Link Building Website

  Right now am working on a link building website in C# ASP.net plat form.So,i need the API for getting
1.page rank,
2.Search Engine Rank
3.Domain Age,
4.Back Links information for any particular website.

Please give me some API those can perform according to my requirements as soon as possible...because i need it urgent.




Sourav Bikash Adhikari.