diff --git a/clients/js/README.md b/clients/js/README.md
index 93cfa8622..51e3ea95d 100644
--- a/clients/js/README.md
+++ b/clients/js/README.md
@@ -161,6 +161,9 @@ $ worm evm info -c bsc -n mainnet -m TokenBridge
     "moonbeam": "0x0000000000000000000000000000000000000000000000000000000000000000",
     "neon": "0x0000000000000000000000000000000000000000000000000000000000000000",
     "terra2": "0xa463ad028fb79679cfc8ce1efba35ac0e77b35080a1abe9bebe83461f176b0a3",
+    "arbitrum": "0x0000000000000000000000000000000000000000000000000000000000000000",
+    "optimism": "0x0000000000000000000000000000000000000000000000000000000000000000",
+    "gnosis": "0x0000000000000000000000000000000000000000000000000000000000000000",
     "ropsten": "0x0000000000000000000000000000000000000000000000000000000000000000"
   }
 }
diff --git a/clients/js/main.ts b/clients/js/main.ts
index e117dab68..e085c1d71 100644
--- a/clients/js/main.ts
+++ b/clients/js/main.ts
@@ -521,6 +521,12 @@ yargs(hideBin(process.argv))
         throw Error("SUI is not supported yet");
       } else if (chain === "aptos") {
         throw Error("APTOS is not supported yet");
+      } else if (chain === "arbitrum") {
+        throw Error("ARBITRUM is not supported yet");
+      } else if (chain === "optimism") {
+        throw Error("OPTIMISM is not supported yet");
+      } else if (chain === "gnosis") {
+        throw Error("GNOSIS is not supported yet");                        
       } else {
         // If you get a type error here, hover over `chain`'s type and it tells you
         // which cases are not handled
@@ -559,6 +565,12 @@ function parseAddress(chain: ChainName, address: string): string {
     throw Error("SUI is not supported yet")
   } else if (chain === "aptos") {
     throw Error("APTOS is not supported yet")
+  } else if (chain === "arbitrum") {
+    throw Error("ARBITRUM is not supported yet")
+  } else if (chain === "optimism") {
+    throw Error("OPTIMISM is not supported yet")
+  } else if (chain === "gnosis") {
+    throw Error("GNOSIS is not supported yet")            
   } else {
     impossible(chain)
   }
diff --git a/clients/js/networks.ts b/clients/js/networks.ts
index 034a2b7c6..a41afd262 100644
--- a/clients/js/networks.ts
+++ b/clients/js/networks.ts
@@ -111,6 +111,18 @@ const MAINNET = {
     chain_id: "phoenix-1",
     key: get_env_var("TERRA_MNEMONIC"),
   },
+  arbitrum: {
+    rpc: undefined,
+    key: undefined,
+  },
+  optimism: {
+    rpc: undefined,
+    key: undefined,
+  },
+  gnosis: {
+    rpc: undefined,
+    key: undefined,
+  },
   ropsten: {
     rpc: `https://rpc.ankr.com/eth_ropsten`,
     key: get_env_var("ETH_KEY"),
@@ -212,6 +224,18 @@ const TESTNET = {
     chain_id: "pisco-1",
     key: get_env_var("TERRA_MNEMONIC"),
   },
+  arbitrum: {
+    rpc: undefined,
+    key: undefined,
+  },
+  optimism: {
+    rpc: undefined,
+    key: undefined,
+  },
+  gnosis: {
+    rpc: undefined,
+    key: undefined,
+  },
   ropsten: {
     rpc: `https://rpc.ankr.com/eth_ropsten`,
     key: get_env_var("ETH_KEY_TESTNET"),
@@ -313,6 +337,18 @@ const DEVNET = {
     chain_id: "phoenix-1",
     key: "notice oak worry limit wrap speak medal online prefer cluster roof addict wrist behave treat actual wasp year salad speed social layer crew genius",
   },
+  arbitrum: {
+    rpc: undefined,
+    key: undefined,
+  },
+  optimism: {
+    rpc: undefined,
+    key: undefined,
+  },
+  gnosis: {
+    rpc: undefined,
+    key: undefined,
+  },
   ropsten: {
     rpc: undefined,
     key: "0x4f3edf983ac636a65a842ce7c78d9aa706d3b113bce9c46f30d7d21715b23b1d",
diff --git a/proto/publicrpc/v1/publicrpc.proto b/proto/publicrpc/v1/publicrpc.proto
index 3c3117ffd..86d2ef1c1 100644
--- a/proto/publicrpc/v1/publicrpc.proto
+++ b/proto/publicrpc/v1/publicrpc.proto
@@ -31,6 +31,9 @@ enum ChainID {
   CHAIN_ID_OSMOSIS = 20;
   CHAIN_ID_SUI = 21;
   CHAIN_ID_APTOS = 22;
+  CHAIN_ID_ARBITRUM = 23;
+  CHAIN_ID_OPTIMISM = 24;
+  CHAIN_ID_GNOSIS = 25;
   // Special case - Eth has two testnets. CHAIN_ID_ETHEREUM is Goerli,
   // but we also want to connect to Ropsten, so we add a separate chain.
   CHAIN_ID_ETHEREUM_ROPSTEN = 10001;
diff --git a/sdk/js/CHANGELOG.md b/sdk/js/CHANGELOG.md
index 0d1711224..a7736983e 100644
--- a/sdk/js/CHANGELOG.md
+++ b/sdk/js/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## 0.5.2
+
+### Changed
+
+Added chain ids for Arbitrum, Optimism, and Gnosis
+
 ## 0.5.1
 
