All AMEX business cards give Open Savings auto cash rebates at Fedex on top of points.
http://www.americanexpress.com/opensavings/
It wont help me to pay my fedex invoices.
FedEx: Valid on FedEx Priority Overnight®, FedEx Standard Overnight®, FedEx 2Day®, FedEx Express Saver®, FedEx 1Day® Freight, FedEx 2Day® Freight, FedEx 3Day® Freight, FedEx International Economy® Freight, FedEx International Priority®, FedEx International Economy®, FedEx Ground®, FedEx International Ground®, and FedEx Home Delivery® services.
Discounted Services do not include Easy Packaging from FedEx, invoiced shipments, or international duties and taxes. Payment must be made at time of shipment. Discount not available on FedEx shipments originating from non-FedEx locations unless the method of payment is a FedEx account linked to an American Express® Business Card.
Maximum annual savings is $1,000 per Card account.FedEx Discount Program: Savings of 16% on FedEx Priority Overnight® and FedEx Standard Overnight® envelope, 10% on FedEx Priority Overnight and FedEx Standard Overnight packages and FedEx 2Day® and FedEx Express Saver®, 15% on FedEx International Priority® and FedEx International Economy®, and 5%-7% on FedEx 1Day® Freight, FedEx 2Day® Freight, and FedEx 3Day® Freight are all off the standard list rates. Savings of up to 12% on FedEx Ground® and up to 10% on FedEx Home Delivery® depending on shipment weight. Savings are exclusive of any surcharges, premiums, or special handling fees. Rates are not available to package consolidators. Eligibility for discounts is subject to FedEx credit approval. Discounts and availability are subject to change. FedEx discounts available to accounts with a US-based billing address only. To receive the 5% electronic shipping bonus discount, you must prepare a shipping label online at fedex.com or use one of the approved FedEx® electronic shipping solutions which include, but are not limited to, FedEx Ship Manager®, Passkey, FedEx Ship Manager® Enterprise, and FedEx® QuickShip. The 5% discount is available for FedEx Priority Overnight, FedEx Standard Overnight, FedEx 2Day, FedEx Express Saver, FedEx International Priority, FedEx International Priority® Freight, FedEx International Economy, and FedEx International Economy® Freight shipments.