Add 2FA to Your Website

Using SMS, Phone or Email

The easiest way to add two-factor authentication; one simple API call, no complex setup, no monthly fees, and one low rate.

See Code Examples

Why Choose Add2FA?

🚀 Simple Integration

One API endpoint is all you need. Generate and verify 2FA codes with minimal code.

💰 Pay Per Use

Only 1.5¢ per 2FA verification for USA and Canada. No monthly fees, no hidden costs.

📱 SMS & Voice

Support for SMS text messages, voice calls, and/or email for maximum compatibility.

🔒 Secure & Reliable

Customizable code expiration times, and multiple message templates to choose from.

⚡ Fast Response

Instant code generation and delivery. Your users won't be waiting.

🌍 Global Reach

Worldwide service available at additional cost.

Implementation Examples

PHP Implementation

<?php // Generate 2FA code $response = file_get_contents("https://api.add2fa.com/auth?key=YOUR_KEY&type=sms&phonenum=17818640108&expire_minutes=5&message_text=1"); $data = json_decode($response, true); $generated_code = $data['code']; // Store code in session $_SESSION['2fa_code'] = $generated_code; $_SESSION['2fa_expires'] = time() + (5 * 60); // Verify user input if ($_POST['user_code'] == $_SESSION['2fa_code'] && time() < $_SESSION['2fa_expires']) { echo "2FA verified successfully!"; unset($_SESSION['2fa_code'], $_SESSION['2fa_expires']); } else { echo "Invalid or expired code."; } ?>

Python Implementation

import requests import time # Generate 2FA code response = requests.get("https://api.add2fa.com/auth", params={ "key": "YOUR_KEY", "type": "sms", "phonenum": "17818640108", "expire_minutes": 5, "message_text": 1 }) generated_code = response.json()['code'] # Store code and expiration stored_code = generated_code expires_at = time.time() + (5 * 60) # Verify user input user_code = input("Enter 2FA code: ") if user_code == stored_code and time.time() < expires_at: print("2FA verified successfully!") else: print("Invalid or expired code.")

JavaScript (Node.js) Implementation

const axios = require('axios'); // Generate 2FA code const response = await axios.get('https://api.add2fa.com/auth', { params: { key: 'YOUR_KEY', type: 'sms', phonenum: '17818640108', expire_minutes: 5, message_text: 1 } }); const generatedCode = response.data.code; // Store in session/memory req.session.twofa_code = generatedCode; req.session.twofa_expires = Date.now() + (5 * 60 * 1000); // Verify user input if (req.body.user_code === req.session.twofa_code && Date.now() < req.session.twofa_expires) { console.log("2FA verified successfully!"); delete req.session.twofa_code; delete req.session.twofa_expires; } else { console.log("Invalid or expired code."); }

Java Implementation

import java.net.http.*; import java.net.URI; import com.google.gson.Gson; // Generate 2FA code HttpClient client = HttpClient.newHttpClient(); HttpRequest request = HttpRequest.newBuilder() .uri(URI.create("https://api.add2fa.com/auth?key=YOUR_KEY&type=sms&phonenum=17818640108&expire_minutes=5&message_text=1")) .build(); HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString()); Gson gson = new Gson(); Map<String, String> data = gson.fromJson(response.body(), Map.class); String generatedCode = data.get("code"); // Store code and expiration session.setAttribute("2fa_code", generatedCode); session.setAttribute("2fa_expires", System.currentTimeMillis() + (5 * 60 * 1000)); // Verify user input String userCode = request.getParameter("user_code"); if (userCode.equals(session.getAttribute("2fa_code")) && System.currentTimeMillis() < (Long)session.getAttribute("2fa_expires")) { System.out.println("2FA verified successfully!"); }

C# Implementation

using System; using System.Net.Http; using Newtonsoft.Json; // Generate 2FA code using var client = new HttpClient(); var response = await client.GetStringAsync( "https://api.add2fa.com/auth?key=YOUR_KEY&type=sms&phonenum=17818640108&expire_minutes=5&message_text=1" ); dynamic data = JsonConvert.DeserializeObject(response); string generatedCode = data.code; // Store in session Session["2fa_code"] = generatedCode; Session["2fa_expires"] = DateTime.Now.AddMinutes(5); // Verify user input string userCode = Request.Form["user_code"]; if (userCode == Session["2fa_code"].ToString() && DateTime.Now < (DateTime)Session["2fa_expires"]) { Response.Write("2FA verified successfully!"); Session.Remove("2fa_code"); Session.Remove("2fa_expires"); }

cURL Command

# Generate 2FA code curl "https://api.add2fa.com/auth?key=YOUR_KEY&type=sms&phonenum=17818640108&expire_minutes=5&message_text=1" # Response: { "success": true, "code": "123456", "message": "2FA code sent via SMS", "expires_in": 300 } # The returned code should be stored securely and compared # against user input within the expiration time

Simple, Transparent Pricing

No monthly fees. No setup costs. Just pay for what you use.

1.5¢

per 2FA verification

Whether you send 10 codes or 10,000 codes per month, you only pay for successful deliveries. Volume discounts available for high-usage customers.

Get Started Today