Use when an agent must confirm a Solana payment or transaction landed: did it succeed, who paid whom, how much of which token. Input: signature. Output: JSON status (success/failed), slot, block time, confirmation status, fee payer, signers, fee, programs, SOL and token balance changes per account (first 25). Unknown signature: 404, not charged. Example: ?signature=5Xg1wCobkM4jAJNHE6t7B1amt4ch5wq5GrxuhQXXgoAkUPUAjVMC9tQFCvp1awUGfrqZY9L9sLdPieJ97DcDjXtC