NONCE_IN_FLIGHT

Another intent already holds this nonce.

HTTP status	409
Group	Relay path
Retryable	Yes — the same request may be sent again
Re-sign	SAME_BYTES — resend the transaction you already have, byte for byte

What happened

One nonce carries one transaction at a time; a second signature for it would be a second send.

What to do

If resign is SAME_BYTES, resend the identical bytes — that is safe. Otherwise wait for the in-flight intent to settle, or cancel it.

Extra members

This code carries occupiedBy, pinnedNonce in the problem document, on top of the common members.

The problem document

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

{
  "type": "https://docs.co-relayer.com/errors/nonce-in-flight",
  "title": "Another intent already holds this nonce.",
  "status": 409,
  "detail": "A sentence about this specific occurrence.",
  "instance": "req_01JB…",
  "code": "NONCE_IN_FLIGHT",
  "retryable": true,
  "resign": "SAME_BYTES",
  "hint": "If `resign` is `SAME_BYTES`, resend the identical bytes — that is safe. Otherwise wait for the in-flight intent to settle, or cancel it."
}

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