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Coprocessor: Data Fetching with web3 Function Oracles



web3 function oracles, such as Phat Contracts, bridge the gap between on-chain dApps and off-chain data and computation, enabling secure, cost-effective, and flexible dApp development. They allow access to real-world information and complex computations without the high gas costs of on-chain execution, opening up new possibilities across finance, insurance, gaming, and more. Phat Contracts offer a decentralized, customizable, and easy-to-integrate solution for leveraging external APIs and computations, driving innovation and expanding the functionality of dApps on mainstream blockchains.


In the rapidly evolving landscape of decentralized applications (dApps), the integration of real-world data and off-chain computation into blockchain ecosystems stands as a pivotal challenge for developers. The advent of web3 function oracles presents a groundbreaking solution, bridging the gap between on-chain and off-chain environments and unlocking a new realm of possibilities for dApp developers. Among the most innovative implementations of this concept are Phat Contracts, which offer a versatile platform for leveraging off-chain data and computation within blockchain applications.

The Role of web3 Function Oracles in dApp Development

web3 function oracles serve as secure, decentralized conduits for fetching external data and performing computations outside the blockchain, before securely relaying the outcomes back to smart contracts. This capability is crucial for dApps that require access to real-world information or need to execute complex algorithms impractical to run on-chain due to gas costs or computational limitations.

The utility of web3 function oracles extends across various sectors, including finance, insurance, gaming, and more, enabling use cases such as dynamic pricing, automated claims processing, provably fair gaming outcomes, and decentralized finance (DeFi) protocols that react to real-world events.

Advantages of web3 Function Oracles

  1. Decentralization and Security: By leveraging decentralized networks, function oracles ensure that data and computation are tamper-proof and reliable, minimizing trust issues and security vulnerabilities associated with centralized providers.
  1. Cost Efficiency: Off-chain computation reduces the gas fees associated with on-chain execution, making complex operations economically viable for dApps.
  1. Flexibility and Scalability: Developers can utilize a wide range of APIs and perform heavy computations off-chain, enabling more complex and feature-rich dApps without sacrificing performance or scalability.
  1. Real-time Data Access: Function oracles facilitate access to up-to-date information from the external world, ensuring that dApps can respond promptly to changes in market conditions, social media trends, weather patterns, and more.

Phat Contracts: Harnessing the Power of Function Oracles

Phat Contracts represent a cutting-edge implementation of web3 function oracles, providing a robust framework for developers to integrate off-chain data and computations into their dApps. By combining the security and decentralization of blockchain with the versatility of external APIs and custom computations, Phat Contracts open up a new frontier for dApp functionality and innovation.

Power of Function Oracles
Power of Function Oracles

Features of Phat Contracts

  • Customizable Data Fetching: Developers can specify exactly what data their dApps need, from any public or private API, and define how this data should be processed before being relayed back to the blockchain.
  • Decentralized and Secure: Phat Contracts run on a decentralized network, ensuring that the data and computations they provide are resistant to manipulation and censorship.
  • Easy Integration: With support for all mainstream blockchains, Phat Contracts offer a seamless integration process, allowing developers to quickly leverage external data and computation in their dApps.

Real-world Examples of Phat Contracts in Action

  1. Decentralized Finance Protocols: Phat Contracts can supply DeFi platforms with real-time financial data, such as exchange rates and asset prices, enabling automated trading strategies and dynamic pricing models.
  1. Insurance Applications: By fetching and processing real-world data, such as weather information or flight statuses, Phat Contracts can automate claim assessments and payouts for decentralized insurance dApps.
  1. Gaming and NFTs: In the realm of blockchain gaming and NFTs, Phat Contracts can generate verifiable random numbers for provably fair outcomes or fetch real-world data to influence game mechanics and NFT attributes dynamically.
  1. Social Media Integrations: For dApps looking to interact with social media platforms, Phat Contracts can query APIs for content, metrics, and user data, bridging the gap between web3 and traditional social media.


web3 function oracles, exemplified by Phat Contracts, represent a significant leap forward in the capabilities of decentralized applications. By enabling secure, efficient, and versatile access to off-chain data and computation, these technologies empower developers to create more complex, responsive, and useful dApps than ever before. As the blockchain ecosystem continues to mature, the role of function oracles in driving innovation and adoption is set to grow, making them an essential tool in the dApp developer's toolkit.

About Phala

Phala Network is a decentralized cloud that offers secure and scalable computing for Web3.

With Phat Contracts, an innovative programming model enabling trustless off-chain computation, developers can create new Web3 use cases.

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