The Google Analytics API is completely free for standard accounts. Google provides substantial rate limits that work for most agencies and businesses: 50,000 requests per project per day for GA4 Data API, with burst capacity up to 500 requests per second. For Universal Analytics (deprecated July 2023), the limits were 50,000 requests per day per property. These quotas handle everything from automated reporting dashboards to custom client portals without costing a cent. The catch comes when you scale beyond those limits or need enterprise features. If you exhaust your daily quota, Google throttles further requests until the reset. Companies hitting this wall typically move to Google Analytics 360, which raises quotas significantly but costs roughly $150,000 USD per year minimum. That's overkill for 99% of businesses. At Ottawa SEO Inc., we've run API integrations across 500+ domains without approaching quota limits. Our approach is batching requests intelligently and caching frequently accessed data. For example, pulling monthly organic traffic trends for 100 properties takes maybe 200 API calls if you structure dimension/metric requests properly, nowhere near the 50,000 daily cap. Practical considerations: You need a Google Cloud project to authenticate API requests, which is also free but requires setting up OAuth 2.0 credentials. The setup takes 20 minutes the first time. Rate limits apply per project, not per property, so one Cloud project can query multiple GA4 properties under the same quota umbrella. Watch out for inefficient queries. Requesting un-aggregated event data or pulling real-time metrics excessively burns through quotas fast. Stick to aggregated dimensions (landing page, source/medium, date) and you'll stay well within free tier limits. If you're building client dashboards or automating monthly reports, the free API handles it without issue. Only high-frequency, real-time analytics applications or Fortune 500 multi-brand tracking truly need 360-level quotas.