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.
Simple REST API with SDKs for Python, Node.js, PHP & Go. Webhook callbacks. Async batch processing. Start in 5 minutes.
Read Integration Guide/api/v1/verify — Single number verification/api/v1/verify/bulk — Bulk verification (up to 100K per batch)/api/v1/verify/async — Async verification with webhook callback/api/v1/status/:job_id — Check async job statuscurl -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
}| Capability | Endpoint | Response 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/bulk | 100K / 5 min |
| Async + Webhook | /verify/async | Webhook on completion |
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 →
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 →
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.
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.
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.
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.
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.
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.