Phone Number Verification API

RESTful phone number verification API — validate numbers, check WhatsApp & Telegram registration, detect carriers, and verify 40+ apps programmatically. Python, Node.js, PHP, Go SDKs. 99.99% accuracy across 200+ countries.

Developer-First Phone Verification

Simple REST API with SDKs for Python, Node.js, PHP & Go. Webhook callbacks. Async batch processing. Start in 5 minutes.

Read Integration Guide

API Endpoints

POST /api/v1/verify — Single number verification
POST /api/v1/verify/bulk — Bulk verification (up to 100K per batch)
POST /api/v1/verify/async — Async verification with webhook callback
GET /api/v1/status/:job_id — Check async job status

Example Request

curl -X POST https://api.numbercheck.live/v1/verify \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "phone": "+12125551234",
    "checks": ["whatsapp", "telegram", "carrier", "format"]
  }'

# Response
{
  "phone": "+12125551234",
  "valid": true,
  "country": "US",
  "carrier": "Verizon Wireless",
  "line_type": "mobile",
  "whatsapp": true,
  "telegram": true,
  "whatsapp_business": false
}

SDKs & Languages

Pythonpip install numbercheck
Node.jsnpm i numbercheck
PHPcomposer require numbercheck
Gogo get numbercheck
RESTAny HTTP client

What the API Checks

CapabilityEndpointResponse Time
Format Validation (E.164)/verify< 100ms
Carrier Detection (HLR)/verify< 500ms
Line Type (Mobile/Landline/VoIP)/verify< 100ms
WhatsApp Registration/verify< 300ms
Telegram Registration/verify< 300ms
40+ App Detection/verify< 2s (all apps)
Bulk Verification/verify/bulk100K / 5 min
Async + Webhook/verify/asyncWebhook on completion

Why Choose This API

Multi-Source Verification

Unlike APIs that only check format, our API performs multi-path verification: HLR lookups (carrier-level), SS7 signaling (network-level), and direct app API queries (platform-level). When one path fails, automatic fallback ensures maximum accuracy. How the technology works →

Global Coverage

200+ countries with local carrier interconnects. Reliable verification across Southeast Asia, Middle East, Latin America, Africa, and all major markets. Not just US/EU — we specialize in emerging markets where other APIs fail. Country coverage guide →

Developer Experience

Clean RESTful design, consistent JSON responses, comprehensive error codes. SDKs for Python, Node.js, PHP, Go with full type hints. Webhook callbacks, async processing, rate limiting controls. Built by developers, for developers.

Use Cases

Frequently Asked Questions

What is a phone number verification API?

A phone number verification API is a RESTful web service that programmatically validates phone numbers. It checks format validity (E.164 standard), carrier status (HLR lookup), line type (mobile/landline/VoIP), and app registration status (WhatsApp, Telegram, Facebook, etc.). Developers integrate it via HTTP requests to validate numbers in real-time or batch.

What SDKs and languages are supported?

We provide official SDKs for Python, Node.js, PHP, and Go. The API is RESTful and language-agnostic — any language that can make HTTP requests (Java, Ruby, C#, Rust, etc.) can integrate directly. See the API integration guide for code examples and quickstart tutorials.

How does the bulk verification API work?

The bulk API accepts arrays of phone numbers via POST request, processes them in parallel across multiple carrier APIs, and returns structured JSON results classifying each number as active, inactive, or invalid. For large batches (10K+), use the async endpoint with webhook callbacks. Processing speed: 100K numbers in under 5 minutes.

Is there a free tier for the phone verification API?

We offer free web-based tools for individual number checks. For API access, plans start at $1 per 10,000 verifications. Contact us on Telegram (@ayongzhanshen) for developer accounts, testing credits, and enterprise pricing with custom SLAs.

How accurate is the phone verification API?

99.99% accuracy through multi-path verification: HLR (Home Location Register) lookups, SS7 signaling queries, and direct carrier API integrations. When one verification path fails, an automatic fallback verifies through an alternative channel. This ensures maximum reliability even in regions with unreliable carrier infrastructure.

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About Phone Verification API Tester

Welcome to the Phone Verification API Tester, a powerful and 100% free browser-based utility engineered to deliver fast, reliable, and private solutions for phone verification api tester. Whether you are a web developer, digital marketer, student, or business professional, this tool streamlines complex workflows into simple, automated actions without requiring software downloads or account registrations. With full client-side processing, you can work with confidence knowing that your sensitive data, files, and inputs are processed locally in your device memory and never leave your computer.

Optimized for high-volume productivity, our test sms verification endpoint provides real-time validation, responsive visual feedback, and cross-platform compatibility across desktop, tablet, and mobile devices. Explore the complete functionality of phone number auth tester to speed up daily tasks, eliminate manual human error, and achieve pixel-perfect results in seconds. Built by senior SEO and web strategist TechErics Tools, this tool is part of our suite of 170+ free utilities designed to empower creators and businesses worldwide.

Cryptographic Security Standards & Entropy Ratings

Security benchmarks and algorithmic specifications:

Security Standard Algorithm Details Entropy / Resistance
Randomness SourceWeb Crypto API (`window.crypto.getRandomValues`)CSPRNG (Cryptographically Secure Pseudo-Random)
Hash FunctionsNIST FIPS 180-4 (SHA-256, SHA-512)Collision-resistant one-way cryptographic hashing
Symmetric CipherNIST FIPS 197 (AES-256 CBC/GCM)Military-grade symmetric encryption
Zero-Knowledge Guarantee100% Client-side browser executionNo telemetry, database logging, or transmission

How to Use This Tool in 4 Simple Steps

  1. 1Enter target phone number and API verification endpoint.
  2. 2Trigger OTP or verification payload simulation.
  3. 3Inspect server response status, headers, and authentication token.
  4. 4Copy, download, or share your final output with one-click clipboard integration.

Key Features & Security Highlights

⚡
Instant Processing

Executes locally in your web browser with zero server lag.

🛡️
100% Private & Secure

Your inputs and files never leave your computer or device.

🎁
Unlimited Free Use

No paywalls, no credits, no daily quotas, and no registration.

📱
Cross-Device Ready

Works smoothly across desktop, tablet, and mobile browsers.

Frequently Asked Questions

Can this tool simulate 2FA / OTP verification flows?

Yes, it inspects REST request and response cycles for SMS/telephony verification providers.

Can I use Phone Verification API Tester for free commercial and business projects?

Yes, Phone Verification API Tester is 100% free for both personal and commercial use with zero attribution requirements, licensing fees, or hidden paywalls.

Does Phone Verification API Tester store or log my sensitive input data?

No. All computational logic executes locally within your browser sandbox. No input strings, files, or parameters are ever uploaded or transmitted across any third-party servers.

What browsers and operating systems support Phone Verification API Tester?

The tool is compatible with all modern web browsers including Google Chrome, Apple Safari, Mozilla Firefox, Microsoft Edge, and works on Windows, macOS, Linux, Android, and iOS.