API Overview

Base URL

https://api.check.et/api/v1

All endpoints are HTTPS only. HTTP requests are redirected.

Send Content-Type: application/json for JSON bodies. For file uploads, send multipart/form-data.

All endpoints require a bearer token:

Authorization: Bearer chk_xxxx

Every response returns JSON. Successful responses have HTTP 2xx status codes:

{
  "success": true,
  "exists": true,
  "duplicate": false,
  "message": null,
  "data": { ... }
}

Error responses have 4xx or 5xx codes:

{
  "message": "The transaction_number field is required."
}

For validation errors:

{
  "message": "The given data was invalid.",
  "errors": {
    "bank": ["The bank field is required."]
  }
}

Code	Meaning
`200`	Success - transaction verified
`400`	Bad request - invalid input
`401`	Unauthenticated - missing or invalid API key
`403`	Forbidden - your key lacks permission
`404`	Not found - transaction could not be verified
`422`	Validation error - see `errors` field
`429`	Rate limited
`500`	Server error - retry with exponential back-off

Plan	Monthly verifications
Free	200
Pro	Unlimited

When the monthly quota is exhausted the API returns 402 Payment Required. Upgrade at check.et/dashboard/billing.