Base generation
Build a country list in minutes: random or operator segment. Hundreds of thousands of rows instead of manual collection. Preview is free — full file after one-time access.
Checkfast.prophone intelligenceBulk phone checksWhatsApp, Telegram, exchanges
Bulk checks for WhatsApp, Telegram, Viber, Binance and 70+ checkers. CSV upload, Reseller API, USDT billing.
64+ checkers · Checkfast.pro · reseller API
Data sources
We aggregate messenger, platform and open-breach signals.
Telegram
Registration, username, activity
Presence and business status
Tags & labels
Directory and tag signals
Social
Facebook, Instagram and more
Breaches
Matches in known leak datasets
Developer API
Bearer tokens and rate limits
Popular checkers
Public landing pages with output format and blog guides.
- WhatsApp Real-time Checker
Service based on fully real-time detection
- Telegram Checker
Basic Telegram number verification
- Binance Checker PRO
Binance account verification
- Carrier Detection
Identify line type (Mobile/Virtual/Landline), carrier, country and region/city. Multiple countries supported.
- Email Validation
Detect whether email addresses are registered on Outlook, Gmail, Yahoo, Mail.ru, or iCloud
- Phone Number Validation
Validate numbering format, line type, and reachability signals before running platform-specific checks
- Number Active Checker
Detect phone number activity level via big-data analytics to improve SMS delivery and reduce costs
- Facebook Checker
Facebook account detection and validation
List tools
Six utilities before checkers: build, tag and clean phones and email. One-time $30 — forever. Checker balance is not charged.
Operator+region+time
Split numbers by carrier, city and timezone. Message in business hours, drop off-target regions before checkers, and cut wasted sends.
RU names + gender
First name and gender for RU numbers: personalize and segment. Real greetings instead of “subscriber” — higher reply rates.
Number cleaner
Drop junk, dupes and broken format, normalize to E.164. Fewer checker charges on WhatsApp/Telegram — pay only for real rows.
Email generator
Email lists from masks and domains: test and production files in seconds. Preview free, full volume with tools access.
Email cleaner
Syntax, dupes and junk domains — before sending and email checks. A clean file, fewer bounces and complaints.
How it works
- 01
Sign up & balance
Create account and top up USDT via NOWPayments or CryptoBot.
- 02
Upload file
TXT/CSV with phones, emails or usernames — min batch per task type.
- 03
CSV & API
Download results or automate with Reseller API.
WhatsApp checker by country
India, Brazil, Indonesia, Mexico, Nigeria, Turkey, Philippines, Vietnam — E.164 format and the right checker.
Checkfast.pro blog
Guides on list hygiene, WhatsApp/Telegram checks and the Reseller API.
AI checker
AI checker for lead scoring and phone antifraud signals
Strengthen AI lead scoring with active_check, high-value flags, and messenger signals from Checkfast.pro — lawfully and with clear rules.
2026-08-13 · 7 min
AI checker
Build an AI checker pipeline with the Checkfast.pro API
Integrate an AI checker via Reseller API: Bearer ck_ keys, bulk tasks, download proxy, and caching for LLM orchestration.
2026-08-13 · 9 min
AI checker
AI checker for WhatsApp & Telegram: validate leads before outreach
Use an AI checker to bulk-verify WhatsApp/Telegram registration, cut CPA, and feed clean signals into your agent stack on Checkfast.pro.
2026-08-13 · 7 min
FAQ
- Is this legal?
- Use the service in compliance with the laws of your jurisdiction. We provide technical checks for uploaded lists.
- How is balance charged?
- Cost = (lines / 10,000) × checker USDT rate. Top-up from $20.
- Do you provide an API?
- Yes. Create a key in the dashboard and call POST /api/v1/check.
Contact us
Message us on Telegram or email — we help with integration and pricing.
Ready to check your list?
Bulk phone intelligence for marketing, antifraud and data enrichment.