> For the complete documentation index, see [llms.txt](https://peridot-finance.gitbook.io/peridot-protocol/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://peridot-finance.gitbook.io/peridot-protocol/technical-architecture/evm/core-contracts/perc20.md).

# PERC20

The **PERC20** contract represents interest-bearing ERC20 tokens users receive when supplying assets to Peridot Protocol.

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### 🛠️ Key Functions & Parameters

#### `mint(uint mintAmount)`

Deposit underlying ERC20 tokens into the protocol to receive PERC20 tokens.

* **Parameters:**
  * `mintAmount`: Amount of underlying asset tokens to deposit.

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#### `redeem(uint redeemTokens)`

Withdraw underlying tokens by redeeming your PERC20 tokens.

* **Parameters:**
  * `redeemTokens`: Amount of PERC20 tokens to redeem.

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#### `redeemUnderlying(uint redeemAmount)`

Withdraw an exact amount of underlying tokens.

* **Parameters:**
  * `redeemAmount`: Exact amount of underlying tokens to redeem.

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#### `borrow(uint borrowAmount)`

Borrows underlying assets from the market.

* **Parameters:**
  * `borrowAmount`: Amount of underlying tokens to borrow.

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#### `repayBorrow(uint repayAmount)`

Repays borrowed tokens to the market.

* **Parameters:**
  * `repayAmount`: Amount of borrowed tokens to repay.

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#### `balanceOfUnderlying(address owner)`

Shows the underlying asset balance for a user (includes interest accrued).

* **Parameters:**
  * `owner`: User's wallet address.
* **Returns:**
  * Current underlying balance including accrued interest.

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### 📈 View Functions & Information

* `exchangeRateCurrent()`: Fetches current exchange rate (PERC20 ↔ underlying).
* `getCash()`: Retrieves total available liquidity of underlying asset.