diff --git a/packages/hardhat/helper.config.ts b/packages/hardhat/helper.config.ts
index 2bd96737..135aa51b 100644
--- a/packages/hardhat/helper.config.ts
+++ b/packages/hardhat/helper.config.ts
@@ -6,6 +6,15 @@ interface NetworkConfigEntryTypes {
     routerAddr: string;
     batchRouterAddr: string;
   };
+  customPool: {
+    name: string;
+    tokenConfig: {
+      token: string;
+      tokenType: number;
+      rateProvider: string;
+      yieldFeeExempt: boolean;
+    }[];
+  };
 }
 
 // Contracts have constructors that require contract address args that are network specific
@@ -18,6 +27,23 @@ const networkConfig: { [key: number]: NetworkConfigEntryTypes } = {
       routerAddr: "0xA0De078cd5cFa7088821B83e0bD7545ccfb7c883",
       batchRouterAddr: "0x8A8B9f35765899B3a0291700141470D79EA2eA88",
     },
+    customPool: {
+      name: "ConstantPricePool",
+      tokenConfig: [
+        {
+          token: "0xB77EB1A70A96fDAAeB31DB1b42F2b8b5846b2613", // sepoliaDAI
+          tokenType: 0, // STANDARD
+          rateProvider: "0x0000000000000000000000000000000000000000", // https://docs-v3.balancer.fi/reference/contracts/rate-providers.html#none-of-the-assets
+          yieldFeeExempt: false,
+        },
+        {
+          token: "0x80D6d3946ed8A1Da4E226aa21CCdDc32bd127d1A", // sepoliaUSDC
+          tokenType: 0, // STANDARD
+          rateProvider: "0x0000000000000000000000000000000000000000", // https://docs-v3.balancer.fi/reference/contracts/rate-providers.html#none-of-the-assets
+          yieldFeeExempt: false,
+        },
+      ],
+    },
   },
 };
 
diff --git a/packages/hardhat/scripts/initializePool.ts b/packages/hardhat/scripts/initializePool.ts
new file mode 100644
index 00000000..bd1129aa
--- /dev/null
+++ b/packages/hardhat/scripts/initializePool.ts
@@ -0,0 +1,107 @@
+import hre from "hardhat";
+import { networkConfig } from "../helper.config";
+import { Contract } from "ethers";
+
+/**
+ * Initialize a pool that has already been registered on sepolia
+ *
+ * balancer docs
+ * https://docs-v3.balancer.fi/concepts/router/overview.html#initialize
+ *
+ * initialize() function
+ * https://github.com/balancer/balancer-v3-monorepo/blob/2ad8501c85e8afb2f25d970344af700a571b1d0b/pkg/vault/contracts/VaultExtension.sol#L130-L149
+ *
+ */
+
+const routerAbi = [
+  {
+    inputs: [
+      {
+        internalType: "address",
+        name: "pool",
+        type: "address",
+      },
+      {
+        internalType: "address",
+        name: "to",
+        type: "address",
+      },
+      {
+        internalType: "contract IERC20[]",
+        name: "tokens",
+        type: "address[]",
+      },
+      {
+        internalType: "uint256[]",
+        name: "exactAmountsIn",
+        type: "uint256[]",
+      },
+      {
+        internalType: "uint256",
+        name: "minBptAmountOut",
+        type: "uint256",
+      },
+      {
+        internalType: "bytes",
+        name: "userData",
+        type: "bytes",
+      },
+    ],
+    name: "initialize",
+    outputs: [
+      {
+        internalType: "uint256",
+        name: "bptAmountOut",
+        type: "uint256",
+      },
+    ],
+    stateMutability: "nonpayable",
+    type: "function",
+  },
+];
+
+async function main() {
+  const privateKey = process.env.DEPLOYER_PRIVATE_KEY;
+  if (!privateKey) {
+    console.log("🚫️ Please set a PRIVATE_KEY var at packages/hardhat/.env");
+    return;
+  }
+  if (hre.network.name !== "sepolia") {
+    throw new Error("This script is only configured for sepolia network");
+  }
+  const chainId = Number(await hre.ethers.provider.getNetwork().then(network => network.chainId));
+
+  // grab the Router contract
+  const { balancer, customPool } = networkConfig[chainId];
+  const [signer] = await hre.ethers.getSigners();
+  const router = await hre.ethers.getContractAt(routerAbi, balancer.routerAddr, signer);
+
+  /***************************
+   *  args for initialize    *
+   ***************************/
+  // 1. Address of pool to initialize
+  const { target: poolAddress } = await hre.ethers.getContract<Contract>(customPool.name, signer);
+  // 2. Tokens used to seed the pool (must match the registered tokens)
+  const tokens = customPool.tokenConfig.map((token: any) => token.token);
+  // 3. Exact amounts of tokens to be added, sorted in token registration order
+  const exactAmountsIn = [100, 100];
+  // 4. Minimum amount of pool tokens to be received
+  const minBptAmountOut = 0;
+  // 5. If true, incoming ETH will be wrapped to WETH; otherwise the Vault will pull WETH tokens
+  const wethIsEth = false;
+  // 6. Additional (optional) data required for adding initial liquidity
+  const userData = "0x";
+
+  console.log("Sending tx to initialize pool...");
+  const txResponse = await router.initialize(poolAddress, tokens, exactAmountsIn, minBptAmountOut, wethIsEth, userData);
+  console.log(txResponse);
+  console.log("Waiting for tx to be mined...");
+  const txReceipt = await txResponse.wait();
+  console.log("Pool registered!!!");
+  console.log(txReceipt);
+}
+
+main().catch(error => {
+  console.error(error);
+  process.exitCode = 1;
+});
diff --git a/packages/hardhat/scripts/registerPool.ts b/packages/hardhat/scripts/registerPool.ts
index be2c2a02..8b4a18d1 100644
--- a/packages/hardhat/scripts/registerPool.ts
+++ b/packages/hardhat/scripts/registerPool.ts
@@ -26,32 +26,23 @@ async function main() {
   const chainId = Number(await hre.ethers.provider.getNetwork().then(network => network.chainId));
 
