I've not paid a cent so far, but if the above is correct I'll have to go back to unplugging before 30 minutes is up. I may try another 45 minute night session, just to see. Then as the weather warms back up I'll return to L-2/L-2 charging only.
I haven't paid a cent either since I've never used EVgo yet.
In fact, ever since I started driving an EV at end of July 2013, I've yet to pay even a penny for any paid public or workplace charging.
My current Leaf has no CHAdeMO and I hope to sell it within the next month or so. My new Bolt has SAE Combo so I might be using that inlet... Will be looking for cheaper stations, where possible. But, over here in the Bay Area, it seems that EVgo is one of the more common SAE Combo providers, if not the most common.