Every MCP metering solution I've seen requires crypto: x402 with USDC on Base, Lightning Network pre-paid API sats, Solana agent wallets. That's 3-5 steps of friction before your first paying user. nano-empire-tollbooth takes a different path: Stripe. from nano_empire_tollbooth import authorize if authorize ( request , cost_usd = 0.01 ): # serve the MCP tool call pass That's it. No wallet, no chain, no pre-paid balance. Your user hits a Stri...