> For the complete documentation index, see [llms.txt](https://docs.yecho.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.yecho.app/yecho-protocol/smart-contracts.md).

# Smart Contracts

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### 🛠️ License

Al that smartcontracts are licensed under **BSL 1.1**.\
The code is source-available and may be commercialized under specific conditions.

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🔹**Yecho Subscription Manager**

*Smart contract that registers Yecho users and is required to start tracking income for their address.*

* Base: `0x932d172b02e0196e67886013e6876b5647af85a8`

* **MulticallV3**

<table><thead><tr><th width="113">Chain</th><th>Address</th></tr></thead><tbody><tr><td>Citrea</td><td><code>0x69582196A3aB310a38846B31a11c751E735D6fdc</code></td></tr></tbody></table>

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### ⚠️ Deprecated

#### 🔹 Subscription Contract

* **Yecho Subscription Manager**
  * Base: `0xC73523D86Bf7C75a9d6f9859BF08C4c4b71e904a`