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productsAPI
Discontinued An open source, free to use API that serves fake products for quick prototyping. (by mar-cial)
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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.
You could use a rate limiter package like equalizer (note: i've never used this, just happened to see it the other day), or you could roll your own as a fun practice program. The TL;DR is that you identify users based on some metric, such as IP address, and then have a counter that tracks how many requests they make in a short period of time, and if they make over the threshold, you start returning 429 Rate Limit Exceeded errors.