Holdify is a Revenue Firewall for AI-first SaaS. It connects your billing (Stripe or Polar) to your API and LLM gateway so access and spend follow each customer’s plan in real time. Set per-tenant budgets, rate limits, and model allowlists. Enforce hard caps, auto-downgrade models, or block on overage. Detect abuse and anomalies. Sync entitlements automatically, no custom webhook glue.