API
Documentation

Everything you need to integrate SignupGuard into your application. Protect your platform from fake signups, disposable emails, and fraudulent IP addresses.

What is SignupGuard?

SignupGuard is a fraud prevention API designed to stop fake signups, trial abuse, and low-quality registrations before they reach your database. By analyzing email addresses and IP addresses in real time, SignupGuard helps you identify and block disposable emails, temporary inboxes, VPN users, Tor exit nodes, data center IPs, and other high-risk signals.

The API is built for speed and accuracy. Each request is processed through multiple detection layers — including live DNS resolution, MX record analysis, threat intelligence databases, and geolocation services — to give you a comprehensive risk profile for every signup attempt.

Core Capabilities

Email Verification

Detect disposable, temporary, and throwaway email domains. Cross-reference against a continuously updated database of known disposable email providers and their associated MX records.

IP Intelligence

Analyze IP addresses for threat signals including VPN usage, proxy connections, Tor exit nodes, data center origins, and known abuser networks. Get geolocation and network ownership details.

Threat Database

Access a continuously growing intelligence database of disposable email providers, their domains, MX records, and IP addresses. Updated around the clock to catch new threats.

Base URL

https://signupguard.io

All API requests should be made to this base URL. All endpoints use HTTPS exclusively.

Quick Start

Get up and running in three steps:

1

Create an account

Sign up for a free SignupGuard account to get your API key.

2

Get your API key

Navigate to your dashboard to find your API key. Include it in every request via the X-sg-apikey header.

3

Make your first request

Check an email or IP address using the endpoints below. See the dedicated pages for full details.

Quick Example

Check an email addresscurl
curl -X GET "https://signupguard.io/api/v1/disposable/check/[email protected]" \
  -H "X-sg-apikey: sg-your-api-key-here"

Explore the Docs

Email Verification

Detect disposable and temporary email addresses in real time.

IP Intelligence

Identify VPNs, proxies, Tor nodes, and high-risk IP addresses.

Authentication

Learn how to authenticate your API requests with API keys.

Rate Limits

Understand request limits and how to handle rate limiting.

Error Handling

Handle API errors gracefully with standard error codes.