Community price on backpack.tf: 9.00–9.50 keys, last changed 2021-02-22 (5.6y ago). The live quote above, 11.6 keys, is 29% higher and last moved 20d 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: $24.00 — the lowest of one listing for the Terror-Watt effect when we looked on 2026-10-06 01:47 UTC (7d 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 11 keys, 36 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
63 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.
Terror-Watt Fat Man's Field Cap sell price, 2025-09-25 to 2026-10-12: 63 observations, from 9.56 keys to 7.10 keys. Sampled evenly across the range.
Observed (UTC)
Sell
Buy
25 SEP 2025 · 03:29 UTC
9.56 keys
7.44 keys
9 OCT 2025 · 09:34 UTC
9.14 keys
7.81 keys
19 OCT 2025 · 21:25 UTC
8.71 keys
7.43 keys
10 NOV 2025 · 01:42 UTC
9.56 keys
8.20 keys
8 JAN 2026 · 17:42 UTC
11.5 keys
9.07 keys
19 FEB 2026 · 10:42 UTC
11.5 keys
9.00 keys
4 MAR 2026 · 00:42 UTC
10.2 keys
8.58 keys
8 MAR 2026 · 22:43 UTC
10.1 keys
8.53 keys
26 MAR 2026 · 20:08 UTC
11.6 keys
9.28 keys
1 APR 2026 · 00:31 UTC
11.9 keys
9.56 keys
18 APR 2026 · 20:31 UTC
11.9 keys
8.31 keys
29 APR 2026 · 04:31 UTC
11.3 keys
8.39 keys
9 MAY 2026 · 00:33 UTC
11.8 keys
9.46 keys
1 JUN 2026 · 02:30 UTC
11.5 keys
9.72 keys
8 JUN 2026 · 00:32 UTC
11.3 keys
9.62 keys
22 JUN 2026 · 19:13 UTC
11.5 keys
9.97 keys
30 JUN 2026 · 19:12 UTC
7.24 keys
6.29 keys
12 JUL 2026 · 22:44 UTC
7.12 keys
6.19 keys
29 JUL 2026 · 00:45 UTC
7.92 keys
6.89 keys
3 AUG 2026 · 00:24 UTC
9.38 keys
8.17 keys
19 AUG 2026 · 12:08 UTC
10.6 keys
9.19 keys
1 SEP 2026 · 22:08 UTC
10.6 keys
9.20 keys
12 SEP 2026 · 08:10 UTC
11.2 keys
9.79 keys
15 SEP 2026 · 06:08 UTC
11.5 keys
9.95 keys
15 SEP 2026 · 08:10 UTC
11.4 keys
9.94 keys
15 SEP 2026 · 16:09 UTC
11.5 keys
9.97 keys
15 SEP 2026 · 20:09 UTC
11.5 keys
9.98 keys
16 SEP 2026 · 04:08 UTC
11.5 keys
9.96 keys
16 SEP 2026 · 16:08 UTC
11.5 keys
9.98 keys
20 SEP 2026 · 06:08 UTC
11.6 keys
10.1 keys
21 SEP 2026 · 10:11 UTC
11.6 keys
10.1 keys
21 SEP 2026 · 12:08 UTC
11.5 keys
9.97 keys
21 SEP 2026 · 20:09 UTC
11.6 keys
10.1 keys
22 SEP 2026 · 00:09 UTC
11.7 keys
10.1 keys
23 SEP 2026 · 14:10 UTC
11.6 keys
10.1 keys
7 OCT 2026 · 17:10 UTC
6.99 keys
6.08 keys
9 OCT 2026 · 05:09 UTC
7.01 keys
6.10 keys
10 OCT 2026 · 17:09 UTC
7.05 keys
6.13 keys
11 OCT 2026 · 11:09 UTC
7.06 keys
6.15 keys
12 OCT 2026 · 11:08 UTC
7.10 keys
6.18 keys
Price history in numbers
63 readings since 25 Sep 2025
Over the last 30 days the Terror-Watt Fat Man's Field Cap's sell price ranged from 6.99 keys to 11.8 keys and is down 38.3% after 26 moves. Over a year it ranged from 6.99 keys to 11.9 keys (down 18.4%). Today's 7.10 keys sits at the bottom of its range: the lowest we have recorded is 6.99 keys (7 Oct 2026) and the highest 11.9 keys (18 Apr 2026). The price has moved 62 times since we began recording it — about once every 6 days.