This API is in private preview. Endpoint availability and response schemas may change before general availability.
Use the intended chain endpoint to query a recent cursor with hl_getLatestBlocks, persist the last processed block height, then use batch block lookup to repair gaps. The Chain API does not introduce a separate per-chain authentication page; each method's intended request contract is documented with its reference.
For enriched account data and purpose-built market streams, continue with the HyperCore Data API getting started guide.