@substrate/api-sidecar is a RESTful service designed to simplify interactions with blockchain nodes built using Substrate’s FRAME framework. Compatible with Node.js versions 14 and above, Sidecar facilitates integration by providing endpoints for accessing blockchain data and operations, such as blocks and traces, while supporting various configurations through JSON-defined custom substrate types. It offers robust logging and metrics capabilities for performance monitoring, including Prometheus and Loki integration. With deployment flexibility via NPM, Yarn, and Docker, Sidecar caters to developers seeking efficient blockchain node interaction, contributing to the decentralized technology landscape through its open-source foundation.