Review My Startup: TweetHook - Twitter Search ping service
There are several levels of paid plans. There is no free plan mostly to avoid spammers/abuse, but also because I am running on a tight budget and don't have tons of cash to burn. I realize I may turn away potential users with this "paid only" barrier, but the users, developers, and businesses that would want this service should be willing to pay for it. I already have a few very happy clients from my beta testing phase that are sticking around as paid customers.
Please let me know what you think!