Average sale prices

Volume-weighted average sale price per item over the last 30 days, in cents, in one response with no pagination. This is the number to price a lister against: average_price is sum(price * amount) / sum(amount) across every sale of that item in the window, sales is how many separate sales made it up and volume how many copies changed hands. Thin items move on very few sales, so check sales before trusting an average. Refunded and failed orders are excluded, which is the one way this differs from GET /public/v1/sales. Optional app_id filter, worth passing since it cuts the payload to the game you trade. The whole set is built once and cached for 10 minutes; responses carry an ETag, so send it back as If-None-Match and you get a 304 when nothing has changed. generated_at is when the cached copy was built.

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