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.

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

Microsoft Number Checker API. Find numbers attached to a Microsoft account. Bulk, over REST, with Python, Node.js and cURL examples.

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

email checker bot with proxy captcha bypass

Facebook Email Checker API. Check which email addresses are registered with Facebook. Bulk, over REST, with Python, Node.js and cURL examples.

Telegram Number Checker API. Detect which numbers have a Telegram account and can be reached in the app. Bulk, over REST, with Python, Node.js and cURL examples.

Viber Number Checker API. Find the numbers that use Viber, for campaigns on the platform. Bulk, over REST, with Python, Node.js and cURL examples.

iMessage Number Checker API. See which numbers are on iMessage, so you know who is on an iPhone and reachable there. Bulk, over REST, with Python, Node.js and cURL examples.

Apple ID Number Checker API. Find numbers linked to an Apple ID, a strong signal of an iPhone user. Bulk, over REST, with Python, Node.js and cURL examples.

TalismanLeads REST API: bulk phone, email and carrier checks. OpenAPI 3.1 file and complete Python, Node.js and cURL examples.

📫 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.

Telegram Activity Checker API. Beyond registration: see how recently each Telegram account was active. Bulk, over REST, with Python, Node.js and cURL examples.

Apple ID Email Checker API. Check which email addresses are tied to an Apple ID. Bulk, over REST, with Python, Node.js and cURL examples.

Facebook Number Checker API. Find which phone numbers have a Facebook account attached, before you run ads or outreach. Bulk, over REST, with Python, Node.js and cURL examples.

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.

Viber Activity Checker API. See when each Viber account was last seen online, to focus on active users. Bulk, over REST, with Python, Node.js and cURL examples.

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.

Amazon Email Checker API. Check which email addresses are registered with Amazon. Bulk, over REST, with Python, Node.js and cURL examples.