Price Oracle

Um oráculo de preços fornece dados de mercado externos para contratos inteligentes, permitindo que eles reajam às mudanças de preços do mundo real.

🌐 Termos em outros idiomas:

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Oráculos de preços são componentes essenciais de aplicações de finanças descentralizadas (DeFi). Eles preenchem a lacuna entre contratos inteligentes on-chain e fontes de dados off-chain, como exchanges centralizadas (CEXs) e exchanges descentralizadas (DEXs). Isso permite que contratos inteligentes acessem feeds de preços em tempo real para vários ativos, acionando ações com base nas condições do mercado. Sem oráculos, contratos inteligentes seriam isolados e incapazes de interagir com dados externos, limitando severamente sua funcionalidade. Oráculos também podem fornecer outros dados, como taxas de juros ou dados meteorológicos, mas feeds de preços são o caso de uso mais comum em DeFi.

        graph LR
  Center["Price Oracle"]:::main
  Pre_economics["economics"]:::pre --> Center
  click Pre_economics "/terms/economics"
  Rel_oracles["oracles"]:::related -.-> Center
  click Rel_oracles "/terms/oracles"
  Rel_smart_contracts["smart-contracts"]:::related -.-> Center
  click Rel_smart_contracts "/terms/smart-contracts"
  Rel_chainlink["chainlink"]:::related -.-> Center
  click Rel_chainlink "/terms/chainlink"
  classDef main fill:#7c3aed,stroke:#8b5cf6,stroke-width:2px,color:white,font-weight:bold,rx:5,ry:5;
  classDef pre fill:#0f172a,stroke:#3b82f6,color:#94a3b8,rx:5,ry:5;
  classDef child fill:#0f172a,stroke:#10b981,color:#94a3b8,rx:5,ry:5;
  classDef related fill:#0f172a,stroke:#8b5cf6,stroke-dasharray: 5 5,color:#94a3b8,rx:5,ry:5;
  linkStyle default stroke:#4b5563,stroke-width:2px;

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Imagine a [smart contract](/pt/terms/smart-contract) is like a robot that can only follow instructions inside its factory. A price [oracle](/pt/terms/oracle) is like a trusted messenger who goes outside, checks the price of something, and tells the robot the correct price so it can do its job.

🤓 Expert Deep Dive

Price oracles are essential for enabling complex smart contract functionalities such as derivatives trading, lending protocols, stablecoins, and synthetic assets. The security and reliability of a price oracle directly impact the security of the dependent DeFi protocols. Architecturally, DONs often use a Time-Weighted Average Price (TWAP) or Volume-Weighted Average Price (VWAP) calculation across multiple sources to mitigate the impact of single-source manipulation or temporary exchange volatility. Cryptoeconomic incentives, such as staking and slashing mechanisms for oracle node operators, are employed to ensure honest data reporting. Edge cases include handling exchange downtime, API rate limits, and the 'oracle problem' itself – the inherent difficulty in obtaining truly decentralized and manipulation-resistant external data. Advanced oracle designs incorporate threshold signatures, verifiable random functions (VRFs), and cross-chain data feeds to enhance security and utility.