Tempo Checker

Tempo Checker is an API service that detects disposable and temporary email addresses before they can create accounts on your platform. It solves a problem that every SaaS company with a free tier or trial eventually runs into. Users create accounts with throwaway inboxes to circumvent usage limits, reset free trials, or farm referral bonuses. These aren't real users in any meaningful sense. They're noise in your database, and they skew your metrics, waste server resources, inflate your user counts with phantom accounts, and abuse whatever you're offering for free. Tempo Checker catches them at the point of signup by validating email domains in real time and flagging the ones that resolve to known temp mail services before the account ever gets created.

The detection system uses a three layer approach that goes beyond simple blocklists. The first layer checks the email domain against a database of over 40 million known disposable mail providers. This covers the obvious services like Guerrilla Mail, 10 Minute Mail, and Mailinator, but also thousands of smaller and more obscure temp mail providers that most static blocklists miss entirely. The database isn't just big. It's actively maintained and expanded every week. The second layer runs DNS and MX record validation to confirm the domain actually exists and is configured to receive mail. This catches typos, completely fabricated domains, and domains that were valid once but have since been abandoned or misconfigured.

The third layer is where the system differentiates itself from simpler solutions. An AI scraper agent continuously monitors the web for newly created temp mail services, adding roughly 1,200 new disposable domains to the blocklist every week. New burner email providers launch constantly, and static blocklists become stale within days of publication. The scraper addresses that by treating blocklist maintenance as an ongoing process rather than a one time effort. This means the database stays current even as the disposable email landscape keeps evolving.

Response times are under 50 milliseconds, which is fast enough to run inline during a signup flow without users noticing any delay. When you call the API with an email address, it returns a verdict along with confidence scoring and details about why the address was flagged or passed. You get enough information to decide how to handle edge cases on your own terms. Some teams reject flagged addresses outright and show an error message asking for a different email. Others route flagged signups to a secondary verification step like SMS confirmation or manual review. The granularity lets you tune the response based on how much friction you're willing to add and how aggressive you want to be about blocking.

For testing before you integrate, there's a manual tool on the site where you can paste in an email address and get an instant result. It's useful for spot checking specific domains, investigating why a particular address got flagged, or demonstrating the service to stakeholders who want to see it work before approving the integration. For production use, the REST API accepts single email lookups and returns structured JSON responses. Integration is straightforward if you're comfortable with API calls from your backend. The documentation covers the request format and response schema, though you'll need to register for an account to access the full API reference and get your API keys.

Accuracy sits at 99.7% according to the service, which reflects both the breadth of the blocklist and the layered verification approach. False positives are always a concern with email validation services, and the three layer system helps minimize them by requiring multiple signals before flagging a domain. An address won't get blocked just because the domain is new or unfamiliar to the system. It has to match known temp mail patterns, fail DNS checks, or show up in the AI scraper's regular sweeps of disposable mail directories. That multi signal requirement keeps the false positive rate low while still catching the vast majority of throwaway addresses.

The free tier includes 500 checks per month with no credit card required. That's enough to test the integration thoroughly and run it on a low traffic project indefinitely. For higher volumes, paid tiers are available, though the specific pricing structure isn't detailed on the landing page. You would need to contact the team for volume pricing. This is common for API services that scale with usage, since the cost depends heavily on how many checks you're running and what kind of support level you need.

Tempo Checker fits SaaS companies, freemium products, lead generation forms, newsletter signups, and any platform where fake accounts cost you money or distort your data. If you've ever looked at your user analytics and noticed a cluster of addresses from guerrillamail.com or temp-mail.org, this is the filter that catches them at the door. It won't replace a full email verification suite that checks deliverability, catches typos, and validates inbox existence. But for the narrow problem of blocking burner inboxes before they ever become rows in your database, the speed and accuracy make it a focused solution worth evaluating.