# NumDetect, $19.90 pack, Basic, POST /api/v1/checks, Single check, WhatsApp Business: Phone validation API

> See which apps a phone number uses before you reach out.

NumDetect's Basic plan for the phone validation API costs $4.00 per 1,000 phones. We check each provider's docs for 9 fields. NumDetect's docs list 2: Validity, Place.
We haven't run NumDetect through [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt) yet.
We rank 1,494 plans for phone validation APIs by price. Half the plans cost $3.20 or less per 1,000 phones. This plan costs less per 1,000 phones than 45% of the 1,494 plans.
[Linq's $260 monthly plan](https://datacircle.dev/validate-phone-apis/linq/260-monthly-pro-post-v3-capability-check-imessage/llms.txt) is the cheapest paid plan per 1,000 phones. Linq's phone validation API costs nothing beyond the plan price. [Keyronne's pay-as-you-go plan](https://datacircle.dev/validate-phone-apis/keyronne/pay-as-you-go/llms.txt) costs the least for 10,000 phones a month: $0.20.
[Trestle](https://datacircle.dev/validate-phone-apis/trestle/top-up-from-10-self-serve-pay-as-you-go-get-3-0-phone-intel-phone-validation-api/llms.txt), [Signal House](https://datacircle.dev/validate-phone-apis/signal-house/top-up-from-10/llms.txt) and [Data247](https://datacircle.dev/validate-phone-apis/data247/12-pack-membership-get-v3-0-verify247-phone/llms.txt) are the best phone validation API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-phone-apis/numdetect/19-90-pack-basic-post-api-v1-checks-single-check-whatsapp-business
- [Phone validation API in 2026: the best of 60+ compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://numdetect.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Request: `POST https://api.numdetect.com/api/v1/checks`, Single check, WhatsApp Business
- API key: with the plan, on https://numdetect.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Its API docs: https://numdetect.com/docs/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing#single
- Sold by: NumDetect (https://numdetect.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-12

## In the answer

- Completeness: 22%
- Validity: ✓
- Place: ✓

## Price

- $ per 1,000 phones: $4.00
- Per: call
- Billing: pay first

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Bulk check

## Overage

- Units cap: hard

## Not found

- $ per 1,000 calls that find nothing: $0.00

## In their words

- Their pitch: See which apps a phone number uses before you reach out.

## Data

- Freshness: live
- What it checks: messaging apps
- Keep data: no limit
- Use data: Do not share access in a way that bypasses service limits. [...] Use only data you are entitled to process. Do not use the service for spam, harassment, unlawful surveillance, unauthorized access or attempts to bypass safeguards. Registration and Business signals do not prove identity, ownership, consent, recent activity or guaranteed message delivery. Do not treat unknown as a negative answer or use a signal as the sole basis for a decision with significant effects on a person.

## Plan

- Pay: $19.90
- You get: $19.90
- Enough for: 4,975 calls

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: phone, products "whatsapp_business", Content-Type header "application/json", Idempotency-Key header. Optional: country
- Method: POST
- Path: /api/v1/checks

## About the plan

- Plan: Basic
- Who can get it: anyone who signs up, no approval step

## The 11 fields the plan's answer can hold

check ID, input type, input, country, amount charged, product ID, status, registered, product price, product amount charged, extra info

## NumDetect's plans (4)

- [NumDetect, $19.90 pack, Basic, POST /api/v1/checks, Single check, WhatsApp Business](https://datacircle.dev/validate-phone-apis/numdetect/19-90-pack-basic-post-api-v1-checks-single-check-whatsapp-business/llms.txt): $4.00 per 1,000, 22% complete, live
- [NumDetect, $69.90 pack, Plus, POST /api/v1/checks, Single check, WhatsApp Business](https://datacircle.dev/validate-phone-apis/numdetect/69-90-pack-plus-post-api-v1-checks-single-check-whatsapp-business/llms.txt): $3.784 per 1,000, 22% complete, live
- [NumDetect, $199.90 pack, Professional, POST /api/v1/checks, Single check, WhatsApp Business](https://datacircle.dev/validate-phone-apis/numdetect/199-90-pack-professional-post-api-v1-checks-single-check-whatsapp-business/llms.txt): $3.636 per 1,000, 22% complete, live
- [NumDetect, $499.90 pack, Scale, POST /api/v1/checks, Single check, WhatsApp Business](https://datacircle.dev/validate-phone-apis/numdetect/499-90-pack-scale-post-api-v1-checks-single-check-whatsapp-business/llms.txt): $3.333 per 1,000, 22% complete, live

