{"initial_usd": 20.0, "spent_usd": 0.2324, "balance_usd": 19.77, "note": "初始$20；spent=昨日$0.16 + 今早8-20补发$0.0724（用户要求记入）；此后每篇扣实际成本；网页公开版不显示余额", "updated_at": "2026-08-20 09:00"}