{"preview": true, "sample": [{"name_cn": "曹家渡五角场商圈核心", "address": "上海市静安区长寿路、万航渡路、长宁路、武宁南路、江宁路交汇处", "year_built": null, "building_type": "商业"}, {"name_cn": "曹家渡圣弥额尔天神堂（曹家渡天主堂）", "address": "上海市静安区万航渡路（原白利南路）一带", "year_built": 1920, "building_type": "文保"}], "total_buildings": 8, "message": "这是免费样本 (共 8 栋建筑可付费获取)。全量数据集请付费访问 /dataset/caojiadu (0.01 USDC via x402)。", "full_endpoint": "/dataset/caojiadu"}