Get the latest nonce used by an account

Retrieves the latest nonce values used by an account by inspecting the mempool, microblock transactions, and anchored transactions.

Path Parameters
principal string — REQUIRED Stacks address

Query Parameters
block_height number Optionally get the nonce at a given block height.
block_hash string Optionally get the nonce at a given block hash. Note - Use either of the query parameters but not both at a time.

Responses

200 Success Schema — OPTIONAL last_mempool_tx_nonce integer The latest nonce found within mempool transactions sent by this address. Will be null if there are no current mempool transactions for this address. last_executed_tx_nonce integer The latest nonce found within transactions sent by this address, including unanchored microblock transactions. Will be null if there are no current transactions for this address. possible_next_nonce integer The likely nonce required for creating the next transaction, based on the last nonces seen by the API. This can be incorrect if the API's mempool or transactions aren't fully synchronized, even by a small amount, or if a previous transaction is still propagating through the Stacks blockchain network when this endpoint is called. detected_missing_nonces integer[] Nonces that appear to be missing and likely causing a mempool transaction to be stuck. detected_mempool_nonces integer[] — OPTIONAL Nonces currently in mempool for this address.