STELLAR_TX_BAD_SEQ

The transaction sequence number is not the next expected one for the source account.

409 Conflict · transaction submission

Example

{
  "type": "https://docs.trustlesswork.com/trustless-work/v2-en/api-rest/errors/stellar-tx-bad-seq",
  "title": "Conflict",
  "status": 409,
  "code": "STELLAR_TX_BAD_SEQ",
  "detail": "The transaction sequence number is not the next expected one for the source account. Reload the account and rebuild.",
  "instance": "/…",
  "traceId": "…"
}

When it happens

The transaction's sequence number is stale — the source account moved on (another tx consumed it, or you re-submitted an old envelope).

How to fix it

Rebuild the transaction (call the build endpoint again), sign, and submit the fresh XDR.