---
title: "Create wallet sign-in challenge"
method: POST
path: "/api/auth/challenge"
---

# Create wallet sign-in challenge

`POST /api/auth/challenge`

## Request

- Base URL: `https://api.x402card.org`
- URL: `https://api.x402card.org/api/auth/challenge`
- Auth: none declared

## Request body

- object
  - `address` string, required
  - `preferredMessageSchemes` string[]

## Response `200`

Challenge message

---

[API](https://skmtc.dev/x402card/apis/x402card-virtual-cards-and-freeland-esim-api.md) · [All operations](https://skmtc.dev/x402card/apis/x402card-virtual-cards-and-freeland-esim-api/llms.txt) · [OpenAPI document](https://skmtc.dev/x402card/apis/x402card-virtual-cards-and-freeland-esim-api/revisions/90ffb84a664e?raw)