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Most integrations end up using the same API key for two different things.
The first is inline - a signup form, a checkout step, a lead form. One email in, one JSON response back, status field included, without adding a noticeable delay. That's the real-time endpoint: synchronous, no polling.
The second is quieter - a scheduled job re-checking an existing list before a campaign, or a CRM sync. Same credentials, different endpoint, no separate integration to maintain.
Where it gets more interesting is platforms verifying emails on behalf of their users - a CRM, an enrichment tool, a data pipeline where verification is one step among several. That traffic is spikier and less predictable than a marketer running a monthly cleanup, so we'd rather you test against your own pattern than take a number off this page. The docs have working examples either way.
Credits don't expire, so pricing stays simple even as usage patterns shift. Code examples in Python, PHP, JavaScript, and cURL are in the API docs.
An email verification API is a programmatic interface that lets you validate email addresses in real time, batch, or large through simple REST calls. Proofy's email verifier API checks each address against syntax rules, DNS and MX records, and a live SMTP handshake - returning a structured JSON verdict in under one second. Each address is classified as valid, invalid, risky, disposable, catch-all, or role-based, with full documentation and code examples for Python, PHP, JavaScript, and cURL available at docs.proofy.io.
An email verification API integrates directly into applications, enabling real-time or batch validation of email addresses. It checks syntax, domains, and mailboxes, ensuring accurate categorization as valid, invalid, risky, or unknown for cleaner, up-to-date email lists.
Proofy does not offer free credits to prevent abuse. New users can purchase a trial package to test the API across all three modes before committing to a larger plan. Full API documentation is publicly available at docs.proofy.io without registration.
An email verification API offers bulk validation of up to
1 million addresses per file with high accuracy and speed. It validates MX records, assesses domain quality, detects disposable emails, and processes data in real-time, all without requiring software installation.
Any business, startup, or organization that handles email lists can benefit from an email validation API. It’s ideal for companies looking to integrate seamless email verification into their systems, ensuring clean and accurate databases for marketing, communication, or user engagement.
Real-time verification validates a single address per call and returns a result immediately, typically used on signup or checkout forms. Batch and large file modes accept multiple addresses in one request or as a file and process them asynchronously, making them suitable for cleaning existing lists or running scheduled database hygiene jobs.
