Create custom price feed for WBTC #737
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kevincheng96
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Final audit report from OZ |
kevincheng96
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This generalizes the logic used in the recently audited [`WBTCPriceFeed`](#737) to create a `MultiplicativePriceFeed` that derives its price from multiplying the prices from two other price feeds together. This is a flexible wrapper price feed that can be used to generate prices for any asset that does not have a price feed that fits Comet's expected price denomination. e.g. if we wanted to add `cbETH` to `cUSDCv3`, there is no Chainlink price feed for `cbETH / USD`, so we would need to multiply the `cbETH / ETH` and `ETH / USD` price feeds together to get `cbETH / USD`
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This PR creates a custom price feed for WBTC / USD by reading from both the WBTC / BTC and BTC / USD price feeds. This will allow the cUSDCv3 market to get a more accurate price for WBTC.
We also organize the contracts repo by moving all the custom price feed contracts into a separate
pricefeedssubdirectory.