LEASE_MISSING

The relay request arrived without the lease returned by the assign call.

HTTP status	400
Group	Relay path
Retryable	No — sending it again changes nothing
Re-sign	NONE — do not ask the user to sign anything

What happened

On the native relay path the lease is what proves the relayer in the transaction is the one we handed out, and how recently.

What to do

Call the assign endpoint first and send the lease it returns with the transaction.

The problem document

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

{
  "type": "https://docs.co-relayer.com/errors/lease-missing",
  "title": "The relay request arrived without the lease returned by the assign call.",
  "status": 400,
  "detail": "A sentence about this specific occurrence.",
  "instance": "req_01JB…",
  "code": "LEASE_MISSING",
  "retryable": false,
  "resign": "NONE",
  "hint": "Call the assign endpoint first and send the lease it returns with the transaction."
}

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