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I've pretty much stated the entire question in the title:

I'm looking for an iPhone application that can call an online API (preferably RESTful but I'll accept anything) as a reaction to triggering a geofence.

So, as a stupid example, a tweet could be sent out automatically when I arrive at my house. The iPhone would see the geofence trigger, the application would be invoked, which would call the Twitter API to send the tweet.

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So kind of like boxcar but in reverse where the general program gets handed various API to call when a reminder is triggered? – bmike Nov 28 '12 at 0:45
Exactly. In fact finding something like Boxcar was the first part of what I needed. (I ended up going with Prowl). Now I want to be able to trigger events in my house (turning on the lights through a REST API, for example) when I pull up to the house. – OverloadUT Nov 28 '12 at 0:47
Perhaps someone in jailbreak land has hacked the reminders app since it has everything you want except an URL to call. – bmike Nov 28 '12 at 15:49

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