DataLink (Push Delivery)
DataLink push-based feeds provide access to specialized data from Data Providers through direct onchain delivery, enabling smart contracts to read the latest data values without additional offchain infrastructure.
Key Characteristics
- Specialized market data: Access specialized datasets directly from individual Data Providers
- Push Delivery: Data is automatically updated onchain by Decentralized Oracle Networks (DONs)
- Smart contract integration: Read data directly in your smart contracts using standard interfaces
- Proven architecture: Built on Chainlink's battle-tested aggregation infrastructure with robust data quality mechanisms
How It Works
- Data Providers submit specialized data to Chainlink Decentralized Oracle Networks (DONs)
- DONs aggregate and validate the data using consensus mechanisms
- Smart contracts automatically receive updated values onchain through aggregator contracts
- Applications read the latest data directly from smart contracts using standard interfaces
This push-based model eliminates the need for offchain data fetching while maintaining cryptographic security and data integrity.
Integration Methods
Smart Contract Integration
Read data directly in your smart contracts using the AggregatorV3Interface:
- Latest data: Get the most recent price and timestamp
- Historical data: Access previous rounds of data updates
Offchain Integration
Access feed data from external applications using Web3 libraries:
- JavaScript/TypeScript: Using web3.js or ethers.js
- Python: Using Web3.py
- Other languages: Any Web3-compatible library
Getting Started
1. Choose Your Integration Method
- Smart Contract: Integrate directly in Solidity contracts for automated onchain logic
- Offchain Application: Read data from external applications using Web3 libraries
2. Find Your Data Provider
Browse the Provider Catalog to find Data Providers offering the specialized data you need.
3. Follow the Tutorials
Start with our step-by-step Tutorials covering:
- Using DataLink feeds in smart contracts
- Reading feeds from offchain applications
- Best practices for data validation and error handling
4. Reference Documentation
Consult the API Reference for:
- Complete smart contract interface documentation
- Function specifications and return values