usecheck

What it does

Aliases and relays

It detects Firefox Relay, SimpleLogin, DuckDuckGo aliases, and plus-addressing.checked 7 Oct 2026

API endpoints

The API documentation describes endpoints for validating email addresses and domains, and says all endpoints require API key authentication.checked 7 Oct 2026

API response fields

The documented email response includes MX, disposable, public-domain, relay, role-account, alias, spam, domain-age, typo-suggestion, and blocklist fields.checked 7 Oct 2026

Disposable detection

It detects 110K+ throwaway email domains in real time.checked 7 Oct 2026

Integrations

The homepage provides example integration snippets for cURL, Node.js, Python, and Go.checked 7 Oct 2026

Latency

The homepage states an average latency of 45ms.checked 7 Oct 2026

MX verification

It verifies whether an email domain can receive mail.checked 7 Oct 2026

Pricing inclusion

The pricing page says every plan includes all features, including MX verification, disposable detection, typo suggestions, role-account detection, public-domain detection, and relay and alias detection.checked 7 Oct 2026

Product

Usecheck is a real-time email validation API for detecting disposable, temporary, and fake email addresses.checked 7 Oct 2026

Public domains

It identifies Gmail, Yahoo, Outlook, and 500+ free email providers for B2B filtering.checked 7 Oct 2026

Role accounts

It flags shared inboxes such as info@, admin@, and support@.checked 7 Oct 2026

Support

The pricing page lists email support for Starter, priority email for Pro and Business, and dedicated support for Enterprise.checked 7 Oct 2026

Typo suggestions

It catches common misspellings such as gmial.com and yaho.com.checked 7 Oct 2026