x402-api (x402-api.heyelsa.ai) is a compact REST API suite for token and DeFi operations on the Base network, exposing endpoints for portfolio retrieval, balance & price lookup, swap quoting/execution, token search, and transaction submission/monitoring. It supports end-to-end workflows—from searching tokens and obtaining swap quotes to executing swaps and tracking transaction status—making integration straightforward for wallets, trading bots, and portfolio trackers. Pricing is low-cost ($0.0010–$0.0200 per call) across eight core endpoints.