NumberChecker API - Phone Number Verification Service

Welcome to NumberChecker API — a phone number verification and validation service for developers and businesses worldwide.

API Introduction

NumberChecker provides advanced phone number verification APIs that help you validate and verify phone numbers across 20+ platforms in bulk. Whether you need to verify WhatsApp registrations, detect social media accounts, check cryptocurrency exchange users, or query phone carrier information, NumberChecker has you covered.

Typical use cases:

• Marketing list cleaning — remove inactive numbers before sending campaigns
• Fraud prevention — verify user-provided phone numbers on registration
• CRM enrichment — identify which platforms your contacts use
• Crypto exchange KYC — cross-check user phone numbers against exchange registrations

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Quick Start

1. Get your API Key

Sign up at numberchecker.ai and retrieve your API key from the dashboard.

2. Submit a batch task

Upload a .txt or .csv file with one phone number per line (E.164 format, e.g. +8613800138000):

curl --location 'https://api.numberchecker.ai/v1/tasks' \
--header 'X-API-Key: YOUR_API_KEY' \
--form 'file=@"./numbers.txt"' \
--form 'task_type="ws"'

3. Poll for results

curl --location 'https://api.numberchecker.ai/v1/gettasks' \
--header 'X-API-Key: YOUR_API_KEY' \
--form 'task_id="TASK_ID_FROM_STEP_2"'

When status becomes exported, download the result file from result_url.

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API Overview

Item	Details
Base URL	https://api.numberchecker.ai
Authentication	X-API-Key header
Submit task	POST /v1/tasks (multipart/form-data)
Query status	POST /v1/gettasks (form-data)
Check balance	GET /v1/balance
File format	.txt or .csv, one entry per line
Max batch size	1,000,000 entries per task

Authentication

All requests require your API key passed in the request header:

X-API-Key: YOUR_API_KEY

Task Status

Status	Meaning
pending	Task queued, waiting to start
processing	Task is being processed
exported	Results ready, download from result_url

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Product Catalog

Social Platform Registration Checkers

Telegram

Product	Task type	Return fields
NumberChecker	tg	number, activated
Activity Checker	tg_active	number, activated, uid, username, lastseen, activedays, member
Profile Checker	tg_avatar	Phone, activated, uid, username, Gender, Age, Ethnicity, Avatar, Last Online Time, Active Days, Is Member, first_name, last_name

WhatsApp

Product	Task type	Return fields
NumberChecker	ws	number, activated
Business Checker	ws_business	number, whatsapp, business
Activity Checker	ws_active	number, activated, activetime, activedays, business
Profile Checker	ws_avatar	number, activated, age, avatar, category, gender, hair_color, number, skin_color

NumberChecker

Product	Task type	Return fields
Validity Checker	phoneCheck	number, activated
Activity Checker	active_check	number, activated
High-Value Checker	high_value_users	Mobile Number, Result
E-commerce Checker	ecom_active	number, activated

Viber

Product	Task type	Return fields
NumberChecker	viber	number, activated
Activity Checker	viber_active	number, activated, mid, last_online_time, active_days
Profile Checker	viber_senior	number, activated, last_online_time, active_days, mid, nickname, person_count, avatar_type, age, skin_color, gender, avatar

iMessage

Product	Task type	Return fields
NumberChecker	imessage	number, activated

RCS

Product	Task type	Return fields
NumberChecker	rcs	number, activated, system

Signal

Product	Task type	Return fields
NumberChecker	signal	number, activated

VK

Product	Task type	Return fields
NumberChecker	vk	number, activated

Apple ID

Product	Task type	Return fields
NumberChecker	apple	number, activated
Email Checker	apple_email	email, activated

Facebook

Product	Task type	Return fields
NumberChecker	facebook	number, activated
Email Checker	facebook_email	email, activated

Amazon

Product	Task type	Return fields
NumberChecker	amazon	number, activated
Email Checker	amazon_email	email, activated

Instagram

Product	Task type	Return fields
NumberChecker	instagram	number, activated
Email Checker	instagram_email	email, activated

MAX

Product	Task type	Return fields
NumberChecker	max	number, activated
Profile Checker	max_full	number, activated

Netflix

Product	Task type	Return fields
NumberChecker	netflix	number, activated
Email Checker	netflix_email	email, activated

Line

Product	Task type	Return fields
NumberChecker	line	number, activated
Profile Checker	line_senior	number, activated

X (Twitter)

Product	Task type	Return fields
Email Checker	twitter_email	email, activated

Telegram (username)

