Sei Native Oracle Adapter Library

A library that enables an out-of-the-box utilization of the Sei Native Oracle though the Solidity smart-contracts. The Sei Native Oracle returns 18 decimal fixed point numbers in a string format (which is usually not directly usable), and this library helps you easily retrieve exchange rates in uint256 format with a manageable amount decimals.

Functionalities

getExchangeRates()

• Function that provides the ability to retrieve all available exchange rates converted to uint256 and with maximum precision to the contracts which utilize the adapter.
• Returns: rates[] and denoms[] (denoms is needed in order to map rates to tokens, which enables contextual usage of the retrieved data)

getExchangeRate(string memory denom)

• Function that provides the ability to retrieve an exchange rate converted to uint256 and with maximum precision.
• Denom is computed by appending lowercase character 'u' to the lowercase token symbol (ex. 'usei', 'ueth', 'ubtc').
• In case of an unsupported denom, returned exchange rate will be zero.
• Returns: rate

getOracleTwaps(uint64 lookbackSeconds)

• Function that provides all available time weighed average prices of tokens converted to uint256 and with maximum precision for a chosen timespan.
• Timespan is a time range between block.timestamp and block.timestamp - lookbackSeconds.
• Returns: twaps[] + denoms[] (denoms array helps adapter/oracle consumers use data in context)

getOracleTwap(uint64 lookbackSeconds, string memory denom)

• Function that provides a time weighed average price of a chosen token/denom in a timespan determined by lookbackSeconds.
• Returns: twap

convertBytesNumberToUint256(bytes memory bytesNumber)

• Function that converts a number from fixed point bytes representation (which was previously casted from string representation) to uint256.
• Returns: uint256Number -> converted number

changeDecimals(uint256 number, uint256 fromDecimals, uint256 toDecimals)

• Function that changes decimals on a provided number by either appending zeroes to it or trimming it for a specified number of decimals.
• This function is not directly used in any of the existing flows, but it is made to let consumers manually adapt decimals on need.
• Can utilize the informative ORACLE_PRECISION constant.
• Returns: number -> number with modified decimals

*Rates/Prices are represented in USD value

Usage

Build

$ forge build

Test

$ forge test

License

MIT