diff --git a/deployments/base-sepolia/weth/migrations/1711572958_initialize_market.ts b/deployments/base-sepolia/weth/migrations/1711572958_initialize_market.ts
new file mode 100644
index 000000000..c65649987
--- /dev/null
+++ b/deployments/base-sepolia/weth/migrations/1711572958_initialize_market.ts
@@ -0,0 +1,104 @@
+import { DeploymentManager } from '../../../../plugins/deployment_manager/DeploymentManager';
+import { migration } from '../../../../plugins/deployment_manager/Migration';
+import { calldata, exp, getConfigurationStruct, proposal } from '../../../../src/deploy';
+
+const baseSepoliaCOMPAddress = '0x2f535da74048c0874400f0371Fba20DF983A56e2';
+
+export default migration('1711572958_initialize_market', {
+  prepare: async (deploymentManager: DeploymentManager) => {
+    return {};
+  },
+
+  enact: async (deploymentManager: DeploymentManager, govDeploymentManager: DeploymentManager, vars: Vars) => {
+    const trace = deploymentManager.tracer();
+    const ethers = deploymentManager.hre.ethers;
+    const { utils } = ethers;
+
+    const {
+      bridgeReceiver,
+      comet,
+      cometAdmin,
+      rewards,
+      configurator,
+    } = await deploymentManager.getContracts();
+
+    const {
+      baseL1CrossDomainMessenger,
+      governor,
+    } = await govDeploymentManager.getContracts();
+
+    const configuration = await getConfigurationStruct(deploymentManager);
+
+    const setConfigurationCalldata = await calldata(
+      configurator.populateTransaction.setConfiguration(comet.address, configuration)
+    );
+    const deployAndUpgradeToCalldata = utils.defaultAbiCoder.encode(
+      ['address', 'address'],
+      [configurator.address, comet.address]
+    );
+    const setRewardConfigCalldata = utils.defaultAbiCoder.encode(
+      ['address', 'address'],
+      [comet.address, baseSepoliaCOMPAddress]
+    );
+    const l2ProposalData = utils.defaultAbiCoder.encode(
+      ['address[]', 'uint256[]', 'string[]', 'bytes[]'],
+      [
+        [ configurator.address, cometAdmin.address, rewards.address ],
+        [ 0, 0, 0 ],
+        [
+          'setConfiguration(address,(address,address,address,address,address,uint64,uint64,uint64,uint64,uint64,uint64,uint64,uint64,uint64,uint64,uint64,uint64,uint104,uint104,uint104,(address,address,uint8,uint64,uint64,uint64,uint128)[]))',
+          'deployAndUpgradeTo(address,address)',
+          'setRewardConfig(address,address)',
+        ],
+        [
+          setConfigurationCalldata,
+          deployAndUpgradeToCalldata,
+          setRewardConfigCalldata
+        ]
+      ]
+    );
+
+    const sepoliaActions = [
+      // 1. Set Comet configuration, deployAndUpgradeTo new Comet, set reward config
+      {
+        contract: baseL1CrossDomainMessenger,
+        signature: 'sendMessage(address,bytes,uint32)',
+        args: [ bridgeReceiver.address, l2ProposalData, 2_500_000 ]
+      },
+    ];
+
+    const description = "# Configure Base-Sepolia cWETHv3 market, set rewards config.";
+    const txn = await govDeploymentManager.retry(async () =>
+      trace(await governor.propose(...(await proposal(sepoliaActions, description))))
+    );
+
+    const event = txn.events.find(event => event.event === 'ProposalCreated');
+    const [proposalId] = event.args;
+
+    trace(`Created proposal ${proposalId}.`);
+  },
+
+  async verify(deploymentManager: DeploymentManager, govDeploymentManager: DeploymentManager, preMigrationBlockNumber: number) {
+    const ethers = deploymentManager.hre.ethers;
+    await deploymentManager.spider(); // We spider here to pull in Optimism COMP now that reward config has been set
+
+    const {
+      comet,
+      rewards,
+      COMP,
+    } = await deploymentManager.getContracts();
+
+    // 1.
+    const stateChanges = await diffState(comet, getCometConfig, preMigrationBlockNumber);
+
+    expect(stateChanges).to.deep.equal({
+      pauseGuardian: '0x6106DA3AcFdEB341808f4DC3D2483eC67c98E728',
+      baseTrackingSupplySpeed: exp(2 / 86400, 16, 18),
+      baseTrackingBorrowSpeed: exp(2 / 86400, 16, 18),
+      baseBorrowMin: exp(100, 18),
+      cbETH: {
+        supplyCap: exp(7500, 18)
+      },
+    });
+  }
+});
\ No newline at end of file
diff --git a/deployments/sepolia/weth/relations.ts b/deployments/sepolia/weth/relations.ts
index 13f315c2a..ae12a73a5 100644
--- a/deployments/sepolia/weth/relations.ts
+++ b/deployments/sepolia/weth/relations.ts
@@ -10,4 +10,11 @@ export default {
       }
     }
   },
+  baseL1CrossDomainMessenger: {
+    artifact: 'contracts/bridges/optimism/IL1CrossDomainMessenger.sol:IL1CrossDomainMessenger',
+    delegates: {
+      // Not great, but this address shouldn't change and is very difficult to grab on-chain (private methods)
+      field: async () => '0xC34855F4De64F1840e5686e64278da901e261f20'
+    }
+  },
 };
diff --git a/deployments/sepolia/weth/roots.json b/deployments/sepolia/weth/roots.json
index 825b5a431..851851976 100644
--- a/deployments/sepolia/weth/roots.json
+++ b/deployments/sepolia/weth/roots.json
@@ -1,7 +1,9 @@
 {
-    "comet": "0x2943ac1216979aD8dB76D9147F64E61adc126e96",
-    "configurator": "0xc28aD44975C614EaBe0Ed090207314549e1c6624",
-    "rewards": "0x8bF5b658bdF0388E8b482ED51B14aef58f90abfD",
-    "bulker": "0xaD0C044425D81a2E223f4CE699156900fead2Aaa",
-    "fauceteer": "0x68793eA49297eB75DFB4610B68e076D2A5c7646C"
+  "comet": "0x2943ac1216979aD8dB76D9147F64E61adc126e96",
+  "configurator": "0xc28aD44975C614EaBe0Ed090207314549e1c6624",
+  "rewards": "0x8bF5b658bdF0388E8b482ED51B14aef58f90abfD",
+  "bulker": "0xaD0C044425D81a2E223f4CE699156900fead2Aaa",
+  "fauceteer": "0x68793eA49297eB75DFB4610B68e076D2A5c7646C",
+  "baseL1CrossDomainMessenger": "0xC34855F4De64F1840e5686e64278da901e261f20",
+  "baseL1StandardBridge": "0xfd0Bf71F60660E2f608ed56e1659C450eB113120"
 }
\ No newline at end of file