A CDN invoice is one page long and most people never read past the total. That page is also where the entire negotiation lives. Here is how we read one, and what each line is quietly telling you.
Start with the effective rate, not the list rate
Divide the total delivery charge by the gigabytes delivered. That number, your effective per-GB rate, is the only price that matters, and it is almost never the rate printed in your contract. Discount tiers, regional blending and minimums all push it around. If you don’t know your effective rate to three decimal places, you don’t know what you’re paying.
Find the commitment, and the gap
Most enterprise CDN contracts carry a monthly commitment: you pay for a volume whether you use it or not. The interesting number is the gap between commitment and actual usage. Paying for 500 TB and shipping 320 TB means your real effective rate is 56% higher than you think. A persistent gap is the single strongest renegotiation card you hold.
Separate bandwidth from requests
Some providers bill per GB only; others add a per-request fee. For image-heavy or API-heavy traffic, millions of small objects, request fees can quietly rival the bandwidth line. If your invoice has both lines, work out what percentage requests represent. Above roughly 15%, your traffic profile is mismatched to your rate structure, and there is usually a better-shaped deal elsewhere.
Check the regional blend
“Global” rates blend cheap regions with expensive ones. If 80% of your audience is in Europe and North America, a blended global rate means you are subsidizing delivery you don’t use. Regional line items, or a provider priced regionally, routinely save double digits for concentrated audiences.
Look at the date, not just the numbers
The most valuable field on the invoice is the contract renewal date. Market rates fall over time; committed contracts don’t. Every quarter that passes between market and contract widens the spread, and the ninety days before renewal is when all of your leverage exists. Put the date in your calendar with a six-month reminder.
What we do with an invoice
When a client sends us an invoice, we benchmark every line against our index: the effective rate against current market rates for that volume and mix, the commitment against actual usage, the structure against the traffic profile. The output is a one-page answer: what you should be paying, and the three numbers to open the negotiation with.
Send us the invoice. We’ll do this for you.
One page from you, one page back from us: what you should be paying, and the numbers to negotiate with. Free, and yours to keep.