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Fender API

Stop the slop and noise

A trust & safety API that screens emails, domains, links, and content at your product's entry points — malicious accounts, phishing, and the rising wave of AI-generated reviews, emails, and submissions, caught in a single call.
Try it free Quickstart

The Fender API is a set of small, fast HTTP endpoints you can drop into signup, checkout, and messaging flows. Today the disposable email endpoint is live and free to try — no signup required. More endpoints are on the way.

Disposable email

Detect throwaway / temporary email domains. Live now. Read the docs →

Email risk

0–100 risk score for any address, with a signal breakdown. Live now. Read the docs →

NSFW content

Flag adult / NSFW domains. Coming soon.

More

Email validation, phishing URLs, category blocking. Coming soon.

How it works

Section titled “How it works”
  • Try instantly. Anonymous requests are rate limited (10/min) so you can test without an account.
  • Create an account with Firebase to mint API keys and get higher limits.
  • One base URL. Everything lives under https://api.fender.ai.
Terminal window
curl "https://api.fender.ai/v1/disposable?email=test@mailinator.com"
{
  "input": "test@mailinator.com",
  "domain": "mailinator.com",
  "disposable": true,
  "matched": "mailinator.com",
  "reason": "domain_on_blocklist"
}