Your math is off by 10x. $45,000 divided by 450,000,000 is $1 per 10,000 page views ie $0.10 per thousand. Also you should consider that website is hosting files that are fairly big. If the page size average 1MB, then that would be $0.10 per gigabyte of traffic. If page size average 2MB, then that would be $0.05 per gigabyte.

I don't know what rates usually would be considered fair.

Also the website was launched 3 months ago and it seems like he is saying that the website has had 450m in total. The bill would be for the current month probably? I would think most of the traffic came in the last month, but some of the traffic would have been on a different billing cycle.

Without more information, this is all speculation.