Community price on backpack.tf: 14.0 keys, last changed 2025-12-17 (10mo ago). The live quote above, 16.1 keys, is 15% higher and last moved 16d 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: $38.18 — the lowest of one listing for the Kill-a-Watt effect when we looked on 2026-10-07 01:48 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 16 keys, 6.55 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 Head of Defense”, with no effect in the name — the effect comes from the individual listing.
Price history
91 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.
Kill-a-Watt Head of Defense sell price, 2025-12-20 to 2026-10-12: 91 observations, from 12.6 keys to 16.1 keys. Sampled evenly across the range.
Observed (UTC)
Sell
Buy
20 DEC 2025 · 18:06 UTC
12.6 keys
11.3 keys
29 JUN 2026 · 01:14 UTC
11.7 keys
10.1 keys
29 JUL 2026 · 02:45 UTC
12.8 keys
11.1 keys
10 AUG 2026 · 17:11 UTC
13.3 keys
11.6 keys
21 AUG 2026 · 12:08 UTC
12.2 keys
10.6 keys
24 AUG 2026 · 02:09 UTC
12.4 keys
10.8 keys
25 AUG 2026 · 02:09 UTC
12.7 keys
11.0 keys
26 AUG 2026 · 10:09 UTC
11.4 keys
9.91 keys
28 AUG 2026 · 00:09 UTC
12.5 keys
10.9 keys
28 AUG 2026 · 12:07 UTC
12.7 keys
11.1 keys
28 AUG 2026 · 16:09 UTC
12.7 keys
11.1 keys
29 AUG 2026 · 00:09 UTC
12.8 keys
11.1 keys
30 AUG 2026 · 12:09 UTC
13.2 keys
11.5 keys
31 AUG 2026 · 12:09 UTC
13.0 keys
11.3 keys
1 SEP 2026 · 22:08 UTC
12.4 keys
10.8 keys
2 SEP 2026 · 10:08 UTC
12.2 keys
10.6 keys
2 SEP 2026 · 16:09 UTC
12.3 keys
10.7 keys
3 SEP 2026 · 00:08 UTC
12.4 keys
10.8 keys
3 SEP 2026 · 10:09 UTC
12.4 keys
10.8 keys
4 SEP 2026 · 00:08 UTC
12.6 keys
10.9 keys
5 SEP 2026 · 02:08 UTC
13.2 keys
11.5 keys
6 SEP 2026 · 08:09 UTC
13.4 keys
11.6 keys
7 SEP 2026 · 20:09 UTC
13.5 keys
11.7 keys
9 SEP 2026 · 08:09 UTC
13.9 keys
12.1 keys
10 SEP 2026 · 20:09 UTC
14.2 keys
12.3 keys
12 SEP 2026 · 08:10 UTC
14.5 keys
12.6 keys
13 SEP 2026 · 08:09 UTC
14.7 keys
12.8 keys
14 SEP 2026 · 08:08 UTC
15.0 keys
13.1 keys
15 SEP 2026 · 20:09 UTC
15.4 keys
13.4 keys
17 SEP 2026 · 08:09 UTC
15.8 keys
13.8 keys
18 SEP 2026 · 08:08 UTC
16.0 keys
13.9 keys
20 SEP 2026 · 00:09 UTC
16.2 keys
14.1 keys
23 SEP 2026 · 04:09 UTC
16.3 keys
14.1 keys
24 SEP 2026 · 04:09 UTC
16.4 keys
14.3 keys
25 SEP 2026 · 06:08 UTC
16.3 keys
14.2 keys
26 SEP 2026 · 02:08 UTC
16.3 keys
14.2 keys
26 SEP 2026 · 12:08 UTC
16.4 keys
14.2 keys
5 OCT 2026 · 15:09 UTC
15.2 keys
13.2 keys
8 OCT 2026 · 01:10 UTC
16.1 keys
14.0 keys
12 OCT 2026 · 19:08 UTC
16.1 keys
14.0 keys
Price history in numbers
91 readings since 20 Dec 2025
Over the last 30 days the Kill-a-Watt Head of Defense's sell price ranged from 14.7 keys to 16.4 keys and is up 9.1% after 30 moves. Over a year it ranged from 11.3 keys to 16.4 keys (up 27.6%). Today's 16.1 keys sits in the upper third of its range: the lowest we have recorded is 11.3 keys (8 Jul 2026) and the highest 16.4 keys (24 Sep 2026). The price has moved 90 times since we began recording it — about once every 3 days.