 ### Changed
diff --git a/sdk/js/src/utils/consts.ts b/sdk/js/src/utils/consts.ts
index 8e48dcead..76183516f 100644
--- a/sdk/js/src/utils/consts.ts
+++ b/sdk/js/src/utils/consts.ts
@@ -22,6 +22,9 @@ export const CHAINS = {
   osmosis: 20,
   sui: 21,
   aptos: 22,
+  arbitrum: 23,
+  optimism: 24,
+  gnosis: 25,
   ropsten: 10001,
 } as const;
 
@@ -46,6 +49,9 @@ export type EVMChainName =
   | "celo"
   | "moonbeam"
   | "neon"
+  | "arbitrum"
+  | "optimism"
+  | "gnosis"
   | "ropsten";
 
 export type TerraChainName = "terra" | "terra2";
@@ -177,6 +183,21 @@ const MAINNET = {
       "terra153366q50k7t8nn7gec00hg66crnhkdggpgdtaxltaq6xrutkkz3s992fw9",
     nft_bridge: undefined,
   },
+  arbitrum: {
+    core: undefined,
+    token_bridge: undefined,
+    nft_bridge: undefined,
+  },
+  optimism: {
+    core: undefined,
+    token_bridge: undefined,
+    nft_bridge: undefined,
+  },
+  gnosis: {
+    core: undefined,
+    token_bridge: undefined,
+    nft_bridge: undefined,
+  },
   ropsten: {
     core: undefined,
     token_bridge: undefined,
@@ -301,6 +322,21 @@ const TESTNET = {
       "terra1c02vds4uhgtrmcw7ldlg75zumdqxr8hwf7npseuf2h58jzhpgjxsgmwkvk",
     nft_bridge: undefined,
   },
+  arbitrum: {
+    core: undefined,
+    token_bridge: undefined,
+    nft_bridge: undefined,
+  },
+  optimism: {
+    core: undefined,
+    token_bridge: undefined,
+    nft_bridge: undefined,
+  },
+  gnosis: {
+    core: undefined,
+    token_bridge: undefined,
+    nft_bridge: undefined,
+  },
   ropsten: {
     core: "0x210c5F5e2AF958B4defFe715Dc621b7a3BA888c5",
     token_bridge: "0xF174F9A837536C449321df1Ca093Bb96948D5386",
@@ -424,6 +460,21 @@ const DEVNET = {
     token_bridge: undefined,
     nft_bridge: undefined,
   },
+  arbitrum: {
+    core: undefined,
+    token_bridge: undefined,
+    nft_bridge: undefined,
+  },
+  optimism: {
+    core: undefined,
+    token_bridge: undefined,
+    nft_bridge: undefined,
+  },
+  gnosis: {
+    core: undefined,
+    token_bridge: undefined,
+    nft_bridge: undefined,
+  },
   ropsten: {
     core: undefined,
     token_bridge: undefined,
@@ -492,6 +543,9 @@ export const CHAIN_ID_INJECTIVE = CHAINS["injective"];
 export const CHAIN_ID_OSMOSIS = CHAINS["osmosis"];
 export const CHAIN_ID_SUI = CHAINS["sui"];
 export const CHAIN_ID_APTOS = CHAINS["aptos"];
+export const CHAIN_ID_ARBITRUM = CHAINS["arbitrum"];
+export const CHAIN_ID_OPTIMISM = CHAINS["optimism"];
+export const CHAIN_ID_GNOSIS = CHAINS["gnosis"];
 export const CHAIN_ID_ETHEREUM_ROPSTEN = CHAINS["ropsten"];
 
 // This inverts the [[CHAINS]] object so that we can look up a chain by id
@@ -603,6 +657,9 @@ export function isEVMChain(
     chainId === CHAIN_ID_CELO ||
     chainId === CHAIN_ID_MOONBEAM ||
     chainId === CHAIN_ID_NEON ||
+    chainId === CHAIN_ID_ARBITRUM ||
+    chainId === CHAIN_ID_OPTIMISM ||
+    chainId === CHAIN_ID_GNOSIS ||
     chainId === CHAIN_ID_ETHEREUM_ROPSTEN
   ) {
     return isEVM(chainId);