   // grab the VaultExtension contract
-  const { vaultExtensionAddr } = networkConfig[chainId].balancer;
+  const { balancer, customPool } = networkConfig[chainId];
   const { abi: vaultExtensionAbi } = await hre.artifacts.readArtifact("IVaultExtension");
   const [signer] = await hre.ethers.getSigners();
-  const vaultExtension = await hre.ethers.getContractAt(vaultExtensionAbi, vaultExtensionAddr, signer);
+  const vaultExtension = await hre.ethers.getContractAt(vaultExtensionAbi, balancer.vaultExtensionAddr, signer);
 
-  // args for registerPool
-  const { target: poolAddress } = await hre.ethers.getContract<Contract>("ConstantPricePool", signer);
-  const tokenConfig = [
-    {
-      token: "0xB77EB1A70A96fDAAeB31DB1b42F2b8b5846b2613", // sepoliaDAI
-      tokenType: 0, // STANDARD
-      rateProvider: "0x0000000000000000000000000000000000000000", // https://docs-v3.balancer.fi/reference/contracts/rate-providers.html#none-of-the-assets
-      yieldFeeExempt: false,
-    },
-    {
-      token: "0x80D6d3946ed8A1Da4E226aa21CCdDc32bd127d1A", // sepoliaUSDC
-      tokenType: 0, // STANDARD
-      rateProvider: "0x0000000000000000000000000000000000000000", // https://docs-v3.balancer.fi/reference/contracts/rate-providers.html#none-of-the-assets
-      yieldFeeExempt: false,
-    },
-  ];
-  // The timestamp after which it is no longer possible to pause the pool
+  /*****************************
+   *  args for registerPool    *
+   *****************************/
+  // 1. Address of pool to register
+  const { target: poolAddress } = await hre.ethers.getContract<Contract>(customPool.name, signer);
+  // 2. An array of descriptors for the tokens the pool will manage.
+  const tokenConfig = customPool.tokenConfig;
+  // 3. The timestamp after which it is no longer possible to pause the pool
   const pauseWindowEndTime = 0;
-  // Optional contract the Vault will allow to pause the pool
+  // 4. Optional contract the Vault will allow to pause the pool
   const pauseManager = hre.ethers.ZeroAddress;
-  // Flags indicating which hooks the pool supports
+  // 5. Flags indicating which hooks the pool supports
   const hookConfig = {
     shouldCallBeforeInitialize: false,
     shouldCallAfterInitialize: false,
@@ -62,6 +53,7 @@ async function main() {
     shouldCallBeforeRemoveLiquidity: false,
     shouldCallAfterRemoveLiquidity: false,
   };
+  // 6. Liquidity management flags with implemented methods
   const liquidityManagement = {
     supportsAddLiquidityCustom: false,
     supportsRemoveLiquidityCustom: false,