# stUsdc ## Overview Staked USDC is an rebasing auto-compounding LST for Circle's USDC and Bloom TBYs. The interface below is only available for the Arbitrum deployment of the protocol. ## Contract API ### `depositTby` ```solidity function depositTby(uint256 id, uint256 amount) external returns (uint256 amountMinted); ``` Deposit a specified `amount` of `TBY`s to mint `stUsdc`. ### `depositAsset` ```solidity function depositAsset(uint256 amount) external returns (uint256 amountMinted); ``` Deposit a specified `amount` of `underlyingToken` to mint `stUsdc`. ### `redeemStUsdc` ```solidity function redeemStUsdc(uint256 amount) external returns (uint256 underlyingAmount); ``` Redeem `stUsdc` in exchange for `underlyingTokens` ### `poke` ```solidity function poke(LzSettings calldata settings) external; ``` Invokes the auto stake feature as well as updates the value accrual. ### `wstUsdc` ```solidity function wstUsdc() external view returns (IWstUsdc); ``` Returns the `wstUsdc` contract instance. ### `asset` ```solidity function asset() external view returns (IERC20); ``` Returns the `underlyingToken` contract instance. ### `stakeUpStaking` ```solidity function stakeUpStaking() external view returns (IStakeUpStaking); ``` Returns the `StakeUpStaking` contract instance. ### `performanceBps` ```solidity function performanceBps() external view returns (uint256); ``` Returns the performance Bps variable. ### `lastRedeemedTbyId` ```solidity function lastRedeemedTbyId() external view returns (uint256); ``` Returns the last redeemed `tbyId`. ### `globalShares` ```solidity function globalShares() external view returns (uint256); ``` The total shares of `stUSDC` tokens in circulation on all chains. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.stakeup.finance/technical-docs/smart-contracts/tokens/stusdc.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.