# Buyer's premium

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**Buyer's premium:** A percentage an auction house adds to the winning bid, paid by the buyer.

## How we measure it

We record the rate from the venue's fee page, and from the lot's own notice when it prints one.

## What it is not

A hammer price without the premium understates what the buyer paid.

## Where it appears in the data

Field names as the API returns them; each dataset's page in the API lists the field's type and unit.

- `fee_kind` in dataset `collectibles_fees`
- `premium_notice_pct` in dataset `comicconnect_results`

## Related

- [Marketplace and auction fees: how we read them](/methodology/fee-schedules/)
- [All glossary terms](/glossary/)