---
title: "Create Builder Code"
method: POST
path: "/user/builder-code"
tags: ["user", "builder"]
---

# Create Builder Code

`POST /user/builder-code`

## Request

- Base URL: `https://api.qfex.com`
- URL: `https://api.qfex.com/user/builder-code`
- Auth: API key in header `x-qfex-hmac-signature` and API key in header `x-qfex-nonce` and API key in header `x-qfex-public-key` and API key in header `x-qfex-timestamp`

Create the authenticated user's builder code. The code is generated server-side as a UUID and stored with active=true. Specify both QFEX and builder fee shares in basis points; they need not sum to 10000. QFEX share must be at least 5000 (50%), builder share must be >= 0, and their sum must be at most 10000. After create, reload builder-code mappings on clearing house.

## Query parameters

- `api_version` string

## Request body

- CreateBuilderCodeRequestBody
  - `$schema` string, uri: A URL to the JSON Schema for this object.
  - `builder_fee_share_bps` integer, required
  - `qfex_fee_share_bps` integer, required

## Response `200`

OK

- BuilderCodeDetails
  - `$schema` string, uri: A URL to the JSON Schema for this object.
  - `builder_code` string, required
  - `builder_fee_share_bps` integer, required
  - `builder_fee_share_percent` number, double, required
  - `created_at` string, date-time, required
  - `qfex_fee_share_bps` integer, required
  - `qfex_fee_share_percent` number, double, required
  - `updated_at` string, date-time, required

## Other responses

- `default`: Error

## Changes

- **2026-11-03** `0c23dfc24573`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/qfex/apis/qfex-rest-api/changes/user/builder-code/post.md)

---

[API](https://skmtc.dev/qfex/apis/qfex-rest-api.md) - [All operations](https://skmtc.dev/qfex/apis/qfex-rest-api/llms.txt) - [OpenAPI document](https://skmtc.dev/qfex/apis/qfex-rest-api/revisions/0c23dfc24573?raw)