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What is a "TCP monitoring tool with a REST interface?" Do you want a TCP proxy, or a system telemetry tool to report TCP related metrics?

I don't see why you would want to apply REST to a proxy unless you mean using REST to create filtering/interception rules. Using REST for a telemetry tool might be a good solution.

If you need packet filtering, there are tons of TCP proxy solutions out there. Maybe try this: https://github.com/ickerwx/tcpproxy

If telemetry is what you're after, maybe have a look at OSQuery (https://osquery.io/) from Facebook.

You might want to look at flows instead of packets. Maybe google ipfix or netflow for tools. Unless you are talking about firewall or other settings I don't think REST and packet monitoring would be a good fit.

Can you elaborate on the API that you need? To create checks?

Ask HN: Simple TCP Monitoring