Select the volume charge model if you want to define several price tiers but want to apply a single unit price based on the total volume. You can also apply a flat fee in addition to the unit price.

Consider the following example, where each unit represents an API call:

TierFirst unitLast unitUnit priceFixed fee
Tier 1010,000$0.0010$10
Tier 210,00150,000$0.0008$10
Tier 350,001100,000$0.0006$10
Tier 4100,001$0.0004$10

In this case, 65,000 API calls would cost 65,000 x $0.0006 + $10 = $49.