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Mashape allows you to consume and monitor APIs in your Application, giving you a one stop shop for monitoring, payments, and management.
Hacker League is a hackathon planning and organization tool. This API allows you to search hackathons and hacks from the Hacker League website.
If you want to find more APIs for your hacks, check out https://www.mashape.com/explore
Get your API keys & start hacking!