Hi, What you need is server polling or server push technique. There are many discussions about this topic. You have to decide having in mind the price update frequency, active users and so on. There are many frameworks(free and paid) that you can use to implement server push. In our app we are using lightstreamer - very powerful, but it also cost too much and the is no ready to use integration. So dig for some free solutions at first and if they face your needs use them. Also you may achieve something between polling and pushing using simple RPC. For example : send request for price update, on the server block until data is available and when it is return it and send the request again, that way the user makes requests only when it is needed. Regards.
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