Real-Time Email Validator

Email Verification API

Integrate a real-time email verification API that validates any address the moment it enters your system. EmailVerify.io's email validation API runs syntax, MX, blacklist, and SMTP mailbox checks in a single request, returning a clean JSON status and sub_status so your app can act instantly. Built for developers who need an accurate, scalable email validator API with up to 99% accuracy.

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100 free credits · no credit card required · replenishes monthly

verify-email.js

How It Works

How the Email Validation API Verifies an Address

Every request to the verify email API runs through a multi-layer check pipeline before returning a result — no email is ever sent to the recipient.

Syntax Check

Validates the address against industry-standard regex patterns to catch typos and malformed input before any network call.

DNS / MX Lookup

Confirms the domain has valid Mail Exchange records and is configured to receive email, then screens it against known blacklists.

SMTP Mailbox Check

Performs a live SMTP handshake with the receiving server to confirm the mailbox exists — without delivering a message.

Risk & Catch-All Filter

Flags disposable, role-based, spam-trap, and catch-all domains, returning an honest sub_status so you avoid false positives.

Capabilities

Why Developers Choose Our Email Verification API

Everything you need from a production email checker API — accurate signals, structured responses, and the edge-case handling real systems depend on.

Real-Time Verification

Sub-second responses make it safe to validate inline at signup or checkout without slowing the user experience.

Disposable & Temporary Detection

A continuously updated index flags throwaway inboxes so you can block fake signups and fraud at the source.

Catch-All Domain Identification

Domains that accept everything are reported transparently instead of being marked falsely valid.

SMTP-Level Mailbox Check

A live handshake with the receiving server confirms the mailbox is real and able to accept mail.

Syntax & MX Validation

Regex and Mail Exchange checks catch typos and dead domains before they ever reach your database.

Spam-Trap & Role-Based Flags

Identify spam traps and role addresses like info@ or admin@ so you protect sender reputation and deliverability.

SDKs & Code

Integrate the Email Verification API in Minutes

Call the /validate endpoint directly or use an official SDK for Python, Node.js, PHP, Ruby, Golang, .NET / C#.

import requests
url = "https://app.emailverify.io/api/v1/validate"
params = {"key": "YOUR_API_KEY", "email": "[email protected]"}
resp = requests.get(url, params=params)
data = resp.json()
print(data["status"])  # "valid"

const https = require('https');
const url = `https://app.emailverify.io/api/v1/[email protected]`;
https.get(url, (res) => {
  let data = '';
  res.on('data', chunk => data += chunk);
  res.on('end', () => console.log(JSON.parse(data).status));
});

<?php
$url = 'https://app.emailverify.io/api/v1/[email protected]';
$data = json_decode(file_get_contents($url), true);
echo $data['status']; // "valid"

require 'net/http'
uri = URI("https://app.emailverify.io/api/v1/[email protected]")
data = JSON.parse(Net::HTTP.get(uri))
puts data["status"]  # "valid"

package main
import ("encoding/json"; "fmt"; "io"; "net/http")
func main() {
  resp, _ := http.Get("https://app.emailverify.io/api/v1/[email protected]")
  defer resp.Body.Close()
  body, _ := io.ReadAll(resp.Body)
  var result map[string]interface{}
  json.Unmarshal(body, &result)
  fmt.Println(result["status"])
}

using System.Net.Http;
using System.Text.Json;
var client = new HttpClient();
var url = "https://app.emailverify.io/api/v1/[email protected]";
var json = await client.GetStringAsync(url);
var doc = JsonDocument.Parse(json);
Console.WriteLine(doc.RootElement.GetProperty("status").GetString());

Use Cases

Where Teams Use the Email Verification API

SaaS Signups & Forms

Validate addresses inline during registration to block bots, typos, and disposable inboxes before they pollute your user base.

CRM & Database Hygiene

Verify records as they enter your CRM so sales and marketing work from clean, deliverable contact data.

Marketing Campaign Prep

Screen addresses ahead of a send to cut hard bounces, protect sender reputation, and lift inbox placement.

Transactional Email Systems

Confirm a mailbox exists before triggering password resets, receipts, or notifications that must reach the inbox.

Free Forever Tier

A Free Email Verification API for Developers

Looking for a free email verification API? Generate an API key and get 100 free verification credits plus 10 email finder queries the moment you sign up — no credit card required, and your credits replenish every month. It's a genuine free email validation API tier built for testing real integrations, not a time-limited trial.

Get Free API Key Read the Docs

Price Comparison

EmailVerify.io vs NeverBounce vs ZeroBounce

Start strong: $20/month for 30,000 verifications — up to 10× more emails than others per dollar.

Verifications / month	EmailVerify.io	NeverBounce	ZeroBounce
30,000 credits	$20	$150	$210
60,000 credits	$40	$300	$420
120,000 credits	$80	$480	$468
180,000 credits	$115	$720	$702

See full pricing & plans →

Quick Start

Get Started in 3 Steps

Start verifying emails in minutes with 100 free credits, no credit card required.

Create Free Account

Get Your API Key

Access your unique API key from your dashboard and start making requests immediately.

Make Your First Request

Call the API endpoint with your key and start verifying emails using your 100 free credits.

Ready to get started?

Get 100 free verification credits and 10 email finder queries when you sign up today. All credits replenish monthly.

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FAQs

Frequently Asked Questions

What is an email verification API?

An email verification API lets you programmatically check whether an email address is valid, deliverable, and safe to send. EmailVerify.io's email verification API runs syntax, MX, MX blacklist, and SMTP mailbox checks, then returns a structured JSON response with a status and sub_status so your application can decide in real time during signups, form submissions, or CRM imports.

How does the email verification API work?

Send a GET request to https://app.emailverify.io/api/v1/validate with your API key and the email address. The email validator API checks the syntax, confirms MX records, screens the domain against blacklists, and performs a real-time SMTP handshake. It returns a JSON object such as {"email":"[email protected]","status":"valid","sub_status":"permitted"}.

Is there a free email verification API?

Yes. You can generate a free API key with no credit card and receive 100 free verification credits plus 10 email finder queries that replenish every month. This free email verification API tier lets you test real validations and your integration before upgrading.

How accurate is the email verification API?

EmailVerify.io delivers up to 99% accuracy by combining syntax validation, DNS and MX lookups, MX blacklist screening, and SMTP-level mailbox testing. Catch-all and uncertain mailboxes are reported honestly so you avoid false positives.

What is the difference between email verification and email validation?

Email validation typically checks format and domain (syntax and MX). Email verification goes further and confirms the mailbox exists by talking to the receiving SMTP server. EmailVerify.io's API does both in a single real-time request, which is why it works as an email validation API and an email verifier API.

Can I test the email verification API for free?

Yes. Create a free account, generate an API key, and call the endpoint immediately using your 100 free monthly credits. No credit card is required, and a Postman collection is available to help you test the email verification API quickly.