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INTRODUCTION The Basics Random Numbers API Calls Other Tutorials Basic Request Model Decentralized Data Model Off-Chain Reporting
USING DATA FEEDS Introduction to Data Feeds Get the Latest Price (EVM) Get the Latest Price (Solana) Historical Price Data Feed Registry API Reference ENS Ethereum Data Feeds Binance Smart Chain Data Feeds Polygon (Matic) Data Feeds xDai Data Feeds Huobi Eco Chain Data Feeds Avalanche Data Feeds Fantom Data Feeds Arbitrum Data Feeds Harmony Data Feeds Solana Data Feeds Optimism Data Feeds
USING RANDOMNESS Introduction to Chainlink VRF Get a Random Number API Reference Security Considerations Contract Addresses Best Practices
USING CHAINLINK KEEPERS Introduction Making Compatible Contracts Register Upkeep for a Contract Patterns and Best Practices Network Overview FAQs
USING ANY API Introduction to Using Any API Make a GET Request Make an Existing Job Request Multi-Variable Responses Large Responses Find Existing Jobs API Reference Contract Addresses
DEVELOPER REFERENCE Install Instructions LINK Token Contracts Developer Communications Getting Help Data Provider Nodes Hackathon Resources Contributing to Chainlink Install, configure & fund MetaMask Acquire testnet LINK Deploy your first contract Fund your contract Use your first contract!

Architecture Overview

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Request Model Banner

Basic Request Model

Chainlink connects smart contracts with external data using its decentralized oracle network. Chainlink API requests are handled 1:1 by an oracle.

The Basic Request Model describes the on-chain architecture of requesting data from a single oracle source.

To learn how to make a GET request using a single oracle, see Make a GET Request.

Decentralized Data Model

For a more robust and trustworthy answer, you can aggregate data from many oracles. With on-chain aggregation, data is aggregated from a decentralized network of independent oracle nodes. This architecture is applied to Chainlink Data Feeds, which can aggregate data such as asset price data.

The Decentralized Data Model describes how data is aggregated, and how consumer contracts can retrieve this data.

To learn how to consume the price of ETH in your smart contract, see Get the Latest Price.

What's Next

› Basic Request Model
› Decentralized Data Model
› Off-Chain Reporting