that's our paid plan but we do have a free tier! if you have something in mind and an interesting use case, hit me up and I can organise access for you.
hey there, i work for ipinfo.io and we have a privacy detection API (https://ipinfo.io/developers/privacy) that includes vpn/proxy/tor/hosting(bot, scrapes,etc) flagging which may help your predicament? You can test out how accurate we are by appending any nefarious IPs to our URL and see if we flag it correctly. e.g. https://ipinfo.io/5.62.18.115.
Not sure if that will be your magic bullet but will be happy to have a chat and riff on this. I've talked to customers that are using our privacy detection API and I do remember a good subset using it for your sort of use case. At the very least, I can pass on some learning, strategies, etc to combat it.