Tellor Functions

Available Tellor Functions
When your contract inherits the usingtellor helper contract, it has access to the following functions:
retrieveData
Retrieves a specific value by queryId and timestamp
function retrieveData(bytes32 _queryId, uint256 _timestamp)
        public
        view
        returns (bytes memory);
isInDispute
Determines whether a specific value with a given queryId and timestamp has been disputed
function isInDispute(bytes32 _queryId, uint256 _timestamp)
        public
        view
        returns (bool);
getNewValueCountbyQueryId
Returns the total number of values submitted for a given queryId
function getNewValueCountbyQueryId(bytes32 _queryId)
        public
        view
        returns (uint256);
​
getTimestampbyQueryIdandIndex
Returns the timestamp at a specific index for a given queryId.
Values start at the 0 index
function getTimestampbyQueryIdandIndex(bytes32 _queryId, uint256 _index)
        public
        view
        returns (uint256);
​
getCurrentValue
Finds the most recent submission for a given queryId and returns 3 things: a boolean for whether a value was found, the value itself, and a timestamp of the value
Note that this function should not be used in most cases since it does not include a dispute buffer time. 
function getCurrentValue(bytes32 _queryId)
        public
        view
        returns (
            bool _ifRetrieve,
            bytes memory _value,
            uint256 _timestampRetrieved
        );
​
getDataBefore
Finds the most recent submission for a given queryId before a specific timestamp
It is recommended that you use this function with a buffer time when retrieving oracle values.  This allows time for bad values to be disputed.
function getDataBefore(bytes32 _queryId, uint256 _timestamp)
        public
        view
        returns (
            bool _ifRetrieve,
            bytes memory _value,
            uint256 _timestampRetrieved
        );
​