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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I'm a huge fan of https://hop.exchange. I've had a bunch of talks with the founders, Chris and Shane, and I find them to be highly aligned with Ethereum values. I honestly don't know if it's cheaper (?) but I do know that "cheapest" and "best" aren't always the same.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.