Zalo checker zalo_active: use cases, compliance & integration

Zalo checker on Cheker.pro: file upload → CSV, no manual number probing.

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

Who it is for

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

What Zalo Days Checker does

Zalo account activity days detection. Each input line becomes one CSV row with result fields.

Task type: zalo_active. Family: Zalo. Input type: phone.

Pricing and output on Zalo 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: 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 Zalo 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

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

Use cases

• CRM enrichment before look-alike campaigns.
• CRM enrichment before look-alike campaigns.
• CRM enrichment before look-alike campaigns.

How to run a check

1. Sign up at Cheker.pro and top up USDT
2. Open Zalo 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 — zalo_active

Common mistakes

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

Related Zalo checkers

• Zalo Checker (zalo) — Zalo account verification
• Zalo Age & Gender Checker (zalo_gender) — Detect Zalo account age, gender and profile information

FAQ

How is Zalo Days Checker different from other Zalo checkers?

Task type zalo_active: Zalo account activity days detection. Output: activated · activedays. Compare family variants in the checker catalog and zalo_active landing.

Minimum batch size and file format for zalo_active?

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 Zalo Days Checker cost?

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

API for Zalo Days Checker?

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