The issue here is likely that you've run out of quota in our free plan. The console will be affected by this, unfortunately :(
You can verify this by performing any request (or looking in the developer console) and seeing a
402 which means you've exceeded your quota. Just upgrade your plan to a paid plan or wait until the quota refreshes (midnight PST).
We're working on a better error message here, since it's obviously not a great experience to see nothing.