> For the complete documentation index, see [llms.txt](https://docs.merlinchain.io/merlin-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.merlinchain.io/merlin-docs/developers/builder-guides/developer-tools/oracle.md). # Oracle An Oracle is a tool that brings external data into the blockchain, allowing smart contracts to access real-world information such as prices, weather, and transportation data. This provides critical reference points for the execution of smart contracts. In the Web3 ecosystem, Oracles act as a bridge between the blockchain and the real world. They enable smart contracts to achieve a greater variety of functionalities, thereby advancing the application of blockchain technology across various fields. Merlin Chain has successfully integrated several Oracle projects. Developers can visit the website and documentation to choose the Oracle that best fits their project development needs and expectations for deployment. * [Pyth Network](https://pyth.network/) * [RedStone](https://redstone.finance/) * [API3](https://api3.org/) * [APRO Oracle](https://www.apro.com/) --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.merlinchain.io/merlin-docs/developers/builder-guides/developer-tools/oracle.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.