How to get all the historical data from chainlink price feeds?

Question

I wanted to pull the historical data stored by the reference data contracts by chainlink oracles. Since all the data is on-chain, I should be able to view it all? But currently, my contract can only see the latest answer. Any thoughts?

pragma solidity ^0.6.0;
import "@chainlink/contracts/src/v0.6/dev/AggregatorInterface.sol";
contract ReferenceConsumer {
  AggregatorInterface internal ref;
constructor(address _aggregator) public {
    ref = AggregatorInterface(_aggregator);
  }
function getLatestAnswer() public returns (int256) {
    return ref.latestAnswer();
  }
}

score 5 · Accepted Answer · answered Jul 06 '20 at 15:55

You can view the entire history of reference contracts, you'll want to use the getPreviousAnswer method below, and input how many answers back you'd like to go.

pragma solidity ^0.6.0;
import "@chainlink/contracts/src/v0.6/dev/AggregatorInterface.sol";
contract ReferenceConsumer {
  AggregatorInterface internal ref;
constructor(address _aggregator) public {
    ref = AggregatorInterface(_aggregator);
  }
function getLatestAnswer() public returns (int256) {
    return ref.latestAnswer();
  }
function getLatestTimestamp() public returns (uint256) {
    return ref.latestTimestamp();
  }
function getPreviousAnswer(uint256 _back) public returns (int256) {
    uint256 latest = ref.latestRound();
    require(_back <= latest, "Not enough history");
    return ref.getAnswer(latest - _back);
  }
function getPreviousTimestamp(uint256 _back) public returns (uint256) {
    uint256 latest = ref.latestRound();
    require(_back <= latest, "Not enough history");
    return ref.getTimestamp(latest - _back);
  }
}

this will only work for the current aggregator phase and wont let you go all the way back to the first round — Jonah, Feb 15 '22 at 06:55

score 0 · Answer 2 · answered Feb 15 '22 at 06:53

I've written a library that lets you get the prev() or next() roundId from a given roundId:

https://github.com/JonahGroendal/chainlink-round-id-calc/blob/master/contracts/ChainlinkRoundIdCalc.sol

You can use prev() to go back all the way to the very first round if you want.

score 0 · Answer 3 · answered Sep 26 '22 at 13:34

Update September 2022

You can now easily view historical price data by using checkthechain.

Below is a minimal working example using the Python package:

from ctc.protocols import chainlink_utils
feed = '0x31e0a88fecb6ec0a411dbe0e9e76391498296ee9'
data = await chainlink_utils.async_get_feed_data(feed)

Alternatively, you can also use their API.

How to get all the historical data from chainlink price feeds?

3 Answers3

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