# Earn

Only users who hold building NFTs can receive OMC as daily rental income. The amount of OMC received depends on the grade of the building NFT, and the grade of the building NFT is affected by fluctuations in the actual transaction price of the building and the trading price in the NFT market.&#x20;

{% hint style="info" %}
The quantity of rental income by grade may be changed through a half-life period based on the circulation of OMC within the service.
{% endhint %}



|  Rating | Daily rental income |
| :-----: | :-----------------: |
| 6 stars |       1.84 OMC      |
| 5 stars |       0.92 OMC      |
| 4 stars |       0.46 OMC      |
| 3 stars |       0.31 OMC      |
| 2 stars |       0.21 OMC      |
|  1 star |       0.14 OMC      |



Please refer to the link below for more information on building NFT grades and rental income systems.

{% content-ref url="../../platform/core-systems/property-nft-rating-system" %}
[property-nft-rating-system](../../platform/core-systems/property-nft-rating-system)
{% endcontent-ref %}

{% content-ref url="../../platform/core-systems/rental-reward-system-own2earn" %}
[rental-reward-system-own2earn](../../platform/core-systems/rental-reward-system-own2earn)
{% endcontent-ref %}
