---
title: "Check Username"
method: GET
path: "/v1/username/check"
tags: ["User"]
---

# Check Username

`GET /v1/username/check`

Check whether a username is available. Must match 3–20 chars, alphanumeric + underscores.

## Query parameters

- `username` string, required

## Response `200`

Availability result

- object
  - `data` object
    - `available` boolean

## Other responses

- `401` — Missing or invalid authentication

---

[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)