MoC USD-BTC price provider contract. This is the current implementation of oracle on MoC system, also we are working on a new generation 'OMOC Decentralized Oracle'
This project is based on MakerDao Medianizer and PriceFeed solution.
Reference price (BTCUSD) and (RIFUSD) for MoC/RDoC system is provided via an oracle (the medianizer), which collates price data from a number of external price feeds.
Independent price feed operators constantly monitor the reference price across a number of external sources and will submit updates to the blockchain.
Price updates are written to the blockchain via price feed contracts which are deployed and owned by feed operators. Price feed contracts which have been whitelisted by the medianizer are able to forward their prices for inclusion in the medianized price.
take a look to pricefeed app implementation
The adding and removal of whitelisted price feed addresses is controlled via governance, as is the setting of the min parameter - the minimum number of valid feeds required in order for the medianized value to be considered valid.
The medianizer is the smart contract which provides MoC trusted reference price.
It maintains a whitelist of price feed contracts which are allowed to post price updates and a record of recent prices supplied by each address. Every time a new price update is received the median of all feed prices is re-computed and the medianized value is updated.
If you are going to start to consume oracle in your contract/app please point to Proxy Oracle, if you don't want to change address of the new version of MoC Oracles ( Decentralized Oracle) when its ready (soon)
| Price | Project | Network | Contract | Address |
|---|---|---|---|---|
| BTC/USD | MOC | Testnet | Medianizer | 0x26a00aF444928d689DDEC7b4D17c0E4a8c9D407d |
| RIF/USD | RDOC | Testnet | Medianizer | 0x987ccC60c378a61d167B6DD1EEF7613c6f63938f |
| ETH/BTC | ETH | Testnet | Medianizer | 0x4d4254d3744e1e4beb090ab5d8eb48096Ff4AE27 |
| BTC/USDT | USDT | Testnet | Medianizer | 0xB4A44672b55d66fAFA23b4F9Ba28c9C55F76fbfB |
| BTC/USD | MOC | Mainnet | Medianizer | 0x7B19bb8e6c5188eC483b784d6fB5d807a77b21bF |
| RIF/USD | RDOC | Mainnet | Medianizer | 0x504EfCadFB020d6bBaeC8a5c5BB21453719d0E00 |
| ETH/BTC | ETH | Mainnet | Medianizer | 0x68862C30d45605EAd8D01eF1632F7BFB18FAB587 |
| BTC/USDT | USDT | Mainnet | Medianizer | 0x5741d55C96176eEca86316b5840Cb208784d5188 |
Consuming oracle from another contract
Take a look to Oracle Interface IMoCBaseOracle. It return tuple, the price in wei and boolean if is valid result.
Note: If the tuple return boolean false (not valid), consider not used or raise an error because the price is out of time limit.
pragma solidity 0.5.8;
/**
* @dev Interface of MoCs Oracles
*/
interface IMoCBaseOracle {
function peek() external view returns (bytes32, bool);
}
Take a look to github api site
Install packages
npm install
compile source contracts
npm run truffle-compile
private key
export MNEMONIC=(Private key)
run deployment
npm run deploy-eth-testnet