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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.
Have a look at https://checklyhq.com. We do exactly that, API monitoring. You can set up a check that parses your API response and validates a specific field. We also have a free plan. Disclaimer: I’m the CTO.
NOTE:
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Hence, a higher number means a more popular project.