x420.x420.app provides a minimalist DeFi trading API on the Base network that exposes a single endpoint (/api/puff) to buy exactly $5 USDC worth of x420 tokens. The endpoint performs a fixed-value token purchase (USDC → x420), returning on-chain transaction details suitable for wallets, bots, or backend services. Its single-purpose, predictable pricing and low per-call cost make it easy to integrate for onboarding flows, micro‑transactions, and automated purchasing.