GET https://api.liuwangcun.com/api/hanjing POST https://api.liuwangcun.com/api/hanjing { "tool": "rmb_cap", "text": "1234.56" } → "壹仟贰佰叁拾肆元伍角陆分" 未带付款凭证时返回 402 + Payment-Needed(含账单), Agent 完成支付后重放即得结果,全程无人值守。