Check if the IP address is related to a bot that register accounts. It can also check usernames and emails. Initially free.
### [Hunter](https://hunter.io/)
Find and verify emails.
Some free API requests free, for more you need to pay.
Commercial?
### [AlientVault](https://otx.alienvault.com/api)
Find Malicious activities related to IPs and Domains. Free.
### [Clearbit](https://dashboard.clearbit.com/)
Find related personal data to a email \(profiles on other platforms\), domain \(basic company info ,mails and people working\) and companies \(get company info from mail\).
You need to pay to access all the possibilities.
Commercial?
### [BuiltWith](https://builtwith.com/)
Technologies used by webs. Expensive...
Commercial?
### [Fraudguard](https://fraudguard.io/)
Check if a host \(domain or IP\) is related with suspicious/malicious activities. Have some free API access.
Commercial?
### [FortiGuard](https://fortiguard.com/)
Check if a host \(domain or IP\) is related with suspicious/malicious activities. Have some free API access.
### [SpamCop](https://www.spamcop.net/)
Indicates if host is related to spam activity. Have some free API access.
### [mywot](https://www.mywot.com/)
Based on opinions and other metrics get if a domain is related with suspicious/malicious information.
### [ipinfo](https://ipinfo.io/)
Obtains basic info from an IP address. You can test up to 100K/month.
This platform give information about domains and IP addresses like domains inside an IP or inside a domain server, domains owned by an email \(find related domains\), IP history of domains \(find the host behind CloudFlare\), all domains using a nameserver....
You have some free access.
### [fullcontact](https://www.fullcontact.com/)
Allows to search by email, domain or company name and retrieve "personal" information related. It can also verify emails. There is some free access.