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

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

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

Who it is for

WhatsApp Days 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 Days Checker does

Detect WhatsApp account activity duration, whether it is a business account, and signature information. Each input line becomes one CSV row with result fields.

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

Pricing and output on WhatsApp Days 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: 1,000 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 Days 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

• activated
• activedays
• business
• signature

Interpret activated · activedays · business · signature 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.
• Retail keeps only whatsapp: yes rows for WA blasts — higher OR than SMS.
• 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 Days 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_active

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.

How to read activity

activedays and last online show last activity on WhatsApp. For re-engagement, drop accounts with activedays > 90; for antifraud, recent activity may be a positive signal.

Related WhatsApp checkers

• WhatsApp Real-time Checker (ws) — Service based on fully real-time detection
• WhatsApp Age & Gender Checker (ws_avatar) — Comprehensive WhatsApp data analysis

FAQ

How is WhatsApp Days Checker different from other WhatsApp checkers?

Task type ws_active: Detect WhatsApp account activity duration, whether it is a business account, and signature information. Output: activated · activedays · business · signature. Compare family variants in the checker catalog and ws_active landing.

Minimum batch size and file format for ws_active?

Minimum 1,000 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 Days Checker cost?

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

API for WhatsApp Days Checker?

Yes. Reseller API: POST /api/v1/check with task type ws_active. 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 Days Checker is the bulk layer for WhatsApp. Catalog: ws_active · run → · Cheker.pro blog