> ## Documentation Index
> Fetch the complete documentation index at: https://docs.zonk.fun/llms.txt
> Use this file to discover all available pages before exploring further.

# Base Builder Code

> ERC-8021 attribution on Zonk.fun frontend transactions.

| Setting            | Value                      |
| ------------------ | -------------------------- |
| Builder Code       | `bc_tea0a669`              |
| Base App ID        | `6a86d307abf0a9eb2b3c7565` |
| Encoding library   | `ox/erc8021`               |
| viem request field | `dataSuffix`               |

[ERC-8021](https://docs.base.org) provides transaction attribution through a data suffix. The frontend derives that suffix with `Attribution.toDataSuffix({ codes: [ZONK_BUILDER_CODE] })`.

The frontend first simulates the original contract request without attribution metadata. After simulation succeeds, `withBuilderCode(request)` adds the ERC-8021 `dataSuffix` to a copy of that request immediately before wallet submission. The original calldata, ABI arguments, value, slippage parameters, and destination remain unchanged.

Verified attributed write paths are:

* factory token creation;
* optional dev buy;
* curve buy;
* curve-token approval;
* curve sell;
* graduated-token approval;
* graduated Uniswap V3 buy or sell swap.

Builder Code is attribution metadata, not authentication or a security control.