Oracle POC - RIF Token Price
This Oracle retrieves the RIF token price in USD from an external data source and stores it on a public variable to be consumed by other contracts.
It implements the Provable API 0.5 and the Ownable contract by OpenZeppelin
Usage
RIF token is price stored in public variable rifTokenPriceInMillicents. 1 dollar = 10^5 millicents
To check when the value was last updated, read lastExecutionTimestamp public variable
An example client contract is included to show how the oracle can be consumed from within another contract. Please note this is just an example, it is not intended to be used in Production environments.
Disclaimer and limitations
- RIFUSDOracle queries RIF token price from only one datasource (CoinGecko API).
- Users should always check
lastExecutionTimestampfrom the oracle to know how old the price obtained is. - The oracle updates the RIF token price every minute, but if for any reason it stopped working then the returned price could be outdated.
- Price obtained from the oracle is in millicents (1 dollar = 10^5 millicents).
Use at your own risk
Contract - TESTNET
https://explorer.testnet.rsk.co/address/0x1fe8b8e0c73fea8802b70d7f6d5c637d59a13ddd
- Gas price: 0.06 gwei by default, can be changed by owner calling
setGasPrice(uint price) - Gas limit: 140000 by default, can be changed by owner calling
setCallbackGasLimit(uint gasLimit) - Time between executions: 60 seconds by default, can be changed by owner calling
setSecondsBetweenExecutions(uint seconds) - In case of unreliable behaviour the Oracle can be terminated by owner calling
kill(address payee)