I just received a notice from X-Cart that they have released patches
[quote]USPS API update patches (RateV4 and IntlRateV2)
Dear X-Cart Customer,
We received a notice from the USPS regarding their new APIs named RateV4 and IntlRateV2. The USPS notice states that “Rate, RateV2, RateV3 and IntlRate will be retired in [COLOR=Red]May 2011[/COLOR], requiring all integrators to migrate to the latest versions”.
Therefore, we have released the update patches which will help X-Cart users to update their carts and migrate to the new APIs RateV4 and IntlRateV2.
The USPS API update patches are available for the following X-Cart versions: