01 - Combine the cubed watermelon, lime juice, and agave syrup in a blender. Purée until completely smooth.
02 - Pour the watermelon purée evenly into popsicle molds, filling each about two-thirds full. Gently tap the molds on the counter to release any trapped air bubbles.
03 - Place the filled molds in the freezer for approximately 1 hour, or until the surface is firm enough to support a second layer.
04 - While the watermelon layer sets, blend the sliced kiwi, lime juice, and agave syrup until smooth.
05 - Once the watermelon layer has firmed, pour the kiwi purée on top, filling each mold nearly to the rim. Insert popsicle sticks into the center of each mold.
06 - Return the molds to the freezer and freeze for at least 3 hours, or until the pops are completely frozen through.
07 - Briefly run the outside of each mold under warm water for a few seconds, then gently pull the pop free. Serve immediately.