# SolvBTC Based Oracle on EVM

<figure><img src="/files/USQJscez9SLMJSYNUS03" alt=""><figcaption></figcaption></figure>

## SolvBTC LST Function related to the Oracle

#### Code URL

{% embed url="<https://github.com/solv-finance/SolvBTC/blob/main/contracts/SolvBTCYieldToken.sol>" %}

### Values based on shares

```solidity
/**
 * @notice Get amount of underlying asset for a given amount of shares.
 */
    function getValueByShares(uint256 shares) external view returns (uint256 value);
```

### Decimals of values

```solidity
/**
 * @notice Get the decimals of the values.
 */
function getOracleDecimals() external view returns (uint8);
```

### Contract address of LST Oracle

```solidity
/**
 * @notice Get the address of LST Oracle.
 */
function getOracle() public view returns (address);
```

## LST Oracle Contract

#### Code URL

{% embed url="<https://github.com/solv-finance/SolvBTC/blob/main/contracts/oracle/SolvBTCYieldTokenOracleForSFT.sol>" %}

### Get Nav

```solidity
function getNav(address erc20) external view returns (uint256);
```

### Nav Decimals

```solidity
function navDecimals(address erc20) external view returns (uint8);
```

## Pool Nav Oracle

#### Code URL

{% embed url="<https://github.com/solv-finance-dev/solv-contracts-v3/blob/main/markets/open-fund-market/contracts/oracle/NavOracle.sol>" %}

### Get Nav

```solidity
function getSubscribeNav(bytes32 poolId_, uint256 time_) 
    external view returns (uint256 nav_, uint256 navTime_);
```

### Set Nav

```solidity
function setSubscribeNavOnlyMarket(bytes32 poolId_, uint256 time_, uint256 nav_) external;
```


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