---
title: "POST /v4/auth/login"
method: POST
path: "/v4/auth/login"
tags: ["Authentication"]
---

# POST /v4/auth/login

`POST /v4/auth/login`

Authenticate a user and set a JWT cookie for session management.

## Request body

- object
  - `address` string, required
  - `message` string, required
  - `signature` string, required
  - `chainId` number — Chain ID of the wallet

## Response `200`

Response for status 200

- object
  - `success` boolean, required — Whether login was successful
  - `token` string — JWT token for Authorization header — only returned in development for cross-site cookie fallback

---

[API](https://skmtc.dev/merkl/apis/merkl-api.md) · [All operations](https://skmtc.dev/merkl/apis/merkl-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/merkl/merkl-api/revisions/b7784c9a78b9/schema)