In a large bowl, whisk together the olive oil, stevia, lemon and lime juices, cider vinegar, chili powder, and salt.
Add tomatoes, black-eyed peas, beans, corn, red onion, and bell peppers. Stir to combine.
Stir in cilantro. Cover and chill at least 1 hour or overnight to blend flavors. Serve chilled or at room temperature.