In large bowl, cream agave with butter until light and fluffy. Stir in pumpkin. Beat in eggs, one at a time, until thoroughly incorporated. Sift together remaining ingredients. Stir into pumpkin mixture. Divide batter equally between two well-greased 9 x 5 x 3-inch loaf pans. Bake at 350°F for 1 hour or until a wooden pick inserted in center comes out clean. Let loaves cool in pans for 10 minutes; invert pans to remove loaves and allow to finish cooling on racks.