Oracles

Overview
Tranquil Finance currently uses an oracle stack based on Chainlink price feeds.
Legacy Oracles
After migrating to use Chainlink oracles, this section is now only here for references purposes.
TWAP Oracles
We use a 10-minute TWAP oracle for each supported Sushiswap pair. These oracles are based on the design recommended and supported by Uniswap V2, which also applies to the Sushiswap fork.
This type of TWAP oracle is resistant to flashloan attacks, like the recent exploit on CREAM Finance. However, one weakness of TWAP oracles is the freshness of the price in volatile market conditions. For this reason, we will keep conservative collateral factors for all markets until Chainlink oracles are integrated.
Fallback Oracle
In addition to the TWAP oracles, the team also maintains a fallback oracle that kicks in if the TWAP oracle price is not fresh or the pair has insufficient liquidity. The prices are queried from Coingecko and periodically posted to the contract.
The team also have a suite of alerts paging us when anomalies occur, such as discrepancies in the oracle price. We will take swift and appropriate action to defend the assets deposited with the protocol.
Community Faucet
Because the Sushiswap TWAP oracles require constant updates to maintain freshness, we have jobs to periodically make the update transactions. Additionally, we have implemented an economic incentive for the community to help keep the oracles up to date. 
Anyone can claim a small amount of TRANQ that is slowly dripped by the faucet. In doing so, the transaction also updates the TWAP oracles. Harmony's low fees makes claiming from the faucet regularly worthwhile to do.
Contracts
These are the main oracles for Tranquil Finance:
Contract
Text
TranquilPriceOracle
0x0C99E05CD2dCb52A583a3694F4d91813eFb5B071
ChainlinkPriceOracle
0x1b2dC29Bcd7B54021514aE9A06dE9ebD20597819
UniswapOracle
0x5Aaa4233a27CD10E8c31dE34E25dB7Ee2b976C5a
FallbackOracle
0x6BFf70a4e7e2574F309fD5999492E478f2Fb737A
For our legacy UniswapOracle, each Sushiswap pair has its own TWAP oracle:
Sushiswap Pair
Contract Address
1WBTC / WONE
0xbd69ad94354933D459abAD93F8769f1f146DDC0a
1ETH / WONE
0x3096CDdAcc8a81C27c3F8F225B9b61A6c52E2CAd
1USDC / WONE
0xfD494aa1617446843Db82ad4f2F3B18f7b1393Ca
1USDT / WONE
0x64f48DF335a79dABDB1cB754729Fa80B065d788d

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Legacy Oracles

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