These two cards are known for being the best for Amazon ads because they earn unlimited 2x points.

Capital One Venture X Business • Unlimited 2x points, 150,000 welcome bonus, 5X on flights, 10X on hotels and rental cars, annual $300 credit for bookings through Capital One Travel, 10,000 bonus miles every year, $395 annual fee.
Capital One® Spark® Miles for Business • Unlimited 2x points, 50,000 welcome bonus, $95 annual fee ($0 first year).

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