# WAChecker

> Free bulk WhatsApp number checker. Verify whether phone numbers are registered on WhatsApp — no signup, no credit card, no limits.

## Product

BulkNumberChecker (https://www.bulknumberchecker.com) is a free web tool that validates phone numbers against WhatsApp in real-time. Upload a CSV or paste numbers, receive results, and export a clean CSV. Up to 1,000 numbers per batch with no daily cap on web use.

## Public API (v1)

A free, no-auth REST API for developers and AI agents to validate WhatsApp numbers programmatically.

- OpenAPI 3.1 specification: https://www.bulknumberchecker.com/openapi.json
- Human docs and code examples: https://www.bulknumberchecker.com/developers
- ChatGPT plugin manifest: https://www.bulknumberchecker.com/.well-known/ai-plugin.json

Free tier limits: 10 numbers per request, 5 requests per IP per day (UTC reset). Poll endpoints (GET) are unmetered.

## Key Pages

- Home: https://www.bulknumberchecker.com/
- Check numbers: https://www.bulknumberchecker.com/check
- Developer docs: https://www.bulknumberchecker.com/developers
- Bulk validation guide: https://www.bulknumberchecker.com/bulk-validation-guide
- How to check a WhatsApp number: https://www.bulknumberchecker.com/how-to-check-whatsapp-number
- FAQ: https://www.bulknumberchecker.com/faq
- Compare vs competitors: https://www.bulknumberchecker.com/vs-competitors
- Blog: https://www.bulknumberchecker.com/blog

## Contact

- Email: tbsidevs@gmail.com
- Site: https://www.bulknumberchecker.com/about