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I am comparing API results with the results from the website. The website consistently returns results that are usually less, but almost always very different, than the ones the API returns for the exact same boxes and destination.

For example: with a 6x5x4 box weighting 1 pound going to 92120 with a value of $86.00 and HS Code 8708.29.00

API Results: UPS - Ground - $15.20; FedEx - Home Delivery - $15.04; USPS - Priority Mail - $8.79

Website Results: UPS Ground - $9.33; FedEx - Home Delivery - $16.05; USPS - Priority Mail - $9.35

As far as I can tell I am passing everything through the request as entered in the website. I have also tried but with and without the apply_shipping_rules flag set. This changes the API return values but does not correct the problem.

Can anyone tell me how to find out why these discrepancies are happening?