Best Blockchain APIs for Developers in 2026: Expert Review

Every crypto product sits on a blockchain API. A wallet that shows a balance calls one. A trading bot calls two or three. An AI agent that answers "what is in this wallet" calls one through MCP. Four layers do that work. Node providers expose raw chain state over RPC. Indexers turn raw logs into queryable tables. Data APIs return priced, decoded, ready-to-render values. Swap rails move assets between chains and venues. Most production stacks co…