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CPS (Calls Per Second) is the maximum number of new call attempts your account can start in a single second - the top speed of your outbound dialling engine. It caps how fast calls go out, not how many can be live at once; that second limit is Concurrency.
URL
Open it from Capacity → CPS in the left sidebar.
CPS page with a Purchase CPS card showing a quantity stepper in blocks of three, an estimated monthly cost, a pricing bracket table with units, price per unit and subtotal, and a Buy CPS button, beside a What is CPS explainer card describing call-initiation throughput and when to increase it

CPS - purchase panel and explainer

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When to raise CPS

High-volume broadcast and auto-dial campaigns saturate the default CPS ceiling first. Raising it removes the throttle so a run launches thousands of calls in seconds rather than minutes. The symptom of a CPS ceiling is a campaign that completes correctly but slowly - attempts trickle out at a steady rate no matter how much concurrency is free. If instead callers hit busy signals, concurrency is the limit, not CPS.

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Buying capacity

Capacity is purchased in blocks of 3 and billed monthly. The first month is charged on purchase, and the subscription then renews on its own cycle until you cancel it from My Subscriptions.
The prices in the screenshot belong to one account’s pricing tier. Your own rate appears in the bracket table as you change the quantity, and Preview capacity pricing returns the same figure over the API without charging anything.

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Buy it over the API

Preview capacity pricing

Calculate the monthly price for a CPS quantity without creating a subscription.

Purchase capacity

Create the subscription with resource_type: "cps" and a quantity.