Stack math
What $/mo buys across seats and list-rate API, with receipts.
Seats
Count the seats whose price is printed on the card. Vendor receipts are linked; totals are arithmetic.
Claude
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API at list
Add model lines at public list rates. Dollars are input MTok × input $/MTok plus output MTok × output $/MTok.
No API lines. Add one to price list-rate volume.
Total
Seats subtotal$0
API subtotal$0
Known monthly dollars$0
Seats carry vendor receipts; API is list-rate arithmetic on your volume, not a usage measurement.