API, MCP Server, bulk verification, and AI agents — one platform.
Validate one email before it enters a lead list, signup flow, or outbound workflow. The result shows status, SMTP verification, MX records, and reputation details in one product surface.
Turn large lists into clear validity distribution, status counts, and export-ready segments so sales and marketing teams can remove bad addresses before campaigns launch.
Submit email files, estimate processing time, and watch live progress by status while BillionVerify handles the batch verification job in the background.
Use a simple API call to verify addresses during signup, enrichment, AI agent workflows, or custom list-processing pipelines.
Purpose-built filters that run on every verification to protect your sender reputation.
Check individual emails for validity, deliverability, and reputation. No account required.
Identify and block temporary email services before they pollute your list.
Detect emails likely to bounce before sending, protecting your sender reputation.
Purpose-built for AI agents and autonomous workflows
Call the REST API directly from any AI agent or automation pipeline. Structured JSON, sub-second responses, SDKs for Python, Node.js, and Go.
Verify emails in Claude and Cursor with natural language. Works with any MCP client — no coding required.
One-click skills for Claude, Manus, and other agent platforms. Automatic email validation in any workflow.
Async verification for long-running workflows. Results delivered automatically — no polling, no waiting.
Built for speed, accuracy, and reliability
99.9%
Accuracy
SMTP-level verification
99.99%
Uptime
Enterprise-grade reliability
50K/hr
Throughput
Bulk processing speed
<200ms
API Response
Cached result latency
Native MCP Server for Claude and Cursor. Plus 25+ marketing platform connectors.
Every verification runs through syntax validation, DNS and MX record lookup, SMTP mailbox confirmation (a real connection to the mail server), disposable email detection, role account identification (info@, admin@, support@), catch-all domain detection, and spam trap screening. These checks run automatically on every request — bulk or API — so you get a complete picture without configuring anything.
BillionVerify achieves 99.9% accuracy. The key is SMTP verification: we open a real connection to the receiving mail server and confirm the specific mailbox exists — not just whether the domain looks valid. This catches invalid addresses that format checks and DNS-only tools miss.
Cached results return in under 200ms. Full SMTP verification completes in 1–3 seconds on average — fast enough for sign-up form validation. For bulk lists, you can process up to 50,000 emails per hour by uploading a CSV file.
You can connect via the REST API with official SDKs for Python, Node.js, Go, and PHP. There are also 25+ native connectors for platforms like Mailchimp, SendGrid, HubSpot, Klaviyo, Salesforce, Zapier, and Make. For AI workflows, the MCP Server works directly in Claude and Cursor, and pre-built Agent Skills install with one click in Claude and Manus.
All data is encrypted with 256-bit SSL in transit and at rest. We are fully GDPR and CCPA compliant. Email addresses are automatically deleted after processing — we never store or share your data with third parties.
Create a free account — no credit card required. You get 100 verifications per day on the free tier immediately. The MCP Server and Agent Skills are free to install and work right away. To try bulk verification, upload a CSV and results arrive within minutes. API keys are available under Settings as soon as you sign up.
MCP Server, AI Agent Skills, and a free tier for autonomous workflows. 99.9% SMTP-level accuracy.
Native MCP Server integration · 99.9% SMTP-level accuracy · Free tier, no credit card
