NONCE_GAP

The nonce skips ahead of the account nonce and the pool.

HTTP status	409
Group	Relay path
Retryable	No — sending it again changes nothing
Re-sign	NONE — do not ask the user to sign anything

What happened

MultiversX executes nonces in order; a gap would leave the transaction stuck.

What to do

Fill the gap first, or rebuild at the next usable nonce and sign once.

The problem document

Every error is application/problem+json (RFC 9457) with the same shape:

{
  "type": "https://docs.co-relayer.com/errors/nonce-gap",
  "title": "The nonce skips ahead of the account nonce and the pool.",
  "status": 409,
  "detail": "A sentence about this specific occurrence.",
  "instance": "req_01JB…",
  "code": "NONCE_GAP",
  "retryable": false,
  "resign": "NONE",
  "hint": "Fill the gap first, or rebuild at the next usable nonce and sign once."
}

See the error model for what each member means and how to handle unknown codes.