> For the complete documentation index, see [llms.txt](https://fxprotocol.gitbook.io/fx-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://fxprotocol.gitbook.io/fx-docs/risk-management/oracle/eth.md).

# ETH

### ETH Oracle Mechanisms on Katana

#### ETH/USD Spot oracle:

* \[[Chainlink ETH/USD Spot](https://data.chain.link/feeds/katana/mainnet/eth-usd)]
* \[[Sushi V3 USDC/ ETH 0.05% Spot](https://www.sushi.com/katana/pool/v3/0x2a2c512beaa8eb15495726c235472d82effb7a6b)]

#### weETH/ETH Rate Provider oracle:

* \[[weETH/ETH Chainlink Spot](https://data.chain.link/feeds/katana/mainnet/weeth-eth)]

#### ETH/USD Anchor Price oracle:

* \[[Chainlink ETH/USD Spot](https://data.chain.link/feeds/katana/mainnet/eth-usd)]

#### The Algorithm of ETH/USD Max and Min Price:

* Max: ETH/USD Price=max(anchorPrice, ETH/USD Spot)
* Min: ETH/USD Price=min(anchorPrice, ETH/USD Spot)

### Price Checking Mechanism:

* Anchor Price is used, while the price difference between Anchor Price and Max/Min Price exceeds the threshold
* The threshold is a governed parameter, 2% in default

### Conclusion:

* Min ETH/USD Price is used for Open/Close of xPOSITION risk control, Rebalance and Liquidation if the price difference between Anchor Price and Min Price doesn’t exceed the threshold. Anchor Price is used otherwise. 
* Max ETH/USD Price is used for Redeeming fxUSD if the price difference between Anchor Price and Max Price doesn’t exceed the threshold. Anchor Price is used otherwise. 


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