Integrate · Last updated April 23, 2026

Response format

When you POST JSON (for example with fetch), the submit endpoint always responds with JSON. Classic HTML form POSTs redirect to a success page instead — see Custom redirects.

Success

A 200 response confirms the submission was stored.

JSONresponse.json

{
  "success": true,
  "message": "Submission received successfully"
}

Errors

Errors come back with an error key and a human-friendly message.

JSONresponse.json

{
  "error":   "Submission limit reached",
  "message": "Your monthly submission limit has been reached."
}

Status codes

Status	Meaning
`200 OK`	Submission stored and any webhooks / emails queued.
`400 Bad Request`	The payload was missing required fields or could not be parsed as JSON or form-encoded data.
`404 Not Found`	The form ID in the URL does not exist or has been deleted.
`429 Too Many Requests`	You hit your monthly submission limit. Upgrade your plan or wait for the next billing period — see Rate limits.
`500 Server Error`	Something blew up on our side. Safe to retry — submissions are idempotent by request ID.