I've recently taken on a few SEO clients. I've been doing SEO for my own sites for a while so am pretty good at it (they're all on the first page ) but I don't know how to charge my clients.
I want to charge them based on their rank for each keyword (ie. position 1 costs $500/month) etc., but I'm looking for some good software/a good site that will keep track of positions for me, and also charge the client accordingly if possible. Something like SEO powersuite but web-based, and with a built in function for calculating client bills based on the position.