We are building a Magento store in which silver, gold, platinum and palladium will be sold. We need our product prices to be calculated dynamically so they are always correct.
-Calculations must be: Product Price = precious metals price + markup
-We need a to acquire a precious metals api feed, preferably free, but must be correct and current at all times.
-Prices need to be updated continuously, but once a product is placed in the cart it should hold the same pricing for several minutes, long enough to complete the transaction.
-There should be some sort of fail-safe in case the API fails.
Please respond with a bid and project details and timing.