---
title: "Start passkey sign-in."
method: POST
path: "/auth/passkeys/authentication/options"
tags: ["Account"]
---

# Start passkey sign-in.

`POST /auth/passkeys/authentication/options`

## Request

- Base URL: `https://animalchecklist.com/api/v1`
- URL: `https://animalchecklist.com/api/v1/auth/passkeys/authentication/options`
- Auth: none required

Creates discoverable-credential WebAuthn options and binds the challenge to an HttpOnly flow cookie for this browser.

## Response `200`

WebAuthn options for this browser operation.

- object

## Other responses

- `400`: Invalid input.
- `404`: Not found.
- `429`: Rate limited.
- `500`: Unexpected error.

---

[API](https://skmtc.dev/animalchecklist/apis/animal-checklist-api.md) · [All operations](https://skmtc.dev/animalchecklist/apis/animal-checklist-api/llms.txt) · [OpenAPI document](https://skmtc.dev/animalchecklist/apis/animal-checklist-api/revisions/0910760ad25b?raw)