Skip to main content
Please view the third-party content disclaimer here.
Supra provides oracle price feeds for EVM-compatible chains including Polygon. Two integration patterns are available: Pull Oracle (fetch proof data off-chain, then submit onchain) and Push Oracle (read S-Values directly from an onchain contract).

​
Pull Oracle integration

The Pull Oracle fetches proof data from Supra’s gRPC server and passes it to your smart contract via a JavaScript client.

​
Prerequisites

  • Node.js installed.
  • A deployed smart contract that accepts Supra proof data.

​
Install dependencies

Clone the Supra repository or download the source, then run: 
npm install

​
Configure main.js

Set the following parameters before running the client. gRPC server address:
EnvironmentAddress
Mainnetmainnet-dora-2.supra.com:443
Testnettestnet-dora-2.supra.com:443
REST server address:
EnvironmentURL
Mainnethttps://rpc-mainnet-dora-2.supra.com
Testnethttps://rpc-testnet-dora-2.supra.com
Pair indexes (example): 
const pairIndexes = [0, 21, 61, 49];
Chain type: 
const chainType = 'evm';
RPC URL: 
const web3 = new Web3(new Web3.providers.HttpProvider('<RPC URL>'));

​
Configure contract interaction

Update the ABI path: 
const contractAbi = require("../resources/abi.json");
Set the contract address: 
const contractAddress = '<CONTRACT ADDRESS>';
Update the function call to match your contract: 
const txData = contract.methods.GetPairPrice(hex, 0).encodeABI();
Estimate gas: 
const gasEstimate = await contract.methods.GetPairPrice(hex, 0).estimateGas({ from: "<WALLET ADDRESS>" });
Build the transaction: 
const transactionObject = {
  from: "<WALLET ADDRESS>",
  to: contractAddress,
  data: txData,
  gas: gasEstimate,
  gasPrice: await web3.eth.getGasPrice()
};
Sign with your private key: 
const signedTransaction = await web3.eth.accounts.signTransaction(transactionObject, "<PRIVATE KEY>");

​
Run the application

node main.js
This retrieves proof data from Supra’s servers and submits it to your contract using the configured parameters.

​
Push Oracle integration

The Push Oracle exposes real-time data feeds (S-Values) directly onchain through a Solidity interface.

​
Step 1: Define the S-Value interface

Add this interface to your contract: 
pragma solidity 0.8.19;

interface ISupraSValueFeed {
    struct priceFeed {
        uint256 round;
        uint256 decimals;
        uint256 time;
        uint256 price;
    }

    struct derivedData {
        int256 roundDifference;
        uint256 derivedPrice;
        uint256 decimals;
    }

    function getSvalue(uint256 _pairIndex) external view returns (priceFeed memory);

    function getSvalues(uint256[] memory _pairIndexes) external view returns (priceFeed[] memory);

    function getDerivedSvalue(uint256 pair_id_1, uint256 pair_id_2, uint256 operation)
        external
        view
        returns (derivedData memory);

    function getTimestamp(uint256 _tradingPair) external view returns (uint256);
}

​
Step 2: Initialize the feed address

Set the S-Value feed contract in your constructor. Replace the address below with the correct network-specific Supra contract address. 
contract ISupraSValueFeedExample {
    ISupraSValueFeed internal sValueFeed;

    constructor() {
        sValueFeed = ISupraSValueFeed(0xE92D276bBE234869Ecc9b85101F423c6bD26654A);
    }
}

​
Step 3: Read S-Value data

Use these functions to fetch single or multiple S-Values, or derive new data pairs: 
function getPrice(uint256 _priceIndex)
    external
    view
    returns (ISupraSValueFeed.priceFeed memory)
{
    return sValueFeed.getSvalue(_priceIndex);
}

function getPriceForMultiplePair(uint256[] memory _pairIndexes)
    external
    view
    returns (ISupraSValueFeed.priceFeed[] memory)
{
    return sValueFeed.getSvalues(_pairIndexes);
}

function getDerivedValueOfPair(uint256 pair_id_1, uint256 pair_id_2, uint256 operation)
    external
    view
    returns (ISupraSValueFeed.derivedData memory)
{
    return sValueFeed.getDerivedSvalue(pair_id_1, pair_id_2, operation);
}
Add an owner-controlled function to update the Supra feed contract address for future upgrades: 
function updateSupraSvalueFeed(ISupraSValueFeed _newSValueFeed)
    external
    onlyOwner
{
    sValueFeed = _newSValueFeed;
}