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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.
Payment conversion is probably one of the simplest things you can have on your website. You don't even need to hire a developer, there are open source examples at your disposal you could essentially drag and drop. (eg. http://openexchangerates.github.io/money.js/)
NOTE:
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Hence, a higher number means a more popular project.