Community price on backpack.tf: 6.50 keys, last changed 2020-08-12 (6.1y ago). The live quote above, 6.33 keys, is 3% lower and last moved 9d 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: $16.99 — the lowest of 2 listings for the Massed Flies effect when we looked on 2026-09-03 01:39 UTC (3d 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 6 keys, 21 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 Fat Man's Field Cap”, with no effect in the name — the effect comes from the individual listing.
Price history
29 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 Fat Man's Field Cap sell price, 2025-09-25 to 2026-08-27: 29 observations, from 6.47 keys to 6.33 keys.
Observed (UTC)
Sell
Buy
25 SEP 2025 · 03:29 UTC
6.47 keys
5.22 keys
30 SEP 2025 · 21:56 UTC
6.47 keys
5.28 keys
9 OCT 2025 · 09:33 UTC
6.15 keys
5.51 keys
19 OCT 2025 · 21:25 UTC
5.87 keys
5.28 keys
25 OCT 2025 · 17:42 UTC
5.61 keys
5.06 keys
10 NOV 2025 · 01:42 UTC
6.34 keys
5.65 keys
4 DEC 2025 · 01:00 UTC
8.21 keys
6.46 keys
31 DEC 2025 · 00:56 UTC
8.00 keys
6.41 keys
4 JAN 2026 · 08:50 UTC
7.86 keys
6.30 keys
12 JAN 2026 · 01:38 UTC
7.22 keys
5.83 keys
16 JAN 2026 · 20:14 UTC
7.22 keys
5.82 keys
6 FEB 2026 · 02:23 UTC
6.89 keys
5.64 keys
8 FEB 2026 · 16:22 UTC
7.22 keys
5.90 keys
24 FEB 2026 · 00:42 UTC
6.78 keys
5.49 keys
3 MAR 2026 · 18:43 UTC
6.73 keys
5.45 keys
8 MAR 2026 · 22:43 UTC
7.07 keys
5.66 keys
1 APR 2026 · 00:31 UTC
7.20 keys
5.79 keys
25 APR 2026 · 14:32 UTC
6.77 keys
4.99 keys
10 MAY 2026 · 16:32 UTC
7.15 keys
5.67 keys
15 MAY 2026 · 14:34 UTC
7.11 keys
4.39 keys
24 MAY 2026 · 12:30 UTC
7.09 keys
5.63 keys
1 JUN 2026 · 00:30 UTC
7.17 keys
5.90 keys
10 JUN 2026 · 06:31 UTC
7.09 keys
5.83 keys
18 JUN 2026 · 12:09 UTC
7.07 keys
5.80 keys
23 JUN 2026 · 03:13 UTC
6.64 keys
5.77 keys
1 JUL 2026 · 23:12 UTC
6.60 keys
5.80 keys
4 AUG 2026 · 23:12 UTC
7.15 keys
6.21 keys
14 AUG 2026 · 09:12 UTC
6.03 keys
5.22 keys
27 AUG 2026 · 18:09 UTC
6.33 keys
5.50 keys
Price history in numbers
29 readings since 25 Sep 2025
Over the last 30 days the Massed Flies Fat Man's Field Cap's sell price ranged from 6.03 keys to 6.33 keys and is up 5.0% after 1 move. Over a year it ranged from 5.61 keys to 8.21 keys (down 2.2%). Today's 6.33 keys sits in the lower third of its range: the lowest we have recorded is 5.61 keys (25 Oct 2025) and the highest 8.21 keys (4 Dec 2025). The price has moved 26 times since we began recording it — about once every 13 days.
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