---
title: "Passkey auth start"
method: POST
path: "/auth/passkey/start"
tags: ["auth"]
---

# Passkey auth start

`POST /auth/passkey/start`

Start passkey authentication, returns options for startAuthentication

## Response `200`

Default Response

- object
  - `options` object, required
    - `challenge` string, required
    - `timeout` number
    - `rpId` string
    - `allowCredentials` object[]
      - `id` string, required
      - `type` 'public-key', required
      - `transports` union[]
        - union
          - 'ble'
          - 'cable'
          - 'hybrid'
          - 'internal'
          - 'nfc'
          - 'smart-card'
          - 'usb'
    - `userVerification` union
      - 'discouraged'
      - 'preferred'
      - 'required'
    - `extensions` unknown
  - `sessionId` string, required

## Other responses

- `400` — Default Response

---

[API](https://skmtc.net/blockmatic/apis/basilic-api.md) · [All operations](https://skmtc.net/blockmatic/apis/basilic-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/blockmatic/basilic-api/versions/b2c23a2d8170/schema)