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

# Smart Contracts

## Zest Contracts

### ZestFeeCollector

The core protocol contract — routes user transactions through Zest to collect platform fees atomically.

|              |                                                                                                 |
| ------------ | ----------------------------------------------------------------------------------------------- |
| **Address**  | `0xC732Ac29e12D718407255bD4Be30B51d6b1b2CA3`                                                    |
| **Chain**    | Monad Mainnet (143)                                                                             |
| **Explorer** | [View on Monadscan ↗](https://monadscan.com/address/0xC732Ac29e12D718407255bD4Be30B51d6b1b2CA3) |

**Key functions:**

* `chargeFeeAndForward(target, data, value, volumeUsdE18, maxFeeMon)` — proxy call with fee
* `chargeFee(volumeUsdE18, maxFeeMon)` — pay fee only (2-step pattern)
* `quoteFee(volumeUsdE18)` → `(feeUsdE18, feeMonWei, fresh)` — read current fee quote

## Third-party contracts used

| Protocol          | Contract      | Address                                      |
| ----------------- | ------------- | -------------------------------------------- |
| Merkl Distributor | Claim rewards | `0x3Ef3D8bA38EBe18DB133cEc108f4D14CE00Dd9Ae` |
| Multicall3        | Batch reads   | `0xcA11bde05977b3631167028862bE2a173976CA11` |
| WMON              | Wrapped MON   | `0x3bd359C1119dA7Da1D913D1C4D2B7c461115433A` |
| USDC              | USD Coin      | `0x754704bc059f8c67012fed69bc8a327a5aafb603` |
| AUSD              | Analog USD    | `0x00000000efe302beaa2b3e6e1b18d08d69a9012a` |

## Security model

* Zest never holds user funds between transactions
* All fees are collected atomically in the same tx as the user action
* The `ea_access` cookie is httpOnly — Zest's frontend code cannot read it, only the server can
* Wallet connections are read-only until the user explicitly signs a transaction


---

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