Ask HN: Best API to check for scam/phishing/spam domains?

[Daktest]

I'm building an app where the user has to input a domain as part of one of our user flows. For safety/security reasons, I want to integrate with an API that can check if the domain that the user has input is scammy, spammy, or contains other malicious content. I was looking into Scamadviser (https://www.scamadviser.com/scamadviser-api), but does anyone have recommendations for any other potential APIs or tools?

[verdverm]

The ad blockers also typically block these things. There are big lists that back them, typically open sources on GitHub.

You could check against the lists by wrapping in a simple API. You'll also be able to choose which lists and make exceptions or edits, as well as keeping them up to date

[sargstuff]

Api for domain policy enforcement/filtering typically handled by server/gateway service handling dns requests. (per nat'ing, local/non-local addressing, subneting, virtual addressing, etc).

aka app uses dns service. Typically, the gatway/server of dns service does appropriate checks per system/network administration setups/policies. Aforementioned dns service returns a 'failure to resolve' if domain/address doesn't meet 'valid/appropriate' policy/rules.

An application on a properly configured network / box should only have to verify an address/domain exists/reachable via dns lookup[1].

An application / non-server box / non-gateway box attempting to do this via other methods may be taken to be malicious / violate network policy of domain box running app is on.

From system/network administrator view, end user box suddenly starts using information related to malicious sites. aka system/network administrator sees 'information related to malicious sites' and not 'this a query to see if this information is related to a malicious site'.

Failtoban[2] / unbound[3] / dnsmasq[4] or BIND[5] are some programs run as system service which make use of dns queries to let an app know if domain is a 'do not use'.

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[1] : a) https://stackoverflow.com/questions/41060027/how-to-use-nslo...

      b) https://community.jisc.ac.uk/library/janet-services-documentation/how-block-or-sinkhole-domains-bind

[2] : fail2ban blacklisting : https://en.wikipedia.org/wiki/Fail2ban

[3] : unbound blacklisting : https://www.howtoforge.com/how-to-set-up-local-dns-with-unbo...

[4] : dnsmasq blacklisting : https://alblue.bandlem.com/2020/05/using-dnsmasq.html

[5] : BIND blacklisting : https://community.jisc.ac.uk/library/janet-services-document...