Walkthrough: Adding Price Index Data

A specific example of using an adapter

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Follow these instructions to bring the most recent price data on-chain for a given price index.

Complete Example:

    /**
     * @notice Example for calling a protocol function with a prediction value from the Upshot Adapter
     * 
     * @param protocolFunctionArgument An argument for the protocol function
     * @param upshotAdapterData The signed data from the Upshot Adapter
     */
    function callProtocolFunctionWithUpshotAdapterPredictionValue(
        uint256 protocolFunctionArgument,
        UpshotAdapterNumericData calldata upshotAdapterData
    ) external {
        uint256 value = upshotAdapter.verifyData(upshotAdapterData);

        _protocolFunctionRequiringPredictionValue(protocolFunctionArgument, value);
    }

    function _protocolFunctionRequiringPredictionValue(uint256 protocolFunctionArgument, uint256 value) internal {
        // use arguments and value 
    }

Step by Step Guide:

  1. Create an Upshot API key by creating an account.
  2. Call the Adapter Index Prices API using the topicId found in the deployed topics list and the correct chainId. For example, if you use sepolia, you would provide ethereum-11155111.
  3. Construct a call to the Allora Adapter contract on the chain of your choice (options listed under deployments) using the returned signature and numeric_data as follows:

Creating the Transaction:

await alloraAdapter.verifyData({  
  signedNumericData: [{  
    signature: signature,  
    numericData: {
      topicId: topicId,
      timestamp: timestamp,
      numericValue: numericValue,
      extraData: extraData
    }
  }],  
  extraData: '0x'
})

AlloraAdatper alloraAdatper = AlloraAdatper(0x238D0abD53fC68fAfa0CCD860446e381b400b5Be);

SignedNumericData[] memory signedNumericData = new SignedNumericData[](1);

signedNumericData[0] = SignedNumericData({
    signature: signature,
    numericData: NumericData({
      	topicId: topicId,
        timestamp: timestamp,
        numericValue: numericValue,
        extraData: extraData
    });
});

alloraAdapter.verifyData(AlloraAdapterNumericData({
    signedNumericData: signedNumericData,
    extraData: ''
}));

Notes

  • The API endpoint uses snake_case, while the smart contract uses camelCase for attribute names.
  • Ethers.js does not accept '' for extraData. Empty extraData should be denoted with '0x'.

Code Links

Updated about 2 months ago