Rate / freight calculator for a joomla website

We need a rate/Freight price calculator for a POBOX website The calculator basically must calculate the tariff for shipping items by DHL, FEDEX, USPS, CARGO, OCEAN, basically getting the measures of the box to be shipped, the desination country, the kind of items, we have an API to get the process from DHL, FEDEX and USPS, but we need increase the price to the price obtained from API and send the increased price to the customer side of browser. Also we need quote the price of ocean freight of vehicles, and big merchandice by ocean. and AIR cargo, using some variables as type or merchandice, location and destination This must be developed as an Joomla 2.5 extension, to integrate with our website This must use interconection with MySQL and Firebird databases