📊 2026 Email Verification Market Report — 20 providers benchmarked.Read Report
Real-time response, single endpoint design, structured JSON that AI agents parse without transformation. The verification API built for autonomous systems. Free tier included.
Four ways AI agents consume our API
Natural language verification in Claude and Cursor. No code needed.
Add verification as a tool in agent chains. Structured output for downstream processing.
Research Agent extracts emails. Verification gate filters. Outreach Agent sends to valid only.
Single endpoint, one JSON response, stateless. Integrate in under 15 minutes.
Designed for autonomous consumption
No route confusion for agents — one URL for all verification types
Parseable without transformation — status, score, reason, and flags in every response
Fast enough for real-time agent decision loops and signup validation
No session management for autonomous workflows — every request is independent
AI agents can't enter a credit card. Our free tier lets them start verifying on the first API call.
Real-time for agent decision loops
Verify up to 50 emails per pipeline step
Async results for long-running workflows
Automatic retry — agents don't need error handling
Same email twice? Zero extra cost.
Simple key-based auth — no OAuth dance
POST https://api.billionverify.com/v1/verify/single
Content-Type: application/json
BV-API-KEY: YOUR_API_KEY
{
"email": "user@example.com",
"check_smtp": true
}{
"email": "user@example.com",
"status": "valid",
"reason": "accepted",
"score": 98,
"disposable": false,
"role": false,
"free": false,
"smtp_check": true,
"mx_records": true,
"suggestion": null
}Call the API directly with JSON
Type-safe libraries for major languages
One-click setup, no coding needed
/v1/verify/singleSingle email verification
/v1/verify/bulkBatch verification (sync, max 50)
/v1/verify/fileFile upload verification (async)
/v1/creditsCheck remaining credits
statusstringVerification status
reasonstringValidation reason details
scoreintegerEmail quality score 0-100
disposablebooleanDisposable email detected
suggestionstringTypo correction suggestion
Block fake emails at registration in real time
POST /v1/verify/singleVerify on submit before saving to your database
POST /v1/verify/singleKeep contact databases clean automatically
POST /v1/verify/bulkVerify extracted emails in AI agent workflows
POST /v1/verify/fileDiscover all our verification tools
Cached results return in under 200ms. Full SMTP verification averages 1-3 seconds. It supports up to 6,000 single verification requests per minute and 1,500 batch requests per minute for high-volume use cases.
The API uses simple REST calls with JSON responses. Official SDKs are available for Python, Node.js, Go, PHP, and Ruby. Most developers complete the integration in under 30 minutes. A free tier lets you test with real data before going live.
Pricing starts at $0.005 per verification with pay-as-you-go billing and no monthly fees. Volume discounts go up to 97.2% for high-volume usage. A free tier includes 100 verifications daily, and enterprise plans offer custom pricing.
Each response includes the verification status (deliverable, undeliverable, risky, or unknown), a quality score from 0-100, a risk level, and detailed reason codes. It also flags disposable emails, role accounts, and suggests typo corrections when applicable.
All requests use HTTPS encryption. API key authentication is required for every call, and IP whitelisting is available for additional security. We are fully GDPR and CCPA compliant with automatic data deletion after processing.
The API allows 6,000 single verification requests per minute, 1,500 batch requests per minute, and 300 file upload requests per minute. Rate limits apply per API key. Enterprise plans offer higher limits with dedicated infrastructure.
Yes. The free tier provides 100 verifications daily with no credit card required. It includes all features — syntax check, domain verification, SMTP validation, and disposable detection. Upgrade to pay-as-you-go when you need higher volume.
AI agents connect through our MCP Server (for Claude and Cursor), as a LangChain tool, as a CrewAI verification gate, or via direct REST calls. The API returns structured JSON with status, score, and reason fields that agents parse without transformation.
The MCP Server lets AI assistants like Claude and Cursor verify emails using natural language. Ask 'verify user@example.com' in your AI session and get instant results. No API key setup, no code — it connects through the Model Context Protocol standard.
Free tier included. No credit card. No human intervention needed. AI agents can start verifying on the first call.