# Overview Referral is Market.Cards' invite and community-building mechanism. You can use your dedicated 8-digit invite code or invite link to invite friends who are interested in player cards and card markets to join the platform. We designed inviting to be self-reinforcing: when you share the players and cards you love, the act itself rewards you. There are two kinds of benefits: when a friend you invited completes eligible trades on the platform, you may earn Referral Earnings; in MintBox, you may also earn Lucky Digits through inviting, improving your chance of winning in that MintBox. {% hint style="info" %} **Important note** * Referral Earnings is a platform reward for **valid invite activity**. * Lucky Digit improves your chance of winning; it does not guarantee any allocation result. * Neither should be understood as investment income, guaranteed return, or a promise to preserve principal. {% endhint %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.market.cards/referral/overview.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.