The last case study in the book brings in evidence all token ecosystem considerations across market, mechanism, token, and bonding curve designs at once. We will demonstrate the interplay among all design pillars in a working, mature ecosystem, and thus prove the practical usefulness of an end-to-end Design Framework approach, as promulgated in Chap. 4 . We will also explain how functional and non-functional requirements evolution (and parallel advances in blockchain and other technology platforms) across protocol generations can be accommodated in a controllable manner by following this approach. The focus of the end-to-end design case study will be ‘Aave‘[1], which is currently among the top DeFi lending and borrowing ecosystems by token market capitalization [2].