Email verification for sign-up forms, CRMs and outbound lists.
BillionVerify checks whether an email address can receive mail before you send to it, so bounces and fake sign-ups stay out of your lists.
- Real-time verification for a single address, built into sign-up and checkout forms. Learn more
- Bulk verification and list cleaning for CSV files and existing lists. Learn more
- Risk signals beyond valid / invalid: catch-all domains, disposable addresses and role accounts.
- Free email tools for SPF, DKIM, DMARC, MX and blacklist checks. Browse the tools
Create an API key in the BillionVerify dashboard, then verify an address:
curl -X POST https://api.billionverify.com/v1/verify/single \
-H "BV-API-KEY: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"email": "test@example.com"}'Base URL https://api.billionverify.com/v1. The full contract is in the API reference and the OpenAPI spec.
| Project | What it is |
|---|---|
| billionverify-node | Node.js SDK |
| billionverify-python | Python SDK |
| billionverify-go | Go SDK |
| billionverify-java | Java SDK |
| billionverify-php | PHP SDK |
| billionverify-cli | Command-line tool |
| billionverify-mcp | MCP server for AI assistants |
| billionverify-skill | Agent skill for AI coding agents |
| wordpress | WordPress plugin |
| n8n-nodes-billionverify | n8n community node |
| disposable | Open-source disposable email detection |
SDK docs: billionverify.github.io
- Forms and CMS: WordPress, Google Forms, Typeform
- E-commerce: Shopify, WooCommerce
- CRM and email marketing: HubSpot, Mailchimp
- Automation: Zapier
- AI agents: MCP server, agent skills
- Email: support@billionverify.com
- Documentation: billionverify.com/docs
- Guides: Email Marketing Bible and the blog
