The WEX Bank is a fuel card from WEX Bank. The annual fee is No setup, annual or card fees. Rewards: Rebates per gallon at Exxon and Mobil branded stations by monthly gallons: 1-500 1 cent; 500-3,999 3 cents; 4,000-6,999 4 cents; 7,000-9,999 5 cents; 10,000+ 6 cents. Loan terms: Pay in full or carry a monthly balance (revolving credit option available).