> For the complete documentation index, see [llms.txt](https://docs.eggle.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.eggle.xyz/essentials/on-chain-operation.md).

# On-chain Operation

Eggle’s gameplay and economy are entirely driven by smart contracts, ensuring fairness, transparency, and automation. At the heart of this design are two primary contracts that define how players interact with their animals and claim rewards.

<figure><img src="/files/aOiGDsuMXF6viIcN3BFS" alt="Egg"><figcaption></figcaption></figure>

## **Health Check Contract**

The Health Check contract oversees the well-being of all Eggle animals. To keep their animal alive and growing, players send **10 ENG daily** to the animal’s **Token Bound Account (TBA)** rather than directly to the contract. This design deepens ownership and makes each animal a true on-chain entity.

<figure><img src="/files/I5HY1TPfuBV5tqmsj0FR" alt="full chicken"><figcaption></figcaption></figure>

If neglected, an animal’s health status will degrade step by step—**Full → Hungry → Weak → In Danger → Dead**. Once Dead, it remains an NFT but loses all utility: it can no longer be fed, revived, or exchanged for harvest rewards.&#x20;

This mechanic brings realism and responsibility into Eggle, rewarding only those who show consistent care.

{% content-ref url="/pages/ry4E7rhl2cnSyRyXEdSD" %}
[Phase 2 - Raising](/how-to-play/phase-2-raising.md)
{% endcontent-ref %}

{% content-ref url="/pages/eKebZoXGtW065fU3JvU1" %}
[Dead or Alive](/breakdown/dead-or-alive.md)
{% endcontent-ref %}

## **Treasury Contract**

The Treasury contract is the final stop in a player’s journey—where dedication is turned into tangible rewards.&#x20;

Once an animal reaches maturity in **Full** status, it can be sent to the Treasury contract. In return, the system distributes rewards directly to the player’s wallet, fully automated and trustless.

<figure><img src="/files/GY1wCGseZKDshqslxovQ" alt="swag chicken" width="374"><figcaption></figcaption></figure>

## **The Bigger Picture**

Together, the **Health Check contract** and the **Treasury contract** form Eggle’s on-chain core, weaving responsibility, reward, and transparency into a single loop.&#x20;

Every action—feeding, growing, harvesting—is fully recorded on-chain, turning Eggle into more than a game: it is a decentralized ecosystem where attention and commitment directly shape outcomes.

{% content-ref url="/pages/AClPWdvNFdRhHLbwv0J6" %}
[Phase 3 - Harvesting](/how-to-play/phase-3-harvesting.md)
{% endcontent-ref %}