lead-validation

Limitguard MCP server: lead validation for AI agents. Checks the company behind a lead in the Dutch (KVK) and Belgian (KBO) registers, EU VAT (VIES) and sanctions lists. Pay per call with x402 or an API key.

Documentation for the Limitguard API: lead validation and company checks against the KVK and KBO registers, EU VAT (VIES) and sanctions lists. API key, x402 pay-per-call or MCP.

WhatsApp number validation guides — check if a number has WhatsApp, clean marketing lists, phone number formats, signup validation, Google Sheets checker.

A free review-first validation checklist for real estate lead intake workflows in n8n. Synthetic data only; no credentials or email gate.

email checker bot with proxy captcha bypass

WhatsApp Number Checker API — check if a phone number has WhatsApp in real time. OpenAPI spec and examples in Python, Node.js, PHP, Go, Java, C# and cURL.

📫 Asynchronous email deliverability verifier that performs MX lookups, SMTP RCPT probes, and catch-all detection with retries, resume support, and CSV/JSON reporting.

Bulk WhatsApp Checker API — verify up to 100 phone numbers per request and clean WhatsApp marketing lists. Examples in 7 languages plus a CSV list cleaner.

Email Verifier API — independent third-party profile of a public API surface, by API Evangelist. Email Verifier API is a real-time email verification service offering a 16-point engine that validates deliverability through syntax checking, DNS / MX lookups, real-time SMTP handshakes, mailbox existence probing, catch-all and greylisting detection, d