real time UPS shipping cost estimator

I'm developing an online store using .NET. I come to the point where I need to take care the shipping and handling cost.

I wanted to be able to inform the user how much they will be charged for the shipping and handling (just like when you're about to buy a book from amazon.com).

Let's say I know:
- the size and weight of the product that I'm shipping,
- the destination zipcode

does any one know what API or web service that I can use to find out the UPS shipping cost at real time? (much more like credit card validation, but it's for shipping)

Thanks

 

 

 

 

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