Building Custom Oracle Contracts
Learn how to design and implement your own oracle pattern in Solidity, including request-response flows, trusted updaters, and validating data freshness on-chain.
Beyond Third-Party Oracles
Chainlink and similar networks cover common feeds, but sometimes you need data nobody else provides, like a proprietary API result. In those cases you build a custom oracle: an off-chain updater plus an on-chain contract that stores and serves the data.
The Two-Party Design
A custom oracle has two sides:
- Off-chain updater: a server that reads the external source and sends transactions.
- On-chain contract: stores the latest value and exposes a read function for other contracts.
All lessons in this course
- The Oracle Problem Explained
- Integrating Chainlink Oracles
- Handling Off-chain Data Retrieval
- Building Custom Oracle Contracts