Community price on backpack.tf: 49.0–56.0 keys, last changed 2026-09-03 (1mo ago). The live quote above, 58.0 keys, is 18% higher and last moved 12d ago. They are different measures: the quote is what traders and bots are asking and bidding on the classifieds right now, and it moves for thousands of items every day; the community price is a suggestion accepted by vote, which changes only when someone argues it should. A quote well away from the vote is usually a price that is about to be re-argued. Community prices from backpack.tf, read under an hour ago.
Steam Market asking price: $282.18 — the lowest of one listing for the Massed Flies effect when we looked on 2026-10-07 01:34 UTC (6d ago). This is what a seller is asking, not what anything sold for. Steam pays out in Steam wallet funds, not cash, and Valve takes roughly 15% at the till — so asking prices there run well above the 57 keys, 62.55 ref shown above, which comes from the keys-and-metal market on backpack.tf. The two are different markets and are never blended. Steam lists the item as “Unusual Prehistoric Pullover”, with no effect in the name — the effect comes from the individual listing.
Price history
173 observations
Interactive chart. Press the left and right arrow keys to move along the series, Home or End to jump to either end, Escape to clear.
The key axis converts at today's rate. Prices are recorded in metal, so a line that is flat in keys followed the key rate rather than standing still.
Massed Flies Prehistoric Pullover sell price, 2025-09-25 to 2026-10-13: 173 observations, from 47.5 keys to 56.9 keys. Sampled evenly across the range.
Observed (UTC)
Sell
Buy
25 SEP 2025 · 03:29 UTC
47.5 keys
38.9 keys
25 OCT 2025 · 17:19 UTC
41.1 keys
37.0 keys
15 FEB 2026 · 04:41 UTC
51.8 keys
36.6 keys
15 MAR 2026 · 18:08 UTC
47.1 keys
27.6 keys
29 APR 2026 · 04:31 UTC
48.1 keys
24.1 keys
1 JUN 2026 · 08:31 UTC
51.3 keys
40.7 keys
29 JUN 2026 · 01:14 UTC
45.5 keys
39.6 keys
3 AUG 2026 · 15:12 UTC
38.8 keys
33.7 keys
22 AUG 2026 · 10:09 UTC
44.2 keys
38.4 keys
23 AUG 2026 · 02:09 UTC
45.6 keys
39.7 keys
26 AUG 2026 · 06:09 UTC
45.6 keys
39.7 keys
26 AUG 2026 · 18:08 UTC
45.8 keys
39.8 keys
27 AUG 2026 · 06:09 UTC
46.0 keys
40.0 keys
27 AUG 2026 · 16:08 UTC
46.2 keys
40.1 keys
29 AUG 2026 · 12:09 UTC
47.0 keys
40.9 keys
31 AUG 2026 · 12:09 UTC
47.8 keys
41.6 keys
3 SEP 2026 · 00:08 UTC
47.7 keys
41.5 keys
5 SEP 2026 · 06:08 UTC
48.1 keys
41.9 keys
7 SEP 2026 · 14:08 UTC
50.6 keys
44.0 keys
10 SEP 2026 · 12:08 UTC
50.3 keys
43.8 keys
12 SEP 2026 · 12:08 UTC
51.0 keys
44.4 keys
15 SEP 2026 · 00:08 UTC
52.4 keys
45.6 keys
17 SEP 2026 · 12:08 UTC
57.4 keys
49.9 keys
23 SEP 2026 · 12:07 UTC
57.5 keys
50.0 keys
24 SEP 2026 · 04:08 UTC
58.7 keys
51.1 keys
25 SEP 2026 · 00:08 UTC
58.5 keys
50.9 keys
25 SEP 2026 · 20:09 UTC
58.8 keys
51.1 keys
27 SEP 2026 · 14:08 UTC
59.2 keys
51.5 keys
29 SEP 2026 · 02:08 UTC
57.8 keys
50.3 keys
30 SEP 2026 · 12:08 UTC
57.9 keys
50.3 keys
5 OCT 2026 · 15:09 UTC
58.1 keys
50.5 keys
6 OCT 2026 · 07:09 UTC
58.4 keys
50.8 keys
6 OCT 2026 · 21:09 UTC
58.7 keys
51.0 keys
7 OCT 2026 · 15:10 UTC
58.9 keys
51.2 keys
8 OCT 2026 · 17:10 UTC
57.3 keys
49.8 keys
9 OCT 2026 · 07:09 UTC
57.7 keys
50.2 keys
9 OCT 2026 · 21:10 UTC
58.7 keys
51.1 keys
10 OCT 2026 · 09:09 UTC
58.8 keys
51.1 keys
10 OCT 2026 · 23:09 UTC
58.9 keys
51.2 keys
13 OCT 2026 · 03:08 UTC
56.9 keys
49.5 keys
Price history in numbers
173 readings since 25 Sep 2025
Over the last 30 days the Massed Flies Prehistoric Pullover's sell price ranged from 50.9 keys to 59.2 keys and is up 11.6% after 82 moves. Over a year it ranged from 38.8 keys to 59.2 keys (up 32.0%). Today's 56.9 keys sits in the upper third of its range: the lowest we have recorded is 38.8 keys (3 Aug 2026) and the highest 59.2 keys (27 Sep 2026). The price has moved 171 times since we began recording it — about once every 2 days.