HYPEREVM: 30367,
   MAINNET: 30101,
   MONAD: 30390,
+  // @TODO: Add MEGAETH EID
   OPTIMISM: 30111,
   PLASMA: 30383,
   POLYGON: 30109,
@@ -274,6 +276,16 @@ export const PRODUCTION_NETWORKS: { [chainId: number]: PublicNetwork } = {
     oftEid: PRODUCTION_OFT_EIDs.MAINNET,
     hypDomainId: MAINNET_CHAIN_IDs.MAINNET,
   },
+  [CHAIN_IDs.MEGAETH]: {
+    name: "MegaETH",
+    family: OP_STACK,
+    nativeToken: "ETH",
+    publicRPC: "", // @TODO: Add MegaETH RPC
+    blockExplorer: "https://megaeth-testnet-v3.blockscout.com/", // @TODO: Add MegaETH block explorer (this is testnet block explorer)
+    cctpDomain: CCTP_NO_DOMAIN,
+    oftEid: OFT_NO_EID, // @TODO: Add MegaETH EID
+    hypDomainId: MAINNET_CHAIN_IDs.MEGAETH, // @TODO: What is hypDomainId?
+  },
   [CHAIN_IDs.MODE]: {
     name: "Mode",
     family: OP_STACK,
diff --git a/src/tokens.ts b/src/tokens.ts
index 87c48fc..d80ecf7 100644
--- a/src/tokens.ts
+++ b/src/tokens.ts
@@ -467,6 +467,14 @@ export const TOKEN_SYMBOLS_MAP = {
     },
     coingeckoId: "usdh-2",
   },
+  USDM: {
+    name: "MegaUSD",
+    symbol: "USDM",
+    decimals: 18,
+    addresses: {
+      [CHAIN_IDs.MEGAETH]: "0x6651573521BD0852e570ac7D1f530aC022279507" // @TODO: This is testnet address, change with mainnet
+    }
+  },
   USDT: {
     name: "Tether USD",
     symbol: "USDT",
@@ -480,6 +488,7 @@ export const TOKEN_SYMBOLS_MAP = {
       [CHAIN_IDs.LINEA]: "0xA219439258ca9da29E9Cc4cE5596924745e12B93",
       [CHAIN_IDs.LISK]: "0x05D032ac25d322df992303dCa074EE7392C117b9",
       [CHAIN_IDs.MAINNET]: "0xdAC17F958D2ee523a2206206994597C13D831ec7",
+      [CHAIN_IDs.MEGAETH]: "", // @TODO: Add USDT address
       [CHAIN_IDs.MONAD]: "0xe7cd86e13AC4309349F30B3435a9d337750fC82D",
       [CHAIN_IDs.MONAD_TESTNET]: "0x88b8E2161DEDC77EF4ab7585569D2415a1C1055D",
       [CHAIN_IDs.MODE]: "0xf0F161fDA2712DB8b566946122a5af183995e2eD",