Validity check (real & active)
Determine whether a phone number appears valid, assigned, and currently in service.
Phone validation API · Batch jobs · CSV in/out
Bulk Phone Validation API: Batch CSV Jobs
Validate large phone lists via API | submit batch jobs, enrich with carrier and line-type data, export clean segments for campaigns and CRM cleanup.
Throughput
10K/min batch
Input
CSV / API
Coverage
240+ countries
POST /api/v1/detect
curl -X POST "https://api.bulkchecker.io/api/v1/detect" \
-H "X-API-Key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"product": "phone-status-check",
"country": "US",
"phones": ["+14155550198", "+442071838750"]
}'Response preview
validtrue
line_typemobile
carrierdetected
risk_score8
Capabilities
API Capabilities
Use one API to validate phone quality, enrich records, and segment low-quality numbers before CRM or campaign workflows.
Carrier & line type
Identify carrier and classify mobile, landline, VoIP, toll-free, and other line types.
Risk scoring
Flag unusual, disposable, or low-quality phone signals before outreach, CRM import, or manual review.
Country/region detection
Resolve country, region, and normalized international phone format for storage and routing.
3-minute integration
API request and response example
Batch job and CSV API workflow: create a key, normalize numbers with E.164 Phone Number Format, review mixed-country input with Validate International Phone Numbers, clean messy uploads with Data Scrubber, then submit a batch job and segment clean, risky, and invalid numbers from the JSON response.
Get your API key
Create a key in the BulkChecker app API Center and keep it on your server.
Submit your first batch
curl -X POST "https://api.bulkchecker.io/api/v1/detect" \
-H "X-API-Key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"product": "phone-status-check",
"country": "US",
"phones": ["+14155550198", "+442071838750"]
}'Sample batch response
{
"mode": "async",
"task_id": "xKj9aP3qLm7v",
"message": "Task queued.",
"summary": {
"total": 5000,
"cost_deducted": 0.500000
}
}Reference
Endpoints Overview
Use the unified BulkChecker API: submit a product slug with phone numbers, upload a file, then poll the task and download results.
POST
POST /api/v1/detect
Submit phone arrays with a product slug for async background processing.
GET
POST /api/v1/detect/file
Upload CSV or TXT files for larger list-cleaning workflows.
GET
GET /api/v1/tasks/{task_id}
Poll progress, then request the result download URL when the task is complete.
Integration stack
SDKs & Integrations
Ship validation in your existing backend stack with simple request patterns and predictable JSON responses.
Python
Node
Ruby
PHP
.NET
Volume tiers
Pricing
Start at $0.001 per lookup, then move into higher-volume tiers as validation traffic grows.
| Monthly volume | Price / lookup | Best for | Included |
|---|---|---|---|
| 0 - 100K | $0.0010 | Testing and early production | Single lookup, bulk endpoint, API dashboard |
| 100K - 1M | $0.0008 | Growth teams and CRM automation | Priority queue, usage alerts, CSV exports |
| 1M - 10M | $0.0006 | High-volume validation | Bulk jobs, team access, higher rate limits |
| 10M+ | Custom | Enterprise data operations | Higher volume, priority processing, and custom support |
Developer workflows
Use Cases for List and Data Teams
Add validation wherever phone quality affects deliverability, segmentation, or data hygiene.
Bulk list cleaning workflow
Validate imported CRM lists and marketing audiences before sending SMS or WhatsApp campaigns.
Pre-campaign list enrichment
Add carrier, line type, country, and quality signals before you split, suppress, or export campaign lists.
CRM data hygiene jobs
Refresh stale phone fields, remove invalid records, and keep sales or RevOps lists easier to segment.
Comparison
Compare with Twilio Lookup / Numverify API
Compare validation scope, bulk support, pricing, and developer workflow fit before choosing an API.
| Feature | bulkchecker.io | Twilio Lookup | Numverify API |
|---|---|---|---|
| Bulk CSV endpoint | Built in | Custom workflow | Limited |
| Single-number spot check | Available | Available | Basic lookup |
| Risk scoring | Included | Depends on setup | Not primary |
| Entry price | $0.001 / lookup | Usage-based | Plan-based |
FAQ
FAQ
Short answers for developers evaluating the bulkchecker.io Phone Validation API.
What's your API rate limit?
Rate limits depend on plan and volume tier. Higher-volume plans include higher throughput and optional dedicated limits.
Do you support webhook notifications?
Yes. Webhook notifications can be used for bulk validation jobs, completed exports, and async workflow updates.
Do you support larger jobs?
Higher-volume plans can include priority processing, dedicated support, and custom operational requirements.
What about data privacy?
The API is designed for server-side validation, controlled access, and privacy-aware handling of phone data.
Can I test for free?
Yes. Developers can run a free test to validate integration behavior before moving to production volume.
Is this a phone validator API and bulk phone validation API?
Yes. The API supports single and batch checks for phone validation. Send one number for a spot check, or submit arrays of numbers for list cleaning and high-volume jobs.
Do you offer a phone number verification API with line type and risk score?
Yes. The phone number verification API returns line type (mobile, landline, VoIP), carrier name, country code, and a risk score per number. Suitable for list cleaning, CRM enrichment, and campaign prep.
Get started with phone validation
Clean phone lists before campaigns and CRM import.
支柱页
Phone Validation API
This section covers the long-tail intent "Phone Validation API" inside the parent page instead of creating a duplicate URL. It connects the query to Phone Validation API and gives users a clear next step.
When to use it
Use this section when the list specifically needs Phone Validation API rather than a broad product overview.
What to check
Confirm input ownership, phone format, confidence, and the export segment needed downstream.
Where to go next
Open Phone Validation API or the related API page when this check should run at scale.
Phone validation cluster
Related phone validation pages
Phone Validation GuidePillar guide for phone number verification, validation methods, and list hygiene.Phone List CleaningClean phone lists before SMS, WhatsApp, CRM import, and campaign workflows.Data ScrubberScrub CSV contact files before validation, enrichment, CRM import, or outreach.E.164 Phone Number FormatNormalize international phone numbers before validation, API jobs, and CRM imports.UK Phone Number CheckerValidate UK mobile, landline, and VoIP numbers for campaign-ready lists.Validate International Phone NumbersValidate mixed-country phone lists with E.164, carrier, and line type signals.Lead EnrichmentAdd phone, carrier, line type, and messaging signals to bulk lead files.Lead ScreeningFilter invalid, risky, duplicate, and wrong-channel leads before outreach.Bulk Phone Number ValidatorValidate thousands of numbers from CSV files and export clean segments.Bulk Phone ValidatorValidate phone lists in bulk before CRM, SMS, and outreach workflows.Free Phone ValidatorRun a quick single-number check before scaling to batch validation.Best Phone ValidatorsCompare validation tools, use cases, and buyer-fit tradeoffs.
AI answer engines
Request an AI summary of BulkChecker
Open BulkChecker in your preferred AI assistant to review its bulk WhatsApp, Telegram, phone validation, carrier lookup, social account, crypto exchange, CSV upload, and API workflows.
The prompt points assistants to BulkChecker.io, live pricing, product pages, and API documentation.