Webhook Guardian: AI Agent That Stops Your Open Webhooks from Draining Your Wallet

The poster warns that many n8n tutorials show how to create open webhooks connected to GPT or external APIs without addressing security, which leaves non-developers exposed to abuse and potentially large costs such as around $600 per 1M GPT-4.1 requests; they ask how others secure webhooks in n8n and whether people rely on obscurity or implement auth rate limits validation and other protections.