LinkedIn NumberChecker API: Bulk Phone Verification

Check whether phone numbers in your file are registered on LinkedIn. Only United States (US) and India (IN) numbers are supported. Same batch task workflow as other checkers.

Upload detection file — example:

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

Check task status — example:

curl --location 'https://api.numberchecker.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.numberchecker.ai/v1/tasks

Upload file request parameters

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

Check task status request URL

POST https://api.numberchecker.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
`activated`	Whether the account is registered/activated (`yes` / `no`)

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