Prepare contracts for deployment

contracts/WstETHApi3ReaderProxyV1.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.27;
+
+import "@api3/contracts/interfaces/IApi3ReaderProxy.sol";
+import "./interfaces/IWstETH.sol";
+
+/// @title An immutable proxy contract that reads the stETH per wstETH ratio
+/// directly from the WstETH contract on Ethereum.
+/// @dev This contract implements only the IApi3ReaderProxy interface and not the
+/// AggregatorV2V3Interface which is usually implemented by Api3 proxies. The
+/// user of this contract needs to be aware of this limitation and only use this
+/// contract where the IApi3ReaderProxy interface is expected.
+contract WstETHApi3ReaderProxyV1 is IApi3ReaderProxy {
+    /// @notice The address of the wstETH contract on Ethereum mainnet.
+    address public constant WST_ETH =
+        0x7f39C581F595B53c5cb19bD0b3f8dA6c935E2Ca0;
+
+    /// @inheritdoc IApi3ReaderProxy
+    /// @dev Returns the stETH/wstETH exchange rate with 18 decimals precision.
+    /// The timestamp returned is the current block timestamp.
+    function read()
+        public
+        view
+        override
+        returns (int224 value, uint32 timestamp)
+    {
+        uint256 stEthPerToken = IWstETH(WST_ETH).stEthPerToken();
+
+        value = int224(int256(stEthPerToken)); // stEthPerToken value has 18 decimals.
+        timestamp = uint32(block.timestamp);
+    }
+}

contracts/interfaces/IWstETH.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.27;
+
+/// @title A minimal interface for the wstETH contract on Ethereum
+/// @dev This interface only includes the stEthPerToken function needed to read
+/// the exchange rate between stETH and wstETH.
+interface IWstETH {
+    /// @notice Returns the amount of stETH that corresponds to 1 wstETH
+    /// @return The stETH/wstETH exchange rate with 18 decimals precision
+    function stEthPerToken() external view returns (uint256);
+}

scripts/deploy-morpho.ts

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+import { ethers } from 'ethers';
+
+import { ProductApi3ReaderProxyV1__factory } from '../typechain-types';
+
+const deployPriceFeedProxy = async () => {
+  const provider = new ethers.JsonRpcProvider(process.env.PROVIDER);
+  const signer = new ethers.Wallet(process.env.PK!, provider);
+  const productApi3ReaderProxyV1Factory = new ProductApi3ReaderProxyV1__factory(signer);
+  console.info('Deploying product proxy...');
+  const tx = await productApi3ReaderProxyV1Factory.deploy(
+    '', // TODO: Deploy WstETHApi3ReaderProxyV1.sol
+    '0x37422cC8e1487a0452cc0D0BF75877d86c63c88A' // https://market.api3.org/ethereum/eth-usd/integrate?dappAlias=morpho-wsteth-usdc-860-lltv
+  );
+  const productApi3ReaderProxyV1 = await tx.waitForDeployment();
+  console.info('Deployed ProductApi3ReaderProxyV1:', await productApi3ReaderProxyV1.getAddress());
+  console.info('ProductApi3ReaderProxyV1.read():', await productApi3ReaderProxyV1.read());
+  // Deployed on Base: 0x707991d5533021021cC360dF093f1B396340Ef3E
+};
+
+deployPriceFeedProxy();
+
+// NOTE: https://market.api3.org/ethereum/usdc-usd/integrate?dappAlias=morpho-wsteth-usdc-860-lltv