Whether a transaction succeeded, on ETH/BNB/BASE/STABLE/SOL

Whether the transaction succeeded, and a human-readable failure reason when it did not and one exists. Served on ETH, BNB, BASE, STABLE and SOL; every other chain returns 400. The transaction endpoint serves all five of these too and answers the same question and more (who sent it, which tokens moved, a decoded failure reason), so the two are a cost choice rather than a coverage split: prefer that one when you want any of the rest, and this one when the outcome is all you need. Where both answer they agree on the outcome, and that was measured per chain rather than assumed. status is null when nothing could be established — on SOL, also for a signature no transaction is known by and for one not yet confirmed by the cluster. revertReason is null for a successful transaction AND for a failed one with no resolvable reason — never confuse the two, read status for outcome. On SOL the reason names the failing instruction, e.g. "Instruction 3: custom program error: 0x3".