Stacks Mempool Inspector

Inspect pending (unconfirmed) Stacks transactions. By address: list a wallet's outgoing and incoming mempool txs with fee, nonce, type, and age. By tx id: get the transaction's fee, nonce, and age plus a "stuck" diagnosis — its fee compared against live mempool fee percentiles for its tx type, and a sender nonce-gap check (the most common reason a tx won't confirm regardless of fee).