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crowdsec
CrowdSec - the open-source and participative security solution offering crowdsourced protection against malicious IPs and access to the most advanced real-world CTI.
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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.
Not what you suggested but have you considered https://crowdsec.net? Not just a collaborative and more advanced version of Fail2Ban but in this case you want it because of the collaborative blocklist; we made an article showing that 92% of attacks was blocked in advanced by ip reputation before any attacks were performed. Disclaimer: I am head of community so I might be a bit biased. It’s still a cool FOSS project though :-)
We also have a PHP client library. We offer privacy detection service on the paid tier but you can just start by blocking the Tor exit nodes.