https://docs.polkadot.com/chain-interactions/query-data/query-rest/
Query On-Chain State with Sidecar REST API | Polkadot Developer Docs
Learn how to query on-chain state on Polkadot using the Sidecar REST API with curl, including account balances, asset data, and block information.
sidecar rest apion chain
https://docs.polkadot.com/reference/tools/sidecar/
Sidecar REST API | Polkadot Developer Docs
sidecar rest apideveloper docspolkadot