Signup checks · REST API & MCP server
One API call tells you if an email is throwaway, an IP is a datacenter or Tor exit, or a phone number is VoIP, with a clear verdict: admit, review or refuse. Built for developers, and for the AI agents they ship.
1,000 free checks a month · no card · prepaid credits never expire
jane.doe+trial4@mailinator.com
disposable_domainmailinator.com hands out throwaway inboxes.plus_addressedUses a +tag, so one inbox can sign up many times.Each check returns a 0–100 score, a verdict and the reasons behind it, so you can explain a decision to a customer, a teammate or an agent.
Throwaway inboxes, typos like gmial.com, domains with no mail server, brand-new domains, shared team inboxes, +tag aliases, and (optionally) whether the mailbox exists.
disposable_domainpossible_typono_mail_serverdomain_newrole_accountmailbox_not_foundCountry and city, who owns the network, and whether it is a cloud server, a VPN-heavy network, a privacy relay or a Tor exit node.
tor_exit_nodedatacenter_ipvpn_networkprivacy_relayValid ranges for 245 countries, E.164 formatting, line type (mobile, landline, VoIP, toll-free, premium) and original carrier.
invalid_numbervoip_numberpremium_rate_numbercountry_mismatchWhether it exists, receives email, publishes SPF and DMARC, when it was registered, and whether its mail servers serve throwaway domains.
domain_not_founddomain_brand_newmx_shared_with_disposableAll of the above in one call, plus cross-checks: a phone from one country and an IP from another, or a throwaway inbox arriving from a server.
phone_ip_country_mismatchautomation_patternSend what you know about the signup. Read risk.verdict. Act on it. That's the whole integration.
Email, the visitor's IP, a phone number: any combination, from your server.
admit lets them in, review adds friction (verify email or phone), refuse blocks with a friendly message.
Every reason has a stable code and a sentence, ready for your admin panel or your agent's explanation.
curl https://veqen-app.com/v1/signup/check \
-H "Authorization: Bearer $VEQEN_API_KEY" \
-H "Content-Type: application/json" \
-d '{"email": "jane@mailinator.com", "ip": "185.220.101.1", "phone": "+14155552671"}'import os, requests
r = requests.post(
"https://veqen-app.com/v1/signup/check",
headers={"Authorization": f"Bearer {os.environ['VEQEN_API_KEY']}"},
json={"email": "jane@mailinator.com", "ip": "185.220.101.1", "phone": "+14155552671"},
timeout=10,
)
result = r.json()
print(result["risk"]["verdict"], result["risk"]["reasons"])const res = await fetch("https://veqen-app.com/v1/signup/check", {
method: "POST",
headers: {
Authorization: `Bearer ${process.env.VEQEN_API_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({"email": "jane@mailinator.com", "ip": "185.220.101.1", "phone": "+14155552671"}),
});
const result = await res.json();
console.log(result.risk.verdict, result.risk.reasons);{
"risk": {
"score": 99,
"level": "high",
"verdict": "refuse",
"reasons": [
{ "code": "disposable_domain", "impact": 90, "source": "email",
"message": "mailinator.com hands out throwaway inboxes." },
{ "code": "tor_exit_node", "impact": 85, "source": "ip",
"message": "This address is a Tor exit node." },
{ "code": "automation_pattern", "impact": 40, "source": "signup",
"message": "A throwaway inbox from a server or Tor network is the classic bot-signup pattern." },
{ "code": "phone_ip_country_mismatch", "impact": 15, "source": "signup",
"message": "The phone number is from US but the visitor is connecting from DE." }
]
},
"email": { "disposable": true, "did_you_mean": null, ... },
"ip": { "flags": { "tor": true, "hosting": false }, ... },
"phone": { "valid": true, "line_type": "fixed_line_or_mobile", ... }
}Veqen is an MCP server. Agents that qualify leads, onboard customers or clean CRM data can check every email, IP and phone number before they act, and explain why.
{
"mcpServers": {
"veqen": {
"type": "http",
"url": "https://veqen-app.com/mcp",
"headers": { "Authorization": "Bearer vq_live_..." }
}
}
}Tools: check_email_address · check_ip_address · check_phone_number · check_domain_name · check_signup_risk · get_balance
Start free. Top up with prepaid credits when you need more. No subscription, no minimums, and credits never expire.
Email, IP, phone and domain checks cost 1 credit. A full signup check costs 3. Mailbox verification adds 5. Full pricing →
No account needed. The same engine as the API, with a daily limit.
Paste an email address or a domain. We check it against thousands of throwaway providers, plus the mail server…
emailSee whether an address can receive mail, whether it's a typo, a throwaway inbox, a shared team inbox or a doma…
ipWe've filled in your own IP address. Paste any other IPv4 or IPv6 address to see where it is, who owns the net…
ipReal customers browse from home and mobile networks. Bots and abusers browse from servers. Paste an IP to see …
phonePaste any number. Include the country code (+44, +1...) or pick a country for local formats.
domainBrand-new domains are a favourite of scammers and throwaway inboxes. Paste a domain, URL or email address to s…
domainPaste a domain or an email address to see where its email goes.
signupFill in what you have. One verdict, with every reason behind it.
Copy-paste recipes for your framework and auth provider, written to run, not to read.
Email addresses (throwaway domains, typos, mail servers, domain age, mailbox), IP addresses (location, datacenter, VPN network, Tor), phone numbers (validity, line type, carrier) and domains. The signup check combines them into one verdict.
1,000 checks a month are free. After that you buy prepaid credits from $10 for 10,000 checks. Credits never expire and there is no subscription.
Yes. Veqen is an MCP server: connect it to Claude, ChatGPT, Cursor or any MCP client and the agent can run checks with your credits.
We log which check ran and what it cost, for your usage page, not the addresses, IPs or phone numbers themselves. The one exception: if you send an Idempotency-Key, we keep that response for 24 hours so a retry gets the same answer. Domain facts (mail servers, registration date) are cached per domain.