Community price on backpack.tf: 20.0–21.0 keys, last changed 2022-01-30 (4.6y ago). The live quote above, 20.9 keys, is inside the community’s range and last moved 9h 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: $53.53 — the lowest of one listing for the Kill-a-Watt effect when we looked on 2026-09-01 01:43 UTC (5d 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 20 keys, 54.22 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 Belgian Detective”, with no effect in the name — the effect comes from the individual listing.
Price history
42 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 Belgian Detective sell price, 2025-09-25 to 2026-09-05: 42 observations, from 22.7 keys to 20.9 keys. Sampled evenly across the range.
Observed (UTC)
Sell
Buy
25 SEP 2025 · 03:29 UTC
22.7 keys
16.9 keys
30 SEP 2025 · 20:55 UTC
22.7 keys
16.9 keys
9 OCT 2025 · 08:38 UTC
21.7 keys
17.7 keys
19 OCT 2025 · 20:25 UTC
20.6 keys
16.9 keys
25 OCT 2025 · 16:46 UTC
19.6 keys
16.1 keys
10 NOV 2025 · 00:47 UTC
20.9 keys
17.1 keys
30 JUN 2026 · 05:12 UTC
10.8 keys
9.38 keys
10 JUL 2026 · 12:46 UTC
7.41 keys
6.44 keys
22 JUL 2026 · 12:46 UTC
11.1 keys
9.71 keys
30 JUL 2026 · 08:45 UTC
13.2 keys
11.4 keys
10 AUG 2026 · 05:10 UTC
14.9 keys
13.0 keys
21 AUG 2026 · 02:08 UTC
15.9 keys
13.8 keys
21 AUG 2026 · 14:08 UTC
15.9 keys
13.8 keys
22 AUG 2026 · 02:08 UTC
15.9 keys
13.8 keys
22 AUG 2026 · 14:08 UTC
15.9 keys
13.8 keys
23 AUG 2026 · 02:09 UTC
15.9 keys
13.9 keys
23 AUG 2026 · 14:09 UTC
15.9 keys
13.8 keys
24 AUG 2026 · 02:09 UTC
16.0 keys
13.9 keys
24 AUG 2026 · 14:09 UTC
16.0 keys
13.9 keys
25 AUG 2026 · 02:08 UTC
16.1 keys
14.0 keys
25 AUG 2026 · 14:09 UTC
16.2 keys
14.1 keys
26 AUG 2026 · 02:09 UTC
16.2 keys
14.1 keys
26 AUG 2026 · 16:08 UTC
16.2 keys
14.1 keys
27 AUG 2026 · 04:10 UTC
16.2 keys
14.1 keys
27 AUG 2026 · 16:08 UTC
16.2 keys
14.1 keys
28 AUG 2026 · 04:09 UTC
16.4 keys
14.3 keys
28 AUG 2026 · 16:09 UTC
16.6 keys
14.4 keys
29 AUG 2026 · 04:09 UTC
16.8 keys
14.6 keys
29 AUG 2026 · 18:10 UTC
16.9 keys
14.7 keys
30 AUG 2026 · 06:09 UTC
17.1 keys
14.8 keys
31 AUG 2026 · 06:09 UTC
17.1 keys
14.8 keys
31 AUG 2026 · 18:09 UTC
17.0 keys
14.8 keys
1 SEP 2026 · 06:08 UTC
17.0 keys
14.8 keys
1 SEP 2026 · 22:08 UTC
21.1 keys
18.3 keys
2 SEP 2026 · 16:08 UTC
20.9 keys
18.1 keys
3 SEP 2026 · 06:08 UTC
20.9 keys
18.2 keys
3 SEP 2026 · 18:09 UTC
21.5 keys
18.7 keys
4 SEP 2026 · 08:08 UTC
21.6 keys
18.7 keys
4 SEP 2026 · 20:07 UTC
21.0 keys
18.2 keys
5 SEP 2026 · 08:08 UTC
20.9 keys
18.1 keys
Price history in numbers
42 readings since 25 Sep 2025
Over the last 30 days the Kill-a-Watt Belgian Detective's sell price ranged from 14.9 keys to 21.6 keys and is up 39.8% after 30 moves. Over a year it ranged from 7.41 keys to 22.7 keys (down 8.1%). Today's 20.9 keys sits in the upper third of its range: the lowest we have recorded is 7.41 keys (10 Jul 2026) and the highest 22.7 keys (25 Sep 2025). The price has moved 41 times since we began recording it — about once every 8 days.