Google Cloud Platform (GCP) charges for Cloud CDN on a usage basis, not as a flat monthly license. As a multi-cloud reseller, CnCloud often sees teams underestimate cache fill and request charges when they first evaluate cdn pricing gcp. This guide breaks down the billing components, the operational variables that shift cost, and where an official Google Cloud Professional Architect review can help prevent overages.
What cdn pricing gcp includes: egress, fill, and requests
Cloud CDN billing has three main components: cache egress, cache fill, and cache lookup requests. Cache egress is billed for bytes served from Google's edge to end users; rates depend on destination region. Cache fill is billed when a request misses the cache and Cloud CDN retrieves the object from the origin. Requests are metered per 10,000 HTTP or HTTPS lookups, with HTTPS usually slightly higher. There is no separate charge for invalidations or SSL certificates.
| Billing component | What triggers it | Main cost driver |
|---|---|---|
| Cache egress | Edge response to end user | Destination region and GiB delivered |
| Cache fill | Cache miss fetched from origin | Origin location vs edge POP |
| Cache lookup requests | HTTP/HTTPS request evaluation | Request volume and protocol |
| Origin egress | Origin serves via external IP | Region and data transfer |
Operational factors that change your GCP CDN bill
When teams analyze cdn pricing gcp, the first variable to check is cache hit ratio. A lower hit ratio means a higher share of requests go to origin, increasing cache fill and origin egress. Short TTLs, cache-busting query strings, per-user cookies, or missing cache keys can all reduce the hit ratio even when traffic is stable. Destination region also matters: serving users across multiple regions can raise total cache egress compared with a single-region test.
How to lower GCP CDN costs without hurting cache hit ratio
Start with cache-friendly settings: use predictable TTLs, remove uncacheable query parameters, and separate public content from authenticated content so signed requests do not disable caching. Monitor log-based metrics for hit ratio, origin fill bytes, and egress by region. A structured cost review that combines right-sizing, architecture adjustment, and reseller-level discounts can reduce the overall cloud bill by up to about 30%—not by changing list prices, but by removing waste.
GCP Cloud CDN pricing is predictable once you understand the three metered components: cache egress, cache fill, and requests. Focus on cache hit ratio and region strategy first, then use monitoring and reseller cost reviews to keep the bill aligned with actual demand. Budgeting for Cloud CDN spend works best as an ongoing discipline, not a one-time estimate.