URLminder lets you connect to Beeminder and set up a goal to beemind the number of words you publish at one or more publicly accessible URLs.

Connect to Beeminder

API

URLminder will (soon) refresh goals once per 24 hour period, but it might not do so at the time you want it to (like right before midnight in your time zone so that you don't derail).

You can trigger a refresh for any goal by issuing a GET to https://urlminder.herokuapp.com/[your-username]/[goal-slug]/refresh, so point cron at that (gently).

If that whets your appetite, URLminder is open source, so tinker away.