lido

Call the Lido contract's `submit(address _referral)` function as a payable transaction with your ETH amount, passing address(0) if you have no referral. Check `getCurrentStakeLimit()` first for large deposits, since a daily staking limit can cause STAKE_LIMIT reverts.

stETH is a rebasing token whose balance increases daily with staking rewards, while wstETH is a non-rebasing wrapper representing a fixed number of stETH shares. One wstETH is worth more than one stETH, and the rate drifts upward; convert using `stEthPerToken()` or `getStETHByWstETH()`.

Use wstETH for collateral, vaults, and any contract that stores balances, because rebasing breaks standard ERC-20 accounting. If you must hold stETH, track shares via `sharesOf()` and `getPooledEthByShares()` instead of `balanceOf()`.

stETH transfers convert amounts to shares and back using integer division, which rounds down twice, so recipients may receive 1-2 wei less than the sent amount. Use `transferShares()` for exact transfers and allow a 2 wei tolerance in balance assertions.

Withdrawals are queued and finalized by the oracle, typically taking 1-5 days but longer under high demand. After `getWithdrawalStatus()` shows isFinalized as true, compute hints with `findCheckpointHints()` and call `claimWithdrawals()` to receive ETH.

Use the Chainlink wstETH/ETH feed at 0x536218f9E9Eb48863970252233c8F271f554C2d0 with an 86400-second staleness check. For critical paths, cross-validate against the on-chain `stEthPerToken()` rate and revert if deviation exceeds a threshold such as 5%.