Skinport sales statistics: median, average and volume

01

Start with a completed-sale data window

Skinport’s public sales-history documentation provides minimum, maximum, average, median and volume for 24 hours, seven days, thirty days and ninety days. These are completed-sale aggregates, not an order guaranteeing a new buyer.

Save the item’s complete market name, any version, currency, chosen window and capture time. A thirty-day statistic is incomplete if it is later compared with a seven-day number without saying so.

02

Use the statistic that answers your question

The average adds values and divides by their count; the median is the middle ordered observation. A high outlier can move the average more than the median. Both still describe that sample, which may mix individual skins with different attributes.

For invented sales of 10, 10, 11, 12 and 57 units, the average is 20 and the median is 11. Reporting only 20 would hide how unusual the final observation is.

03

Treat null and zero volume correctly

The official example pairs zero sales volume in an empty window with null price statistics. That does not mean the skin sold for zero. Preserve missingness when writing a spreadsheet or comparison.

If a longer window contains sales while the last day has none, report both facts. Carrying the old median forward without labelling its age makes sparse data look current.

04

Do not add overlapping period volumes

Twenty-four hours is part of seven days, which is part of thirty days. Adding those reported volumes double counts observations. Choose a single window for a count comparison or calculate non-overlapping intervals only when the data supports that operation.

For an invented seven-day count of 70 and thirty-day count of 100, the total is not 170. The thirty-day window already contains the week. That is a data-reading rule, not a statement about any actual item’s demand.

05

Keep aggregation and freshness limits visible

The endpoint is documented as cached for five minutes. Record when the data was retrieved, and do not interpret repeated identical responses inside that period as proof no trades occurred.

A grouped median does not settle an exact craft or pattern premium. Retain appropriate item-level evidence and the actual final quote for any transaction; public statistical access requires no account sign-in.

BEFORE YOU CONTINUE

Quick checklist

• Keep item, version, currency and window together.
• Read median, average and volume separately.
• Preserve null as missing rather than zero.
• Do not sum overlapping periods.