---
title: "Begin passkey MFA verification during login"
method: POST
path: "/v1/auth/mfa/passkey/begin"
tags: ["Authentication"]
---

# Begin passkey MFA verification during login

`POST /v1/auth/mfa/passkey/begin`

## Request

- Base URL: `https://api.1claw.co`
- URL: `https://api.1claw.co/v1/auth/mfa/passkey/begin`
- Auth: none required

## Request body

- object
  - `mfa_token` string, required

## Response `200`

WebAuthn challenge

- PasskeyAssertBeginResponse
  - `challenge` string, required
  - `rp_id` string, required
  - `timeout` integer, required
  - `user_verification` string, required
  - `allow_credentials` AllowCredential[], required
    - `id` string, required
    - `type` 'public-key', required
    - `transports` string[]

## Other responses

- `400`: Invalid request

---

[API](https://skmtc.dev/1claw/apis/1claw-api.md) · [All operations](https://skmtc.dev/1claw/apis/1claw-api/llms.txt) · [OpenAPI document](https://skmtc.dev/1claw/apis/1claw-api/revisions/ae109b496830?raw)