Viber Days Checker: bulk Viber verification, API & CSV output guide

Viber Days Checker answers whether a contact is registered on Viber. Bulk signal for CRM and marketing ops.

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

Who it is for

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

What Viber Days Checker does

Detect Viber account activity days and last online time. Each input line becomes one CSV row with result fields.

Task type: viber_active. Family: Viber. Input type: phone.

Pricing and output on Viber 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 Viber 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
• last online

Interpret activated · activedays · last online with a clear rule: «yes» → Viber channel candidate; «no» → SMS/email fallback or exclude from campaign.

Use cases

• Marketing runs a separate sequence for "Viber: yes".
• CRM enrichment before look-alike campaigns.
• Marketing runs a separate sequence for "Viber: yes".

How to run a check

1. Sign up at Cheker.pro and top up USDT
2. Open Viber 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 — viber_active

Common mistakes

• Local format without country code → false «no» results.
• Mixed countries in one file → API rejection or wrong output.
• Confusing Viber 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 Viber. For re-engagement, drop accounts with activedays > 90; for antifraud, recent activity may be a positive signal.

Related Viber checkers

• Viber Checker (viber) — Viber account verification
• Viber Avatar, Age, Gender & Others (viber_senior) — Detect Viber account age, gender and profile information

FAQ

How is Viber Days Checker different from other Viber checkers?

Task type viber_active: Detect Viber account activity days and last online time. Output: activated · activedays · last online. Compare family variants in the checker catalog and viber_active landing.

Minimum batch size and file format for viber_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 Viber Days Checker cost?

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

API for Viber Days Checker?

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