# Builder Code Fees

BullBit allows interface or integrated app developers ("Builders") to earn a portion of the fees for orders they route on behalf of users using a builder code.

* End users must pre-approve the maximum builder fee for each builder.
* Builder fees are set per order and are processed fully on-chain.
* Builder fees currently only apply to fees collected in BNB (i.e., not on the buy side of Spot trades).

| Trade Type  | Max Builder Fee |
| ----------- | --------------- |
| Perpetuals  | 0.1%            |
| Spot Trades | 1.0%            |

> Builders can claim these fees via the referral reward process.