rosetta-helium
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Indexer API
The Indexer API is an optional endpoint that allows users already using the Rosetta API to also perform more complex queries (such as searching for a transaction by hash or finding all transactions related to an account).
While blockhain-etl
processes the full chain by ingesting blockchain data into a Postgres database for complex querying, it is probably (?) too intensive for a simple indexer.
This likely has some crossover with the lightweight ETL work that some people are doing in DeWi.