> For the complete documentation index, see [llms.txt](https://docs.scry.finance/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.scry.finance/docs/morpheus/contract-use-and-request-feeds/vrf.md).

# VRF

To request a Verifiable Random Function (VRF) feed, use the `requestFeeds` function with 'vrf' as the endpoint. Optionally, include a unique identifier or "salt" in the APIendpointpath to ensure each VRF, preventing potential influence by the oracle. The oracle will return the VRF as a 256-bit unsigned integer (uint256). Note that each request generates a unique feed ID, so for each new VRF, a separate `requestFeeds` call is required. More info in\
[https://docs.scry.finance/docs/morpheus/vrf-hash-ranch](#vrf)

**Sample**

<pre class="language-solidity"><code class="lang-solidity">// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface Morpheus {
    function getFeed(
        uint256 feedID
    )
        external
        view
        returns (
            uint256 value,
            uint256 decimals,
            uint256 timestamp,
            string memory valStr
        );

    function requestFeeds(
        string[] calldata APIendpoint,
        string[] calldata APIendpointPath,
        uint256[] calldata decimals,
        uint256[] calldata bounties
    ) external payable returns (uint256[] memory feeds);
}

contract VRF{
    Morpheus public morpheus;
    uint vrfID;
    uint oracleFee = 100000000000000;
    address winner;
    address player;
    constructor() {
        morpheus = Morpheus(0x0000000000071821e8033345A7Be174647bE0706);
    }

    function play() public{
     require(msg.value>=oracleFee);
    require(player==address(0));
   player=msg.sender;
     requestVRF();
    }


    function requestVRF() internal {
        string[] memory apiEndpoint = new string[](1);
        apiEndpoint[0] = "vrf";
        string[] memory apiEndpointPath = new string[](1);
        apiEndpointPath[0] = "";
        uint256[] memory decimals = new uint256[](1);
        decimals[0] = 0;
        uint256[] memory bounties = new uint256[](1);
        bounties[0] = oracleFee ;
        uint256[] memory feeds = morpheus.requestFeeds{value: oracleFee }(
            apiEndpoint,
            apiEndpointPath,
            decimals,
            bounties
        );
    vrfID= feeds[0];
    }

    function determineWinner() public {
        require(
            vrfID!=0
        );
        (uint256 vrfValue, , , ) = morpheus.getFeed(vrfID);
        require(vrfValue != 0, "Oracle not ready");
        uint256 roll = (vrfValue % 100) + 1;
        if (roll>51){winner=player;}
<strong>        player=address(0);
</strong>    }
}
</code></pre>

### **See for more info**

{% content-ref url="/spaces/v8JXJiVYHraB1HHgM4ge/pages/re987b0jDYi78WGmBYsr" %}
[VRF Hash RanCh](/docs/morpheus/vrf-hash-ranch.md)
{% endcontent-ref %}


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