Cian Checker API: Bulk Phone Number Verification

Check whether phone numbers in your file have Cian.ru accounts. Same batch task workflow as other social / messenger checkers.

Upload detection file — example:

curl --location 'https://api.checknumber.ai/v1/tasks' \
--header 'X-API-Key: API-KEY' \
--form 'file=@"./numbers.txt"' \
--form 'task_type="cian"'

Check task status — example:

curl --location 'https://api.checknumber.ai/v1/gettasks' \
--header 'X-API-Key: API-KEY' \
--form 'task_id="task_id"'

Response after upload succeeds

{
    "task_id": "d4g8o46p2jvh04o9uolg",
    "status": "pending",
    "total": 2049,
    "estimated_amount": {
        "amount": "0.500000",
        "currency": "USD"
    },
    "message": "Task created successfully",
    "created_at": "2026-04-28T11:58:08.916446594Z"
}

Response while processing

{
    "created_at": "2026-04-28T08:27:09.933Z",
    "updated_at": "2026-04-28T08:27:10.241Z",
    "task_id": "d4g24nep2jvh04o9uoh0",
    "user_id": "wfi7wGPS4B4PdtTMox5Y",
    "status": "processing",
    "total": 2049,
    "success": 1024,
    "failure": 0
}

Response when finished (exported)

{
    "created_at": "2026-04-28T08:27:09.933Z",
    "updated_at": "2026-04-28T08:27:10.241Z",
    "task_id": "d4g24nep2jvh04o9uoh0",
    "user_id": "wfi7wGPS4B4PdtTMox5Y",
    "status": "exported",
    "total": 2049,
    "success": 2049,
    "failure": 0,
    "result_url": "https://example-link-to-results.zip",
    "actual_amount": {
      "amount": "2.000000",
      "currency": "USD"
    }
}

Upload file request URL

POST https://api.checknumber.ai/v1/tasks

Upload file request parameters

Parameter	Description
file	file, one phone number per line (E.164 format)
task_type	string, set to cian

Check task status request URL

POST https://api.checknumber.ai/v1/gettasks

Check task status request parameters

Parameter	Description
task_id	string, Task ID returned from task creation

Result fields

Field	Description
Number	Phone number in E.164 format
cian	Whether the number is registered on Cian.ru (yes / no style; labels per export)

Response format

Field	Description
created_at	Timestamp when task was created
updated_at	Timestamp of last task status update
task_id	Unique task identifier
user_id	User ID
status	pending · processing · exported · failed (refunded automatically)
total	Total phone numbers processed
success	Numbers successfully identified
failure	Numbers that failed processing
result_url	Download URL when status is exported
actual_amount	(Optional) Actual charged amount, returned after the task is settled
estimated_amount	(Create response) Estimated amount for the task; the final charge is settled when the task completes

Status codes

Status	Description
200	free, Request successful (e.g. status query)
202	charge, Task created successfully; the estimated amount is deducted
400	free, Bad request: invalid parameters or file format, unsupported task type, or fewer valid entries than the minimum batch size
401	free, Missing or invalid API key
402	free, Insufficient account balance
404	free, Task not found
413	free, Uploaded file too large
500	free, Internal server error, retry later