Stop the slop
and the noise.
Malicious signups, phishing, and a rising flood of AI-generated reviews, emails, and submissions are burying your real users in noise. Fender is the API that catches it — scoring emails, domains, links, and content in a single call, before any of it reaches your product.
{
"score": 92,
"risk_level": "high",
"signals": [
"disposable_domain",
"random_local",
"no_mx"
]
}
Your sign-up form is the front door.
Anything that lets a stranger create an account, send a message, or post content inherits an abuse problem. The attackers are automated now — and increasingly, so is what they write. Fender scores each one at the door.
Malicious accounts & agents
Fraudulent and throwaway signups — disposable and burner emails, role mailboxes, recycled domains, bot- and agent-driven registrations — created only to abuse free tiers, scrape, or spam. Scored and stopped before the account exists.
Phishing & malicious email
Phishing went pro: LLMs now write cleaner lures and spin up lookalike domains at scale. We turn models against them — scoring links and outbound email for intent, not just blocklists — to catch more and cut the wave of noise.
AI-generated reviews & submissions
A flood of LLM-written reviews, emails, applications, and support tickets is burying the real ones. Fender scores how likely text is machine-generated and catches coordinated bursts — so your team only sees what's worth their time.
One API call.
A clear verdict.
Send an email, domain, URL, or block of text. Get back a score and the exact signals behind it — fast enough to run inline on every signup and submission. Here's what that looks like in practice.
A growing suite of
detection endpoints.
Start with the live endpoints today — free, no signup. Each one is a single HTTP call you can drop into a signup flow, a form handler, or a moderation queue. More land as we build.
Disposable email detection
Instantly tell whether an email or domain belongs to a throwaway provider. Thousands of domains, refreshed continuously — the cheapest way to stop burner accounts at the door.
Email risk scoring
A 0–100 score from a dozen signals — disposable domains, role accounts, random local-parts, lookalike domains, high-abuse TLDs, and a live MX check — with a transparent breakdown.
LLM phishing & email detection
Phishing links and malicious outbound email, scored by language models — not just blocklists. We read intent, lures, and lookalike domains to catch what rules miss and strip out the rising wave of AI-written noise. (Malware & NSFW URLs too.)
AI-generated content detection
Spot LLM-written reviews, emails, applications, and form submissions, and catch coordinated bursts — so your team spends its time on real users instead of machine-generated slop.
Every product with a signup form, an inbox, or a submit button is drowning in slop — malicious accounts, phishing, and AI-generated reviews and emails. Fender is the API that filters it out, in a single call.
Stop the slop,
in one call.
Test any email or domain right now — free, no signup. When you're ready, create a key and drop Fender into your signup flow in an afternoon.