Product	Task type	Return fields
Registration Checker	tg_username	username, activated, avatar_url
Activity Checker	tg_username_activity	username, activated, uid, lastseen, activedays, member, avatar_url

LinkedIn

Product	Task type	Return fields
NumberChecker	linkedin_phone	number, activated
Email Checker	linkedin	email, activated
Email Profile Checker	linkedin_profile	email, activated, first_name, last_name, gender, job_title, birth_year, inferred_salary, linkedin_url, phone

Zalo

Product	Task type	Return fields
NumberChecker	zalo	number, activated
Days Checker	zalo_active	number, activated, uid, nickname, active_time, active_days
Age & Gender Checker	zalo_gender	number, activated, uid, nickname, gender, age, skin_color, avatar_type, person_count, avatar

TikTok

Product	Task type	Return fields
NumberChecker	tiktok	number, activated, username, uid

Microsoft

Product	Task type	Return fields
NumberChecker	microsoft	number, activated

Snapchat

Product	Task type	Return fields
NumberChecker	snapchat	number, activated

Messenger

Product	Task type	Return fields
NumberChecker	messenger	number, activated

GoTo

Product	Task type	Return fields
NumberChecker	goto	number, activated

Shopee

Product	Task type	Return fields
NumberChecker	shopee	number, activated

Threads

Product	Task type	Return fields
NumberChecker	threads	number, activated

Spotify

Product	Task type	Return fields
Email Checker	spotify_email	email, activated

Band

Product	Task type	Return fields
NumberChecker	band	number, activated

DHL

Product	Task type	Return fields
NumberChecker	dhl	number, activated

Sideline

Product	Task type	Return fields
NumberChecker	sideline	Number, activated

Airbnb

Product	Task type	Return fields
NumberChecker	airbnb	number, activated

Pornhub

Product	Task type	Return fields
Email Checker	pornhub	email, activated

Temu

Product	Task type	Return fields
NumberChecker	temu	number, activated

Botim

Product	Task type	Return fields
NumberChecker	botim	number, activated
Age & Gender Checker	botim_gender	number, activated, gender, age

Wheely

Product	Task type	Return fields
Registration Checker	wheely	number, activated

PayPal

Product	Task type	Return fields
NumberChecker	paypal_number	number, activated
Email Checker	paypal_email	email, activated

BongaCams

Product	Task type	Return fields
Registration Checker	bongacams	email, activated

RusDate

Product	Task type	Return fields
Registration Checker	rusdate_email	email, activated

Rabota.ru

Product	Task type	Return fields
Registration Checker	rabota_phone	number, activated

Exchange Registration Checkers

Binance

Product	Task type	Return fields
NumberChecker	Binance	number, activated
Email Checker	binance_email	email, activated

KuCoin

Product	Task type	Return fields
NumberChecker	Kucoin	number, activated
Email Checker	kucoin_email	email, activated

HTX

Product	Task type	Return fields
NumberChecker	htx	number, activated
Email Checker	htx_email	email, activated

CoinW

Product	Task type	Return fields
NumberChecker	coinW	number, activated
Email Checker	coinw_email	email, activated

Crypto.com

Product	Task type	Return fields
NumberChecker	crypto	number, activated
Email Checker	crypto_email	email, activated

OKX

Product	Task type	Return fields
NumberChecker	okx	number, activated

Crypto Bot

Product	Task type	Return fields
Email Checker	cryptobot	email, activated

ID/Username Checkers

Instagram

Product	Task type	Return fields
ID/Username Profile Checker	instagram_profile	username, activated, avatar, visibility, ig_username, full_name, posts, followers, following, verified

Facebook

Product	Task type	Return fields
ID/Username Profile Checker	facebook_profile	username, activated, avatar, fb_id, fb_username, name, tagline, followers, talking_about

LinkedIn

Product	Task type	Return fields
Username Profile Checker	linkedin_username	username, activated, phone, email, avatar, avatar_url, name, location, country, company, followers, about, languages, current_title, education, experience

Email And Global Carrier Checkers

Email Deliverability Checker

Product	Task type	Return fields
Deliverability Checker	email_check	email, activated
Avatar Checker	email_avatar	email, activated, avatar, name

Global Carrier Checker

Product	Task type	Return fields
Global Carrier Checker	globalCarrier	number, number_type, country_code, carrier, underlying_carrier, region, city

US Carrier Advanced

Product	Task type	Return fields
US Carrier Advanced	us_carrier_premium	Number, number_type, carrier, city

Shared utilities

API	Description
Global Phone Carrier Inquiry	Legacy synchronous single-number carrier lookup; not part of the 74-product catalog.
Balance Query API	Query available account balance.