One call that pre-flights an onchain transaction for an agent: simulates the call for reverts, checks the sender wallet's native gas balance, and reads current Base gas — returning a single GO/NO_GO verdict with reasons. Replaces 3 separate calls (simulate + balances + gas-history) every agent runs before transacting. Matches: pre-transaction check, agent transaction guard, revert + balance + gas preflight, onchain go/no-go, safe-to-send checker, autonomous trade preflight.