I built JsonBlob[1], to help mock out JSON APIs so that building backends could be decoupled from front end development. I'd been needing this tool forever and then finally spent a weekend about 8 years ago building it out. I've been trying to find time to rebuild it with Kotlin and Micronaut, but just don't have the free time I used to have...
[1] https://jsonblob.com/
Looks like the DC part of the adapter is very tightly wound. It's not even visible coming out of the adapter itself. This looks like a good way to fray the cable.
"We charge less than we pay our upstream, but it's ok because we'll make it up in volume."
Seriously though, they're saying that most deployments use less than 18 hours per day, and if they just let them stay up 24/7 regardless of that, they're basically leaving money on the table. Heroku pays Amazon for all of what we're getting for free. Their free tier is a loss-leader.
If they don't spin down your app when it's idle, it absolutely costs them more than if they do. Regardless of how much (or even whether) they bill you for it.
I built http://jsonblob.com for this purpose. It has an HTTP API as well as we nice GUI interface to edit your JSON. It's open sourced and really just a thin webapp on top of mongo, so it's easy to run your own.
Yeah, it uses that for the editor, but also has a full HTTP API (http://jsonblob.com/api) behind it for storing the JSON and accessing it from outside the browser.