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Northline WebKit Email Domain Check
x402
Northline WebKit Email Domain Check is a paid API for AI agents from northline-webkit.northline-c86.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Checks an email address or domain for deliverability, provider type (free/disposable), DMARC policy, and mail provider identity
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call web and domain utilities for AI agents: URL to Markdown, link preview metadata, links, uptime/redirect check, DNS, email-domain check, WHOIS/RDAP, robots.txt and a one-call domain report. x402 (USDC on Base), no API key, no signup.
Output
Returns a JSON object with: the normalized domain, whether it accepts mail, whether it is a free email provider, whether it is disposable, the detected mail provider name (e.g. 'Google Workspace'), the DMARC policy (e.g. 'none', 'quarantine', 'reject'), and an array of flags such as 'free_email_provider'.
Example use cases
Screen sign-ups for disposable emails
“Before we onboard this new user who signed up with user@guerrillamail.com, can you check if that email domain is disposable or from a throwaway provider?”
Verify sender domain before outreach
“I'm about to run an outreach campaign to leads from a list — can you check whether contact@acmecorp.io actually accepts mail and what mail provider they use?”
Audit email domain security posture
“Can you look up the DMARC policy and mail provider for the domain startup.io so I know how well they've set up their email security?”
Technical details
Endpoint
GEThttps://northline-webkit.northline-c86.workers.dev/v1/email/check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, no-signup, pay-per-call check on an email address or domain covering deliverability, provider classification, disposable detection, and DMARC policy in a single call. Prefer it over building your own DNS/MX/DMARC lookups when you want a unified result with provider identification (e.g. 'Google Workspace') and disposable-provider flagging without API key management.
Side effects
- Missing required 'email' query parameter returns an error
- Invalid or malformed email/domain string may return an error or incomplete result
- Domains with no MX records may return acceptsMail: false
- DMARC lookup may return partial data if DNS is unresponsive
- Payment failure via x402 prevents the call from completing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"dmarc": {
"policy": "none"
},
"flags": [
"free_email_provider"
],
"domain": "gmail.com",
"disposable": false,
"acceptsMail": true,
"freeProvider": true,
"mailProvider": "Google Workspace"
}
}Tags
x402
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