# Smart Contracts

## Core Contracts

| Contract                   | Address                                                                                                                 |
| -------------------------- | ----------------------------------------------------------------------------------------------------------------------- |
| **BUCK Token**             | [`0xdb13997f4D83EF343845d0bAEb27d1173dF8c224`](https://etherscan.io/address/0xdb13997f4D83EF343845d0bAEb27d1173dF8c224) |
| **Liquidity Window**       | [`0x6E87adb23ac0e150Ca9F76C33Df2AdCae508548E`](https://etherscan.io/address/0x6E87adb23ac0e150Ca9F76C33Df2AdCae508548E) |
| **Liquidity Reserve**      | [`0x1A426E3a87368a4851f7443Ff656A054Af872f66`](https://etherscan.io/address/0x1A426E3a87368a4851f7443Ff656A054Af872f66) |
| **Policy Manager**         | [`0x79f86b9E0ac84C7580575089E453431D77905E36`](https://etherscan.io/address/0x79f86b9E0ac84C7580575089E453431D77905E36) |
| **Oracle Adapter**         | [`0xa6c5f4D041192C2019E77f679eA02e9684235Fd9`](https://etherscan.io/address/0xa6c5f4D041192C2019E77f679eA02e9684235Fd9) |
| **Rewards Engine**         | [`0x159c1C0F796a02111334cC280eE001b091a9580C`](https://etherscan.io/address/0x159c1C0F796a02111334cC280eE001b091a9580C) |
| **Collateral Attestation** | [`0x1aEEEf99704258947A9ea77eF021d5e0551c0428`](https://etherscan.io/address/0x1aEEEf99704258947A9ea77eF021d5e0551c0428) |
| **Access Registry**        | [`0xbCc6de2423B496cb36C3278dC487EfD9c5C550B6`](https://etherscan.io/address/0xbCc6de2423B496cb36C3278dC487EfD9c5C550B6) |

## Administrative Addresses

| Role                   | Address                                      |
| ---------------------- | -------------------------------------------- |
| **Admin Wallet**       | `0x376269214bB78b3D4f31d17600499b439c1aCB4b` |
| **Treasury Wallet**    | `0x5d105791469064cA0764cfaCfc577c286351CFAD` |
| **Distributor Wallet** | `0xC2a2dbBD627872E78894F3C1c403Fbe1cd4C36df` |
| **CAS Attestor**       | `0x6f31810c8e6bFaf3BA486B4b7ce651b023423Fa3` |

## Security

All contracts use the UUPS upgradeable proxy pattern and have been audited by Cyfrin, Spearbit, and SSC.

Admin wallet operations — including contract upgrades and configuration adjustments — are secured by a **Fireblocks 4/4 MPC approval system** with a TAP (Transaction Authorization Policy) and function-level whitelist. Every admin action requires approval from all 4 MPC key holders before it can execute, and only pre-approved contract functions can be called.

Treasury and Liquidity Reserve withdrawals/operations are also under a separate **4/4 MPC multisig** in Fireblocks. No single individual can unilaterally upgrade contracts, change protocol parameters, or move funds.

## Collateral Attestation

An off-chain attestor periodically publishes two values to the CollateralAttestation contract ([`0x1aEEEf99704258947A9ea77eF021d5e0551c0428`](https://etherscan.io/address/0x1aEEEf99704258947A9ea77eF021d5e0551c0428)):

* **Portfolio value (V)** — The current value of protocol-held STRC and other collateral
* **Haircut coefficient (HC)** — A conservative discount applied to the portfolio value

The contract computes the collateral ratio as:

```
CR = (USDC in Liquidity Reserve + haircutted portfolio value) / BUCK total supply
```

The protocol currently maintains a CR of **\~1.6x**, meaning there's $1.60+ backing every $1 of BUCK. If the attestation becomes stale (exceeds a configurable freshness window), mints and refunds are paused automatically until a fresh attestation is published.

For monthly attestation reports, see [Independent Reserve Attestations](https://buck-3.gitbook.io/buck-docs/safety-and-risk/reserve-attestations).

## Fees

| Action       | Fee            | Applied When                                         |
| ------------ | -------------- | ---------------------------------------------------- |
| **Mint**     | 10 bps (0.10%) | Minting BUCK from USDC via the Liquidity Window      |
| **Refund**   | 10 bps (0.10%) | Redeeming BUCK back to USDC via the Liquidity Window |
| **DEX Buy**  | 15 bps (0.15%) | Buying BUCK on Curve or Uniswap                      |
| **DEX Sell** | 15 bps (0.15%) | Selling BUCK on Curve or Uniswap                     |

All fees are sent to the protocol Treasury (`0x5d105791469064cA0764cfaCfc577c286351CFAD`). Fee rates are configurable by the admin via the PolicyManager contract ([`0x79f86b9E0ac84C7580575089E453431D77905E36`](https://etherscan.io/address/0x79f86b9E0ac84C7580575089E453431D77905E36)) and may change based on protocol health band.

## Resources

| Resource      | Link                                                                      |
| ------------- | ------------------------------------------------------------------------- |
| GitHub        | [github.com/buck-labs/buck-v1](https://github.com/buck-labs/buck-v1)      |
| Audit Reports | [View All](https://github.com/buck-labs/buck-v1/blob/master/docs/audits/) |

***

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