Set expectations first, because this one is not what the rest of the list is.
Spaw is a verification API. It checks whether an email address, a phone number, an IP address, a postal address or a company identifier is genuine, from a single key and a single credit balance.
That is the other side of the proxy business, and understanding it makes you better at the first side.
Why This Belongs in a Proxy Discussion
Everything in this series is about presenting an address to a website. Spaw is about a website deciding whether to believe you.
The IP verification endpoint is the direct connection. It checks whether an address belongs to a datacenter, a hosting provider, a VPN, a residential connection or a mobile carrier, and returns a verdict.
That is precisely the check that decides whether your proxy works. Seeing it from the other side tells you what you are actually being judged on, which is more useful than any vendor's description of their own pool.
Verdicts That Name Their Reasons
The feature worth highlighting is that every answer explains itself and cites its sources.
Most verification services return a score. A number between zero and a hundred, with no indication of why.
That is close to useless when you need to act on it. A score of sixty tells you nothing about whether the problem is fixable, and gives you nothing to appeal or investigate.
Naming the reason and the source turns a verdict into information. You can see what triggered it and decide whether it matters.
Cross Checking Signals Against Each Other
The more interesting capability is checking signals against each other rather than individually.
An email address that looks fine and a phone number that looks fine can still be implausible together, because they point at different countries or different people.
That is exactly how modern detection works, and it is the same principle that catches out proxy users. A mobile address paired with a desktop fingerprint and a timezone from a third country does not hold together, and inconsistency is what gets noticed.
Six Endpoints, One Credit Pool
Email, phone, IP, address, company and cross checks, all through one key with one balance and plain REST responses.
There are ten free lookups a month, with paid tiers starting in single figures. That free allowance is enough to test the IP endpoint against addresses you already use.
Who It Fits
Spaw suits anyone building signup or fraud checks, teams who want to understand how their own addresses are being judged, developers wanting one key across several verification types, and anyone frustrated by opaque risk scores.
Who Might Look Elsewhere
If you want to buy proxies, this sells none. It is the opposite product.
If you need bulk verification at very large scale, check the credit pricing against your volume carefully.
Final Verdict
Spaw is a well built verification API that happens to be extremely educational for proxy users.
Six endpoints under one key, cross checking between signals, verdicts that name their reasons and sources, plain REST and a free monthly allowance.
Run your own proxy addresses through the IP endpoint before you do anything else. Seeing what a detection system actually says about them will teach you more than any review, and our proxy checker covers the connection health side.
