curl --request GET \
  --url https://openrouter.ai/api/v1/key \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "byok_usage": 17.38,
    "byok_usage_daily": 17.38,
    "byok_usage_monthly": 17.38,
    "byok_usage_weekly": 17.38,
    "creator_user_id": "user_2dHFtVWx2n56w6HkM0000000000",
    "expires_at": "2027-12-31T23:59:59Z",
    "include_byok_in_limit": false,
    "is_free_tier": false,
    "is_management_key": false,
    "is_provisioning_key": false,
    "label": "sk-or-v1-au7...890",
    "limit": 100,
    "limit_remaining": 74.5,
    "limit_reset": "monthly",
    "rate_limit": {
      "interval": "1h",
      "note": "This field is deprecated and safe to ignore.",
      "requests": 1000
    },
    "usage": 25.5,
    "usage_daily": 25.5,
    "usage_monthly": 25.5,
    "usage_weekly": 25.5
  }
}