# Reward index

Reward index helps to boost your NFT card rewards. You can collect different types of [NFT Cards](https://docs.shopnext.io/whitepaper/how-to-play/what-are-nft-cards-bonus-cards) to increase Reward index. See details of rewards calculation [here](https://docs.shopnext.io/whitepaper/how-to-play/rewards-calculation).

<figure><img src="https://3504352944-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fnm8vMlQqJcB2qckYK5LL%2Fuploads%2FLcO6FwmBRp6tTv3UCn5V%2Fimage.png?alt=media&#x26;token=96ea0efe-01a4-4033-99c3-c591b7e29e42" alt=""><figcaption></figcaption></figure>

<table data-header-hidden><thead><tr><th width="153"></th><th width="150"></th><th width="158"></th><th width="159"></th><th></th></tr></thead><tbody><tr><td><strong>Card type</strong></td><td><strong>Own an NFT Card</strong></td><td><strong>Parameter increased after each additional NFT Card</strong></td><td><strong>Max number of card to be calculated at each type</strong></td><td><strong>Max reward index at each type</strong></td></tr><tr><td>Bronze</td><td>5</td><td>+1</td><td>3</td><td>8</td></tr><tr><td>Silver</td><td>10</td><td>+2</td><td>3</td><td>16</td></tr><tr><td>Gold</td><td>20</td><td>+3</td><td>3</td><td>29</td></tr><tr><td>Platinum</td><td>35</td><td>+4</td><td>3</td><td>47</td></tr></tbody></table>

For example if Alex holds 2 NFT cards at the Bronze level, his reward index parameter is 6. If he owns 4 or more Bronze cards, his reward index will still be 8. If he manages to get 1 more silver card, his index will be increased to 8 + 10 = 18.  The maximum reward index for an account will be 8+16+29+47 = 100.