> For the complete documentation index, see [llms.txt](https://steakhouse.financial/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://steakhouse.financial/docs/risk-management/zh/collateral/layers-pillars-and-criteria/market-rating-layer-3/yu-yan-ji.md).

# 预言机

预言机风险是 Steakhouse Financial 市场评级层中的四项标准之一，用于评估资产价格的来源及其在链上的应用方式。Steakhouse Financial 开发了一个 MetaOracle，在发生偏离时可在两条价格喂价之间切换。

智能合约交互中的价值转移由资产定价决定。价格应当可在链上观测，在用户操作期间被正确应用，并反映资产的公允价值。

在定价方面，有两个相关的语境。市场价格反映流动性和价格影响，而价格影响由流动性提供者的价差和滑点构成。相比之下，公允价值反映的是在可无任何费用向发行方赎回时的一级市场价值。

这种赎回可能受通知期限制，从而降低在链上以原子方式交易该资产的能力。为了市场稳定并避免市场价格操纵，应优先采用公允价值；而在发生重大市场事件期间，二级市场定价可能更为合适。在 Steakhouse Financial，我们开发了一个 MetaOracle，在发生偏离时可在两条价格喂价之间切换。

{% hint style="info" %}
指标：

* 基于市场或基于 NAV 的类型预言机
* 在发生偏离时借助 MetaOracle 在喂价之间切换的能力
* 锚定资产或锚定价值类型
  {% endhint %}


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