# 高级概念

## 获取最新价格

由于Frax协议每天只更新一次Frax Oracle的价格，因此价格可能会有最多23小时59分钟的延迟。如果您需要更新的价格，可以在Dual Oracle上调用addRoundData()来写入一个最新价格，然后在Frax Oracle上调用latestRoundData() / getRoundData() / getPrice()来获取最新价格。

## 智能合约设计

<figure><img src="/files/cbSf1DRCGIaBlgwlndos" alt=""><figcaption><p>L1 -> L2</p></figcaption></figure>

## 时间锁配置

控制所有L1上Frax Oracle的所有配置：[`0x8412ebf45bAC1B340BbE8F318b928C466c4E39CA`](https://etherscan.io/address/0x8412ebf45bac1b340bbe8f318b928c466c4e39ca)

控制所有Arbitrum上Frax Oracle的所有配置：[`0xB426B13372B7c967C4a2371B5e95FC7dc37545Db`](https://arbiscan.io/address/0xb426b13372b7c967c4a2371b5e95fc7dc37545db)

## 攻击与缓解

对Oracle操纵攻击的处理是经济性的。协议拥有的流动性太多，以至于操纵Curve/Uniswap池子不会带来利润。

价格限制确保frxEth/sfrxEth永远不会被高估，并且不会被低估超过30%。frxEth完全由验证者中的ETH支持，因此它面临的唯一风险是时间延续风险。

## 合约地址

### L1

#### Dual Oracles / Price Sources

FrxEthEthDualOracle: [`0x350a9841956D8B0212EAdF5E14a449CA85FAE1C0`](https://etherscan.io/address/0x350a9841956D8B0212EAdF5E14a449CA85FAE1C0)

SfrxEthEthDualOracle: [`0x584902BCe4282003E420Cf5b7ae5063D6C1c182a`](https://etherscan.io/address/0x584902bce4282003e420cf5b7ae5063d6c1c182a)

#### Frax Oracles

SfrxEthFraxOracle: [`0x3d3D868522b5a4035ADcb67BF0846D61597A6a6F`](https://etherscan.io/address//0x3d3d868522b5a4035adcb67bf0846d61597a6a6f)

#### Crosschain

ArbitrumBlockHashRelay: [`0x784906554d44d33c2764c86e8848a2bd71c2e3a7`](https://etherscan.io/address/0x784906554d44d33c2764c86e8848a2bd71c2e3a7)

### L2 (Arbitrum)

ArbitrumBlockHashProvider:  [`0x240ff0894c584d39f992de5fdb603e03fc7e8a98`](https://arbiscan.io/address/0x240ff0894c584d39f992de5fdb603e03fc7e8a98)

StateRootOracle: [`0x11afa1d35f246fdc00d789e4a06f682b206f88c9`](https://arbiscan.io/address/0x11afa1d35f246fdc00d789e4a06f682b206f88c9)

#### Price Source

MerkleProofPriceSource: [`0xb032b46f835fa9e3d95d1e3f46fd307429505f9a`](https://arbiscan.io/address/0xb032b46f835fa9e3d95d1e3f46fd307429505f9a)

双重预言机 / 价格来源

FrxEthEthDualOracle: TBD

SfrxEthEthDualOracle: TBD

#### Frax Oracles

SfrxEthFraxOracle: TBD


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