paysentry launched this week as an open-source control plane for ai agent payments. it's the third governance-layer tool to ship this month, after ledge and agentkey. the timing isn't random. agents are moving from demos to production, and production means real money moving without human approval on every transaction. that requires a control plane — something that sits between the agent and the payment rail, enforces policy, and logs decisions. paysentry, ledge, and mnemopay's fiscalgate all solve the same core problem: an agent wants to pay someone, and something has to decide whether that payment should happen before it clears. the control plane checks budget (is there money left), policy (is this vendor approved), and context (did the agent already pay this invoice). if all checks pass, the payment proceeds. if any check fails, the payment blocks and the failure gets logged.…