Amazon Email Checker API: Fast Email Verification

Check whether the input email addresses are registered with Amazon

Upload Detection File Code example:

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

Check Task Status Code example:

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

Response for the upload detection file successful

{
    "task_id": "d4g8o46p2jvh04o9uolg",
    "status": "pending",
    "total": 2049,
    "estimated_amount": {
        "amount": "0.500000",
        "currency": "USD"
    },
    "message": "Task created successfully",
    "created_at": "2025-11-21T15:58:08.916446594Z"
}

Response for the processing status

{
    "created_at": "2025-11-21T08:27:09.933Z",
    "updated_at": "2025-11-21T08:27:10.241Z",
    "task_id": "d4g24nep2jvh04o9uoh0",
    "user_id": "wfi7wGPS4B4PdtTMox5Y",
    "status": "processing",
    "total": 2049,
    "success": 1024,
    "failure": 0
}

Provide a response indicating the task is completed and include the download URL for the results.

{
    "created_at": "2025-11-21T08:27:09.933Z",
    "updated_at": "2025-11-21T08:27:10.241Z",
    "task_id": "d4g24nep2jvh04o9uoh0",
    "user_id": "wfi7wGPS4B4PdtTMox5Y",
    "status": "exported",
    "total": 2049,
    "success": 2049,
    "failure": 0,
    "result_url": "https://wapic.s3.ap-southeast-1.amazonaws.com/externalcheck/d4g24nep2jvh04o9uoh0/d4g24nep2jvh04o9uoh0.zip?X-Amz-Algorithm=AWS4-HMAC-SHA256...",
    "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`, Upload file, each line should contain one email address
`task_type`	`string`, Task type, set to “amazon_email”

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	Example
`Email`	Email address	user@example.com
`amazon`	Whether email is registered with Amazon	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`	ID of user
`status`	Task status: `pending`: Queued and waiting `processing`: Currently processing `exported`: Results available for download `failed`: Task failed, the charged amount is refunded automatically
`total`	Total email addresses processed
`success`	Emails successfully verified
`failure`	Emails that failed processing
`result_url`	(Optional) Download URL for results 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