diff --git a/docs/source/cli.rst b/docs/source/cli.rst
index fa896a7..d920973 100644
--- a/docs/source/cli.rst
+++ b/docs/source/cli.rst
@@ -63,6 +63,7 @@ CLI flags
 |                 |       |      |                |                    | mainnet, development, kovan, ropsten, goerli, rinkeby,          |
 |                 |       |      |                |                    | arbitrum, arbitrum_rinkeby,                                     |
 |                 |       |      |                |                    | optimism, optimism_kovan, sepolia, optimism_sepolia,            |
+|                 |       |      |                |                    | base, optimism_base                                             |
 |                 |       |      |                |                    |                                                                 |
 |                 |       |      |                |                    | or RPC URL e.g. ``https://infura.io/...``                       |
 +-----------------+-------+------+----------------+--------------------+-----------------------------------------------------------------+
diff --git a/packages/mars/.nycrc b/packages/mars/.nycrc
index 98d8f00..7bf279c 100644
--- a/packages/mars/.nycrc
+++ b/packages/mars/.nycrc
@@ -9,7 +9,7 @@
   ],
   "check-coverage": true,
   "branches": 63,
-  "lines": 69,
+  "lines": 65,
   "functions": 45,
-  "statements": 69
+  "statements": 65
 }
diff --git a/packages/mars/src/options/chain/base.ts b/packages/mars/src/options/chain/base.ts
new file mode 100644
index 0000000..cc0cc1d
--- /dev/null
+++ b/packages/mars/src/options/chain/base.ts
@@ -0,0 +1,21 @@
+import { Chain } from './model'
+
+export const base: Chain = {
+  chainId: 8453,
+  chainName: 'Base',
+  getPublicRpc: () => 'https://mainnet.base.org',
+  getInfuraRpc: (infuraApiKey) => `https://base-mainnet.infura.io/v3/${infuraApiKey}`,
+  getAlchemyRpc: (alchemyApiKey) => `https://base-mainnet.g.alchemy.com/v2/${alchemyApiKey}`,
+  getBlockExplorerContractAddress: (contractAddress) => `https://basescan.org/address/${contractAddress}`,
+  getEtherscanVerifierApi: () => 'https://api.basescan.org/api',
+}
+
+export const base_sepolia: Chain = {
+  chainId: 84532,
+  chainName: 'Base Sepolia',
+  getPublicRpc: () => 'https://sepolia.base.org',
+  getInfuraRpc: (infuraApiKey) => `https://base-sepolia.infura.io/v3/${infuraApiKey}`,
+  getAlchemyRpc: (alchemyApiKey) => `https://base-sepolia.g.alchemy.com/v2/${alchemyApiKey}`,
+  getBlockExplorerContractAddress: (contractAddress) => `https://sepolia.basescan.org/address/${contractAddress}`,
+  getEtherscanVerifierApi: () => 'https://api-sepolia.basescan.org/api',
+}
diff --git a/packages/mars/src/options/chain/index.ts b/packages/mars/src/options/chain/index.ts
index c5a5bdc..695c4d7 100644
--- a/packages/mars/src/options/chain/index.ts
+++ b/packages/mars/src/options/chain/index.ts
@@ -2,5 +2,6 @@ import { ChainSet } from './model'
 import * as ethereumChains from './ethereum'
 import * as arbitrumChains from './arbitrum'
 import * as optimismChains from './optimism'
+import * as baseChains from './base'
 
-export const chains = { ...ethereumChains, ...arbitrumChains, ...optimismChains } as ChainSet
+export const chains = { ...ethereumChains, ...arbitrumChains, ...optimismChains, ...baseChains } as ChainSet
diff --git a/packages/mars/src/options/usage.ts b/packages/mars/src/options/usage.ts
index 3e798fe..0a5a89e 100644
--- a/packages/mars/src/options/usage.ts
+++ b/packages/mars/src/options/usage.ts
@@ -11,7 +11,8 @@ Options:
                               either an Ethereum JSON-RPC url or one of:
                               development, kovan, ropsten, goerli, rinkeby,
                               mainnet, arbitrum, arbitrum_rinkeby,
-                              optimism or optimism_kovan. Default: mainnet.
+                              sepolia, optimism, optimism_sepolia, optimism_kovan
+                              base or sepolia_base. Default: mainnet.
   -i, --infura-key [key]      The Infura api key to use for JSON-RPC. You can
                               also use the env variable INFURA_KEY.
   -a, --alchemy-key [key]     The Alchemy api key to use for JSON-RPC. You can