Indexer Samples

A reliable indexer combines HTTP backfill and WebSocket live sync. Use getSignaturesForAddress for history, logsSubscribe for live events, slot tracking for ordering, and finalized for durable checkpoints.

Concern	Pattern
Backfill	Page backwards with before cursors.
Live sync	Subscribe with logsSubscribe.
Slot tracking	Store slot with each event and reconcile gaps.
Finality	Process confirmed; commit permanent state at finalized.

warning

WebSocket streams are not historical replay. Resume from HTTP cursors after restart.