I made this data functionality after seeing a reddit comment mentioning how HUMA stock went up 40% in two weeks since the CEO filed their buy in SEC Form 4. I wrapped it up in a site and put a Stripe subscription on it after tuning the data pipeline. There's a 2 week free trial (no credit card required!!!)

Making the alerts get sent out in under a second has been one of the most challenging things. Amazon Simple Email Service and Simple Queue Service come in conjunction to provide the data we email.