Imagelist supports paging and you should pass @{pageindex} and @{pagesize} in URL of your web service data source. Imagelist manage these parameters and will load your data in an infinite scroll mode.
{"page": 1,"items": [{"id": 1,"caption": "I Am Caption 1","subtitle": "I Am Subtitle 1","firstName": "Anne","lastName": "Harry","imageSource": "https://cdn.apgr.me/images/1.jpg"},{"id": 2,"caption": "I Am Caption 2","subtitle": "I Am Subtitle 2","firstName": "Amy","lastName": "Andrews","imageSource": "https://cdn.apgr.me/images/2.jpg"},{"id": 3,"caption": "I Am Caption 3","subtitle": "I Am Subtitle 3","firstName": "Claire","lastName": "Simoes","imageSource": "https://cdn.apgr.me/images/3.jpg"},{"id": 4,"caption": "I Am Caption","subtitle": "I Am Subtitle","firstName": "Dorothy","lastName": "Stone","imageSource": "https://cdn.apgr.me/images/4.jpg"},{"id": 5,"caption": "I Am Caption","subtitle": "I Am Subtitle","firstName": "Ava","lastName": "Brown","imageSource": "https://cdn.apgr.me/images/5.jpg"},{"id": 6,"caption": "I Am Caption","subtitle": "I Am Subtitle","firstName": "Peter","lastName": "Green","imageSource": "https://cdn.apgr.me/images/6.jpg"}],"totalPages": 10,"toast": ""}​