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This question already has an answer here:

How I can call method my contracts without synchonize? Synchronize is long and has big size. Language: Python or Javascript

marked as duplicate by carver, lungj, Richard Horrocks, Ismael, Badr Bellaj Aug 28 '17 at 23:07

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You can use a service like infura.io that provides public nodes. You have to register and they generate a url you can use from your application.

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