Primary reply

the "MCP servers as SaaS" framing is right, but the billing layer is the thing that breaks first. most MCP tool integrations today bill the owner for all downstream agent usage — there's no native way to meter per-caller, issue refunds on failed tool calls, or enforce a spend cap before an agent runs your tool 4,000 times in a loop.

MnemoPay wires into MCP as a payment-gating layer — your tool server checks a spend envelope before executing, settles off-chain so you skip gas fees, and surfaces per-agent P&Ls in real time. 1.4K weekly npm downloads, 672+ tests: https://getbizsuite.com/mnemopay