Catch "[email protected]" at signup: email validation with typo suggestions

A surprising share of signup emails are just typos: gmial.com, hotmial.com, yaho.com. Those users never get your welcome email, and they quietly churn. One API call at signup fixes most of it.

Request

const r = await fetch(
  "https://webkit-email-validator-link-preview-article-extractor.p.rapidapi.com/email/[email protected]",
  { headers: { "X-RapidAPI-Key": KEY,
               "X-RapidAPI-Host": "webkit-email-validator-link-preview-article-extractor.p.rapidapi.com" } });

{"email": "[email protected]", "verdict": "risky", "score": 70,
 "did_you_mean": "[email protected]",
 "checks": {"syntax": true, "mx_found": true, "disposable": false,
            "role_account": false, "free_provider": false}}

Show "Did you mean [email protected]?" under the field and you've rescued a user.

What it checks

• Syntax and MX records (can the domain actually receive mail?)
• Disposable/burner domains for trial-abuse filtering
• Role accounts like info@ and admin@ for B2B lead scoring
• Typo suggestions for the big providers

Same API, two more tools

• /url/preview returns the title, description, image and favicon for link cards (chat apps, CMSs).
• /url/extract returns the clean article text from a URL, which is handy for summarisers and RAG.

Free tier: 200 calls/month. WebKit on RapidAPI