API reference / Email verification

Look up an email domain

Written and maintained by The ProspectAPIs team

GET/v1/email/domain/:domain

GET /v1/email/domain/:domain is the ProspectAPIs operation emailDomain, in the Email verification group of the REST API. What DNS, our lists and our own recent checks know about a domain; no mail server is contacted. Free, 300 lookups an hour per account. Cost: free, 300 an hour per account. Send your API key as a Bearer token in the Authorization header.

How this fits with the rest of the email verification API, with worked examples, is in the email verification guide.

Parameters

Responses

Every error answers with the same JSON body, an error string and sometimes a code; the errors page lists each status and when it happens. A per-key 429 carries Retry-After; see rate limits.

200 response fields

The domain. The body is a EmailDomainInfo.

Code samples

Each sample sends the same request. Set PROSPECTAPIS_KEY in your environment first. Values come from the spec's examples; replace them with your own.

curl https://api.prospectapis.com/v1/email/domain/acme.com \
  -H "Authorization: Bearer $PROSPECTAPIS_KEY"

const res = await fetch("https://api.prospectapis.com/v1/email/domain/acme.com", {
  headers: { Authorization: `Bearer ${process.env.PROSPECTAPIS_KEY}` },
});
if (!res.ok) throw new Error(`${res.status}: ${(await res.json().catch(() => ({}))).error ?? res.statusText}`);
const data = await res.json();
console.log(data);

import os, requests

res = requests.get(
    "https://api.prospectapis.com/v1/email/domain/acme.com",
    headers={"Authorization": f"Bearer {os.environ['PROSPECTAPIS_KEY']}"},
    timeout=30,
)
res.raise_for_status()
data = res.json()
print(data)

Billing

This call is free: it never spends credits, so you can call it as often as the rate limit allows. Metered calls on the same key report your balance after each response in X-Credits-Remaining, and GET /v1/account shows it at any time.

Related

The email verification guide covers this area end to end. Previous operation: Find an email address. Next operation: What a score means. Every operation, grouped by area, is on the API reference index.

Create a free account to get a key, then run the samples above with your own values.