Interacting With Chainlink Contracts

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How to Query Chainlink Contracts

This page will provide you with information regarding how to query a Chainlink Aggregator

Included are some examples using bash.

All examples are based on the LINK / USD price feed on Ethereum Mainnet

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Overview

Each Chainlink Aggregator has a wide range of data that you can query.

From historic price data to the timestamp of the most recent completed round, a lot of information is stored on-chain and available for you to query.

This page will be broken out into each major contract type, and then each individual query that can be made, with examples.

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How To Format Request Data

Formatting the data we want to send in our RPC calls is a bit tricky if you've never done it before.

This page will assist you in learning how to do this as well as provide outside resources to make it a bit easier.

Formatting RPC Call Data

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In the Below tables, you can navigate to each contract's separate Read and Write RPC calls.

Each page will container example curl requests and example responses.

While curl is nowhere near the most common way to interact with smartcontracts, I felt it would provide the simplest and most detailed information possible.

EACAggregatorProxy
LINK / USD EACAggregatorProxy contract address: 0x2c1d072e956affc0d435cb7ac38ef18d24d9127c
Managing an Aggregator Proxy	Directions on deploying and managing an EACAggregatorProxy.sol contract to help manage your own price feed
Read Calls	The Read calls are queries you can make to each EACAggregatorProxy to get a wide range of data from the proxy's associated AccessControlledOffchainAggregator contract. One such example is to get the latest round data from a price feed.
Write Calls	The Write calls that are available to each EACAggregatorProxy are used to make changes to the contract. An example of a write call would be to change the associated AccessControlledOffchainAggregator

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SimpleWriteAccessController
LINK / USD (Billing) SimpleWriteAccessController contract address: 0x9db83cef9f68b63989e4e82d65d549e7ff2acda9
LINK / USD (Requester) SimpleWriteAccessController contract address: 0x641b698ad1c6e503470520b0eecb472c0589dfe6
Managing an Access Controller	Directions on deploying and managing a SimpleWriteAccessController.sol contract to build your own price feed.
Read Calls	The Read calls are queries you can make to each SimpleWriteAccessController to get relevant information to check access and state of a contract. One such example is to get to check if a provided address has access permissions to make a specified call.
Write Calls	The Write calls that are available to each SimpleWriteAccessController are used to make changes to the contract. An example of a write call would be to replace one Chainlink Node for another.

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AccessControlledOffchainAggregator
LINK / USD AccessControlledOffchainAggregator contract address: 0xDfd03BfC3465107Ce570a0397b247F546a42D0fA
Managing an OCR Aggregator	Directions on deploying and managing an AccessControlledOffchainAggregator.sol contract to build your own price feed.
Read Calls	The Read calls are queries you can make to each AccessControlledOffchainAggregator to get a wide range of on-chain data. One such example is to get the latest round data from a price feed.
Write Calls	The Write calls that are available to each AccessControlledOffchainAggregator are used to make changes to the contract. An example of a write call would be to change the adminAddress of a Chainlink Node

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