Zalo account check
Check if a phone number has a Zalo account, singly or in bulk. $0.001 per single check, $0.0005 per check in bulk. Unknown single checks are free.
- Single-check price · USD per check
- $0.001
- Bulk price · USD per check
- $0.0005
What this product checks
Use the Zalo phone-number product for its own account signal. A result from another messaging platform cannot substitute for a Zalo check.
Reading the result
A conclusive yes or no describes the account signal at the time of checking. Unknown means no conclusive answer; it must not be treated as no. A registration signal does not verify identity, consent or message delivery.
Where teams use Zalo checks
- Prepare Vietnamese contact lists, where Zalo is the main messaging app.
- See which customer numbers can be reached on Zalo before setting up a Zalo flow.
- Run Zalo next to WhatsApp or Viber for lists that mix Vietnamese and international numbers.
Cost example for Zalo
−50%
1,000 valid unique numbers from one country cost $0.50 at the bulk price ($0.0005 each). A country with only 300 numbers is still checked and is billed as the minimum number of checks: $0.25. Checking the 1,000 numbers one by one at the single-check price would cost $1.00.
This is the cost shown before you submit. Duplicates and invalid rows are removed first; a completed list is charged this amount, unknown results included, and a failed list is refunded in full.
How pricing worksRelated workflow
Before reaching out, see which app a number usesFor one number or a whole list, check WhatsApp, Telegram, Viber and more at once. Each number's results sit together, so you can see which channel fits. →Zalo check questions
How much does each Zalo check cost?
$0.001 per single check, in real time. In a bulk task each country is its own group at $0.0005 per check; a country with only a few numbers is billed as the minimum number of checks. A group is charged in full once its batch completes, unknown rows included, and refunded if the batch fails.
Is an unknown Zalo result charged?
Not in a single check: only a conclusive answer is charged. In bulk, yes: each country is charged in full once it completes, unknown rows included; a list that fails is refunded. Invalid rows and duplicates cost nothing.
Can I check Zalo through the API?
Yes. Send POST /api/v1/checks with the product ID zalo for one input, or POST /api/v1/bulk-jobs with a file for a list.
Example request
Developerscurl "https://api.numdetect.com/api/v1/checks" \
-H "Authorization: Bearer $NUMDETECT_API_KEY" \
-H "Content-Type: application/json" \
-H "Idempotency-Key: $(uuidgen)" \
-d '{
"phone": "+12025550147",
"products": [
"zalo"
]
}'Illustrative request with a sample number. Replace $NUMDETECT_API_KEY with your key; each run is a real, charged check.
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