We also offer one, except for free: https://guard.certly.io

Not sure why they're binding this to the AWS Marketplace. Safe Browsing is also free, though I'm not sure how comprehensive it is.

Free but not free if you hit the limit:

"5,760 checks/day"

That's $1500 on f-secure

My math says $190 with 1 URL in a request or $38 with batching.

Wow. So they're offering a reputation check for URLs at 3 cents a pop. That seems rather steep, compared to the free SafeBrowsing API. Anything I'm missing?

I don't know if there's any functional difference, but the obvious difference is that the SafeBrowsing API has volume limits in place which might affect you if you're running a high-ish volume service:

  If you use the Safe Browsing APIs (v4) to warn users about unsafe web resources, the following restrictions apply:
    Lookup API (v4): You can query up to 500 URLs in a single POST request.
    Lookup API (v4) and Update API (v4): A single API key can make requests for up to 10,000 clients per 24-hour period.