## NumDetect's calls (10)

- `POST /api/v1/bulk-jobs`, Bulk check, Telegram: [NumDetect, $19.90 pack, Basic, POST /api/v1/bulk-jobs, Bulk check, Telegram](https://datacircle.dev/validate-phone-apis/numdetect/19-90-pack-basic-post-api-v1-bulk-jobs-bulk-check-telegram/llms.txt)
- `POST /api/v1/bulk-jobs`, Bulk check, Viber: [NumDetect, $19.90 pack, Basic, POST /api/v1/bulk-jobs, Bulk check, Viber](https://datacircle.dev/validate-phone-apis/numdetect/19-90-pack-basic-post-api-v1-bulk-jobs-bulk-check-viber/llms.txt)
- `POST /api/v1/bulk-jobs`, Bulk check, WhatsApp: [NumDetect, $19.90 pack, Basic, POST /api/v1/bulk-jobs, Bulk check, WhatsApp](https://datacircle.dev/validate-phone-apis/numdetect/19-90-pack-basic-post-api-v1-bulk-jobs-bulk-check-whatsapp/llms.txt)
- `POST /api/v1/bulk-jobs`, Bulk check, WhatsApp Business: [NumDetect, $19.90 pack, Basic, POST /api/v1/bulk-jobs, Bulk check, WhatsApp Business](https://datacircle.dev/validate-phone-apis/numdetect/19-90-pack-basic-post-api-v1-bulk-jobs-bulk-check-whatsapp-business/llms.txt)
- `POST /api/v1/bulk-jobs`, Bulk check, Zalo: [NumDetect, $19.90 pack, Basic, POST /api/v1/bulk-jobs, Bulk check, Zalo](https://datacircle.dev/validate-phone-apis/numdetect/19-90-pack-basic-post-api-v1-bulk-jobs-bulk-check-zalo/llms.txt)
- `POST /api/v1/checks`, Single check, Telegram: [NumDetect, $19.90 pack, Basic, POST /api/v1/checks, Single check, Telegram](https://datacircle.dev/validate-phone-apis/numdetect/19-90-pack-basic-post-api-v1-checks-single-check-telegram/llms.txt)
- `POST /api/v1/checks`, Single check, Viber: [NumDetect, $19.90 pack, Basic, POST /api/v1/checks, Single check, Viber](https://datacircle.dev/validate-phone-apis/numdetect/19-90-pack-basic-post-api-v1-checks-single-check-viber/llms.txt)
- `POST /api/v1/checks`, Single check, WhatsApp: [NumDetect, $19.90 pack, Basic, POST /api/v1/checks, Single check, WhatsApp](https://datacircle.dev/validate-phone-apis/numdetect/19-90-pack-basic-post-api-v1-checks-single-check-whatsapp/llms.txt)
- `POST /api/v1/checks`, Single check, WhatsApp Business: [NumDetect, $19.90 pack, Basic, POST /api/v1/checks, Single check, WhatsApp Business](https://datacircle.dev/validate-phone-apis/numdetect/19-90-pack-basic-post-api-v1-checks-single-check-whatsapp-business/llms.txt)
- `POST /api/v1/checks`, Single check, Zalo: [NumDetect, $19.90 pack, Basic, POST /api/v1/checks, Single check, Zalo](https://datacircle.dev/validate-phone-apis/numdetect/19-90-pack-basic-post-api-v1-checks-single-check-zalo/llms.txt)

## NumDetect's APIs (1)

- [NumDetect Phone validation API pricing, 4 plans, POST /api/v1/checks, Single check, WhatsApp Business](https://datacircle.dev/validate-phone-apis/numdetect/19-90-pack-basic-post-api-v1-checks-single-check-whatsapp-business/llms.txt)

## NumDetect: phone validation API alternatives

[NumDetect alternatives: other phone validation API providers by price](https://datacircle.dev/numdetect-alternatives.txt)

We list other providers' plans closest to this plan in price per 1,000 phones. Each plan in the list gives live data.

- [Dexatel, pay as you go, 2M - 5M lookups](https://datacircle.dev/validate-phone-apis/dexatel/pay-as-you-go-2m-5m-lookups/llms.txt): $4.00 per 1,000, 67% complete, live
- [ProWebLook, $400 pack, WhatsApp One-Time 100K, GET /wavalidation](https://datacircle.dev/validate-phone-apis/proweblook/400-pack-whatsapp-one-time-100k-get-wavalidation/llms.txt): $4.00 per 1,000, 67% complete, live
- [Plivo, top-up from $25](https://datacircle.dev/validate-phone-apis/plivo/top-up-from-25/llms.txt): $4.00 per 1,000, 67% complete, live
- [2Chat, $480 yearly, Basic Plan, GET /open/whatsapp/check-number/{your-number}/{number-to-check}, Check Number, full](https://datacircle.dev/validate-phone-apis/2chat/480-yearly-basic-plan-get-open-whatsapp-check-number-your-number-number-to-check-check-number-full/llms.txt): $4.00 per 1,000, 33% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-12.

- https://numdetect.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://numdetect.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://numdetect.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://numdetect.com/privacy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://numdetect.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing