MAX Checker: bulk MAX verification, API & CSV output guide

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

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

Badge HOT in catalog.

Who it is for

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

What MAX Checker does

MAX account activation detection by phone number. Each input line becomes one CSV row with result fields.

Task type: max. Family: MAX. Input type: phone.

Pricing and output on MAX 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 MAX 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
• max: yes/no

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

Use cases

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

How to run a check

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

Common mistakes

• Local format without country code → false «no» results.
• Mixed countries in one file → API rejection or wrong output.
• Confusing MAX 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 MAX may mean no account, privacy settings, or upstream lag. Do not auto-block on one field alone.

Related MAX checkers

• MAX Full Info Checker (max_full) — MAX account full profile: gender, age, last seen, avatar

FAQ

How is MAX Checker different from other MAX checkers?

Task type max: MAX account activation detection by phone number. Output: Number · max: yes/no. Compare family variants in the checker catalog and max landing.

Minimum batch size and file format for max?

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 MAX Checker cost?

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

API for MAX Checker?

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