---
title: "Update Username"
method: PUT
path: "/v1/username"
tags: ["User"]
---

# Update Username

`PUT /v1/username`

Change the authenticated user's display name. Must be 3–20 characters, alphanumeric and underscores only.

## Request body

- object
  - `username` string, required — New username (3–20 chars, alphanumeric + underscores).

## Response `200`

Username updated

- object
  - `data` object
    - `username` string

## Other responses

- `400` — Validation error
- `401` — Missing or invalid authentication
- `409` — Resource conflict (duplicate, already taken, invalid status transition, etc.)

---

[API](https://skmtc.net/totalistrading/apis/totalis-rfq-api.md) · [All operations](https://skmtc.net/totalistrading/apis/totalis-rfq-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/totalistrading/totalis-rfq-api/revisions/b0adb9a590b4/schema)