One endpoint for every verification type. Real-time SMTP checks, structured JSON responses, and native MCP and Agent Skills integration.
Use a simple API call to verify addresses during signup, enrichment, AI agent workflows, or custom list-processing pipelines.
Every verification type is accessible through the same REST API.
POST /verify — real-time SMTP check with sub-3s response. Returns status, deliverability, quality score, and risk flags in one JSON object.
POST /verify/batch — verify up to 50 addresses per call, synchronously. All results returned in a single response, same schema as single verification.
POST /verify/file — submit CSV or Excel files for background processing. Results delivered via webhook callback when the job completes.
Type-safe client libraries for Python, Node.js, Go, and PHP. Auto-retry on failure, full error handling, and identical response types across all languages.
Every API call runs the same multi-layer check automatically.
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.
Receive results asynchronously and query message history.
Async Delivery
Register HTTP endpoints to receive verification results the moment a job or batch completes. Supports custom payloads, automatic retry on failure, and per-job or global configuration.
Message History
Access the full webhook event log to retrieve past results, debug delivery failures, or replay missed notifications. Events are retained for 30 days.
Connect to every major AI client and SDK without writing verification logic from scratch.
Verify emails in Claude Desktop and Cursor with natural language. Ask "is this address valid?" and get instant results — no API key setup, no code required.
One-click skills for Claude, Manus, and other agent platforms. Email validation runs automatically inside any workflow without manual configuration.
Call the REST API directly from LangChain, CrewAI, any Anthropic or OpenAI SDK, or any HTTP client. Structured JSON parses without transformation — status, score, and flags included.
Every AI-native verification tool in one platform.
Verify emails in Claude Desktop and Cursor with natural language. No code required.
One-click skills for Claude, Manus, and other agent platforms. Automatic email validation in any workflow.
Verify individual addresses with real-time SMTP checks and instant results.
Cached results return in under 200ms. Full SMTP verification completes in 1–3 seconds on average. The API supports up to 6,000 single verification requests per minute and 1,500 batch requests per minute.
The API uses standard REST calls with JSON responses. Official SDKs are available for Python, Node.js, Go, and PHP. Most integrations complete in under 30 minutes. The MCP Server and Agent Skills require no code at all — install once and verification works in any supported AI client.
Pay-as-you-go starts at $0.005 per verification with no monthly fees. Volume pricing goes as low as $0.001 per email for 1M+ credits. A free tier provides 100 verifications daily with no credit card required.
Every response includes the verification status (deliverable, undeliverable, risky, or unknown), a quality score from 0–100, a risk level, and reason codes. Disposable email flag, role account flag, catch-all detection, and typo correction suggestions are also included.
All requests use HTTPS. API key authentication is required on every call, and IP whitelisting is available for additional security. BillionVerify is fully GDPR and CCPA compliant with automatic data deletion after processing.
AI agents connect through the MCP Server (natural language in Claude and Cursor), pre-built Agent Skills (one-click install for Claude and Manus), or direct REST calls from LangChain, CrewAI, or any Anthropic or OpenAI SDK. All methods return the same structured JSON — no response transformation needed.
One endpoint for every verification type. MCP Server and Agent Skills included. 100 free verifications daily, no credit card required.
100 free verifications daily · Native MCP Server integration · No credit card required
