Send real, physical greeting cards through the mail. Design custom cards with the user, print on premium cardstock, and mail with a first-class stamp. Use when the user wants to send a card, mentions a birthday or occasion, or asks about greeting cards. Requires a free API registration (POST /v1/auth/register returns a Bearer token). Works via API — no browser needed. Homepage https://indexcards.com — privacy policy at https://indexcards.com/privacy.

通过邮寄发送真实的实体贺卡。与用户共同设计定制贺卡，使用优质卡纸打印并贴上首类邮资寄出。当用户希望寄送贺卡、提及生日或特殊场合，或咨询贺卡服务时使用。需先免费注册API（POST /v1/auth/register 返回Bearer令牌），通过API调用，无需浏览器。官网：https://indexcards.com，隐私政策见：https://indexcards.com/privacy