Email verification API: pricing and code samples

Monthly cost of API volume, by vendor

Lowest published route for that many checks a month, read from each vendor's pricing page. Ours is the cheapest of our plans for that many API calls on monthly billing, including its per-1,000 price. Validation-API vendors and verifiers with an API are both listed. Vendor prices read 12 Oct 2026 to 5 Nov 2026. Each vendor links to its comparison page, which records the date its prices were read. Check their site for current pricing before you buy.

SimpleVerifier facts: prices, packs and limits

What it is

Email verification with a real SMTP mailbox check: each address comes back valid, risky or invalid with a reason. Includes an email finder on Pro and up.

Price per check

Starter $9/mo for 2,500 ($3.60 per 1,000); Pro $39/mo, 100,000 a month at full speed ($0.39 per 1,000 when used), then slower, never cut off. Business $99/mo with 300,000 at full speed; Agency $249/mo with 750,000 at full speed.

One-time packs

10,000 for $15 ($1.50 per 1,000); 25,000 for $29 ($1.16 per 1,000); 50,000 for $49 ($0.98 per 1,000); 100,000 for $79 ($0.79 per 1,000); 250,000 for $169 ($0.68 per 1,000). Credits never expire, run at standard speed, CSV verification only (no API or finder).

Free checks

First 100 email checks free with a Google sign-in, no card, once per account. Single checks on the free email checker need no account.

Billing

Monthly subscription, cancel anytime (yearly billing optional). One-time packs are listed above. Starter allowances reset monthly and do not roll over.

Speed today

One sending IP today, shared by every customer: about 13,000 mailbox checks a day in the standard lane. Bad syntax, dead domains and disposable addresses return at once; a list of 100,000 takes days, not hours, and each job shows its estimated finish time.

Catch-all handling

Catch-all (accept-all) addresses stay risky, never valid, and are graded higher, medium or lower likelihood with the reasons. Anything a mail server does not confirm is risky.

API and MCP

REST API on Pro, Business and Agency (Pro includes 10,000 calls a month, then $1.50 per 1,000). Remote MCP server with 6 tools for Claude, ChatGPT, Cursor and VS Code. No API on Starter.

Integrations

Connects to Instantly, Smartlead, HubSpot and Mailchimp by API key: verifies a campaign or list and tags each contact with its result. CSV in and out for any other tool.

Phone

Free phone format checks (country, type range). Live carrier and line-type lookups come with Pro + Phone at $49.99/mo (5,000 a month). It never says a number is in service.

What it does not do

No sending, warmup or inbox placement tests. No published accuracy benchmark against other verifiers. Catch-all domains, Yahoo and AOL cannot be confirmed, and Outlook.com and Hotmail mailboxes are not probed while Microsoft refuses checks from our server's network: all of these come back risky, never valid.

SimpleVerifier facts from our pricing page and product. Last updated October 31, 2026.

What a response tells you

Each call returns a status (valid, risky or invalid), a reason, and flags for disposable, role and catch-all domains. 9,913 disposable domains are recognised. Addresses the mailbox probe cannot confirm are returned as risky, so you can choose whether to accept them rather than having that choice made for you.

Limits

Each API key can make 120 calls a minute, published in the terms alongside the other limits. Included calls reset on the 1st of each month (UTC). Phone format and line-type checks are on the same key.

What the API costs at 10k, 100k and 1M calls a month

At 10,000 calls a month, Pro covers it: $39. At 100,000 calls, Business includes them all: $99. At 1,000,000 calls, the cheapest route is $949 a month on monthly billing (Agency's 300,000 included calls plus $1.00 per 1,000 after). The table below puts every vendor we have priced next to those numbers, including the ones that cost less.

Validation and verification are the same request here: syntax, domain, disposable and live mailbox (SMTP) checks run in one call, so there is no cheaper syntax-only tier and no extra charge for the mailbox check.

Code samples

Create a key in the dashboard and send it as a Bearer token. Full fields, status codes and errors are in the API reference; typed clients are on the SDK page.

curl "https://simpleverifier.com/api/v1/[email protected]" \
  -H "Authorization: Bearer $SIMPLEVERIFIER_KEY"

const res = await fetch(
  "https://simpleverifier.com/api/v1/verify?email=" + encodeURIComponent(email),
  { headers: { Authorization: `Bearer ${process.env.SIMPLEVERIFIER_KEY}` } }
);
const { status, reason, send_advice } = await res.json();
if (status === "invalid") throw new Error(`Please check your email: ${reason}`);

import os, requests

r = requests.get(
    "https://simpleverifier.com/api/v1/verify",
    params={"email": email},
    headers={"Authorization": f"Bearer {os.environ['SIMPLEVERIFIER_KEY']}"},
    timeout=30,
)
result = r.json()  # status: valid | risky | invalid, plus reason and send_advice

{
  "email": "[email protected]",
  "status": "valid",
  "reason": "Mailbox exists",
  "send_advice": "safe",
  "catch_all_confidence": null,
  "mailbox_probed": true
}

When another API is the better pick

• You want to send a whole list in one API request. Ours checks one address per call; lists go through a CSV upload in the dashboard, which does not use API calls.
• You need more than 120 calls a minute on a single key.
• A vendor in the table costs less at your volume. The table is sorted by price and lists those vendors as plainly as the ones that cost more.

Common questions

How much does the email verification API cost?

Pro is $39 a month with 10,000 calls a month included, then $1.50 per 1,000 on monthly billing. Business includes 100,000 calls and Agency 300,000, then $1.00 per 1,000. Starter does not include API access.

Is there a rate limit?

Yes, 120 calls a minute per key, published in the terms alongside the other usage limits.

What does 1,000,000 API calls a month cost?

$949 a month on monthly billing: Agency's 300,000 included calls, then $1.00 per 1,000. 100,000 calls are included on Business at $99.

Is there a free tier for the email validation API?

The first 100 email checks are free after Google sign-in, in the dashboard. API keys come with Pro and up.

Where is the API documentation?

The API reference covers authentication, every response field, status codes and errors, with guides for Node.js, Python, PHP and other stacks.

How long does a real-time check take?

It depends on how quickly the recipient's mail server responds. The integration guides set a timeout and accept the address if it is reached, so a slow server never blocks a real sign-up.