How to bulk-check WhatsApp numbers — ws on Cheker.pro

Bulk-check ws shows who to reach on messenger vs SMS.

WhatsApp Real-time Checker (ws) is Cheker.pro bulk WhatsApp verification. This guide covers mass phone checks, ws API, phone intelligence, list hygiene before SMS/messengers, and CSV export for CRM.

Who it is for

WhatsApp Real-time Checker is used by SMS hubs, performance marketing, crypto compliance, call centers and SaaS with Reseller API. If your pipeline segments «has WhatsApp / not» — this task type covers bulk at scale.

What WhatsApp Real-time Checker does

Service based on fully real-time detection. Each input line becomes one CSV row with result fields.

Task type: ws. Family: WhatsApp. Input type: phone.

Pricing and output on WhatsApp Real-time Checker landing. Run tasks in dashboard.

Input file format

Upload TXT or CSV: phone numbers in international format (E.164 recommended, e.g. +14155552671). One file = one country only (country code in every line: Brazil 55, US 1, Russia 7).

• Minimum: 500 lines per task
• Maximum: 10,000,000 lines (large files auto-split)
• E.164 recommended: +country code, no spaces or brackets
• See format preview in the upload form at WhatsApp Real-time Checker

Do not mix phone, email and username in one file. From Excel export a single column to CSV — avoid formulas and scientific notation.

Output fields

• Number
• whatsapp: yes/no

Interpret Number · whatsapp: yes/no with a clear rule: «yes» → WhatsApp channel candidate; «no» → SMS/email fallback or exclude from campaign.

Use cases

• Call center moves payment reminders to WA after ws-check.
• Call center moves payment reminders to WA after ws-check.
• Call center moves payment reminders to WA after ws-check.

How to run a check

1. Sign up at Cheker.pro and top up USDT
2. Open WhatsApp Real-time Checker — TXT/CSV upload form
3. Wait for completion in «Мои задачи»
4. Download CSV into CRM / SMS hub / BI
5. Automation: Reseller API — ws

Common mistakes

• Local format without country code → false «no» results.
• Mixed countries in one file → API rejection or wrong output.
• Confusing WhatsApp registration with «number is reachable» — different signals.
• Treating «no» as permanent block without re-check after 7–14 days.
• Bulk-check without legal basis (GDPR / local telecom rules) — validation does not replace consent.

Reading yes/no

"No" on WhatsApp may mean no account, privacy settings, or upstream lag. Do not auto-block on one field alone.

Related WhatsApp checkers

• WhatsApp Days Checker (ws_active) — Detect WhatsApp account activity duration, whether it is a business account, and signature information
• WhatsApp Age & Gender Checker (ws_avatar) — Comprehensive WhatsApp data analysis

FAQ

How is WhatsApp Real-time Checker different from other WhatsApp checkers?

Task type ws: Service based on fully real-time detection. Output: Number · whatsapp: yes/no. Compare family variants in the checker catalog and ws landing.

Minimum batch size and file format for ws?

Minimum 500 lines. phone numbers in international format (E.164 recommended, e.g. +14155552671). One country per file. Format hints on the upload page.

How much does WhatsApp Real-time Checker cost?

Pay-as-you-go USDT: per-line billing at checker rate. Current price per 10k lines on the ws card and dashboard after top-up.

API for WhatsApp Real-time Checker?

Yes. Reseller API: POST /api/v1/check with task type ws. Keys: API keys, docs: /docs.

Is bulk checking legal?

Use only lists with opt-in or other lawful basis (GDPR, local rules). Cheker.pro acts as processor on your instructions; you define retention and consent policy.

Summary: WhatsApp Real-time Checker is the bulk layer for WhatsApp. Catalog: ws · run → · Cheker.pro blog