Cost Guard: API Budget Enforcer for AI Agents

AI agents burn through API credits fast. One broken loop can cost $50 before you notice. Cost Guard gives you per-agent and per-service budget tracking with real-time enforcement. Set daily and monthly limits for each agent, get automatic throttle warnings when spending approaches the cap, and hard-stop API calls when budgets are exceeded. Includes a SQLite cost database, budget check functions, auto-throttle model switching, daily cost reports, and cron-ready heartbeat monitoring. Works with OpenAI, Anthropic, fal.ai, and any paid API your agents call.