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Pyth

The Pyth network a first-party oracle network, securely and transparently delivering real-time market data to multiple chains.

The network comprises some of the world’s largest exchanges, market makers, and financial services providers. These publish proprietary data on-chain for aggregation and distribution to smart contract applications.

Pyth price feeds​

The Pyth network introduces an innovative low-latency pull oracle design, where users can pull price updates on-chain when needed, enabling everyone in the blockchain environment to access that data point. Pyth network updates the prices every 400ms, making Pyth the fastest on-chain oracle.

Here is a working example of a contract that fetches the latest price of ARB/USD on the Arbitrum network.

You have to pass Pyth's contract address for Arbitrum mainnet/testnet and the desired price feed ID to fetch the latest price.

Install the Pyth SDK Solidity package in your project:

npm install @pythnetwork/pyth-sdk-solidity

And then, in a few lines of code you can fetch the latest price on the Arbitrum network.

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;
import "@pythnetwork/pyth-sdk-solidity/IPyth.sol";
import "@pythnetwork/pyth-sdk-solidity/PythStructs.sol";
contract MyFirstPythContract {
    IPyth pyth;
    // Pass the address of Pyth's contract for Arbitrum mainnet(0xff1a0f4744e8582DF1aE09D5611b887B6a12925C)
    constructor(address _pyth) {
        pyth = IPyth(_pyth);
    }
    function fetchPrice(
        bytes[] calldata updateData,
        bytes32 priceFeed
    ) public payable returns (int64) {
   // Fetch the priceUpdate from hermes.
        uint updateFee = pyth.getUpdateFee(updateData);
        pyth.updatePriceFeeds{value: updateFee}(updateData);
        // Fetch the latest price
        PythStructs.Price memory price = pyth.getPrice(priceFeed);
        return price.price;
    }
}

Here you can fetch the updateData from Pyth's Hermes feed, which listens to Pythnet and Wormhole for price updates; or you can use the pyth-evm-js SDK. Check How to Fetch Price Updates to pull the latest data.

Pyth Entropy​

Pyth Entropy allows developers to quickly and easily generate secure random numbers on the blockchain.

Check how to generate random numbers in EVM contracts for a detailed walkthrough.

Supported networks for Arbitrum(Pyth Entropy):​

Additional resources​

Check out the following links to get started with Pyth: