Is there hava a cloud service to support Image Feature Recogition?

I want to implement a feature that you can scan an image of reality by your phone, you will generate a feature code from the image, and then upload it to cloud service. If the database of cloud service has this code, you can download something related to the image. Now, the main problem with me, I need a system or cloud service to help me to identify the images, I don't want to do too much things, so is there hava an existing cloud service to support me do that? Free or paid are ok.