Agent Traffic Tollbooth

Agent Traffic Tollbooth is the practice of treating inbound AI agent requests and outbound LLM calls as metered traffic that passes through one policy layer, rather than as free background noise. Agencies need this frame because agent traffic is now a real cost center: a client's MCP server or chatbot can burn model spend and hit rate limits without a single human pageview. Placing authentication, rate limits, spend caps, and logging at a gateway turns that traffic into something you can invoice and defend. Zuplo's AI Gateway and MCP Gateway model this directly, routing LLM calls with spend caps and caching while governing agent access through one policy engine. API7 takes a comparable route with token rate limiting and LLM load balancing. The retainer logic is simple: clients pay for uptime and cost predictability, and a tollbooth gives you both numbers to report each month.