# Introduction to Fact Oracle Services

The Fact Oracle offers a comprehensive suite of oracle solutions designed to meet diverse data requirements in blockchain-based applications. These solutions provide secure, accurate, and efficient access to real-world data, empowering smart contracts and decentralized applications (DApps) to function reliably. The Fact Oracle system includes three distinct types of services:

Synchronous (Push) Oracle
Asynchronous (Pull) Oracle
DApp Oracle

Each service type is tailored to specific use cases and workflows, ensuring flexibility and scalability for developers and users.

# 1. Synchronous (Push) Oracle

The Synchronous Oracle provides real-time data updates directly on-chain. Data feeds are periodically updated, allowing smart contracts to fetch the latest data without delays.

Use Case: Ideal for applications requiring continuous access to on-chain data, such as economic indices and public metrics.
Integration: Developers retrieve data using the getSyncData function in the Fact Oracle contract.

/sync

# 2. Asynchronous (Pull) Oracle

The Asynchronous Oracle operates on a request-response model. Users submit data requests, and responses are processed asynchronously, providing flexibility in handling complex or large-scale data queries.

Use Case: Suitable for scenarios where data requests are specific or dynamic, such as weather information, real estate details, or car insurance data.
Integration: Developers submit requests using the requestAsyncData function and process responses via OracleDataCallback or OracleBytesCallback.

/async

# 3. DApp Oracle

The DApp Oracle combines the strengths of push and pull models in a hybrid solution. DApps interact directly with the Fact Finance API to request data, which is returned in a signed DataPackage for on-chain verification.

Use Case: Designed for DApps requiring off-chain data integrity and on-chain validation, ensuring secure and transparent interactions.
Integration: Developers request data from the API and validate it on-chain using the verifyDappData function.

/dapp

# Choosing the Right Oracle Solution

The choice of oracle depends on your application's specific needs:

Choose Synchronous Oracle for real-time, continuously updated on-chain data.
Opt for Asynchronous Oracle when handling specific or complex data requests.
Use DApp Oracle for hybrid workflows requiring off-chain API interactions and on-chain verification.

By leveraging Fact Oracle’s tailored solutions, developers can build robust and secure blockchain applications that seamlessly interact with real-world data.

For more information, visit our documentation pages for each service or contact us at [email protected].