Methods and devices for gastrointestinal stimulation are disclosed. In one embodiment, disclosed is an electrical stimulator device that includes a circuit board and a battery contained within a base housing; a conduction element; and at least one electrode. In some embodiments, the stimulator base housing can be directly attached to a wall of a body lumen. In other embodiments, the stimulator base housing can be attached to a cuff or a sleeve device. In still other embodiments, one or more elements of the system are free-floating within the GI tract. The devices can be delivered endoscopically, and in some embodiments toposcopically.