keyword serp tracker

Looking for someone who preferably has already made a keyword tracker that i can integrate into my site. Looking to do this as a saas type setup. I am not sure how resource intensive this kind of thing gets so that is something i will need your assistance on. I see some people charge a lot of money to get this kind of data. Not a lot of money i am looking to spend just something i want to give away free to get traffic to sell my services. Needs to have a nice interface, some kind of graphs, keyword listings, current positions etc. I am hoping you know more than i do but i can show you examples of what i want but it doesnt have to be as complicated since this is a free service, just cant be crap. Respond with HELLO JIGGA so i know you have read this. Anyone else will be ignored.