Community price on backpack.tf: 17.0 keys, last changed 2025-07-29 (1.1y ago). The live quote above, 17.4 keys, is 2% higher and last moved 17h 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: $59.49 — the lowest of one listing for the Kill-a-Watt effect when we looked on 2026-09-03 01:22 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 17 keys, 22.55 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 Human Cannonball”, with no effect in the name — the effect comes from the individual listing.
Price history
51 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 Human Cannonball sell price, 2025-09-25 to 2026-09-05: 51 observations, from 17.5 keys to 17.4 keys. Sampled evenly across the range.
Observed (UTC)
Sell
Buy
25 SEP 2025 · 03:29 UTC
17.5 keys
14.3 keys
30 SEP 2025 · 20:08 UTC
17.5 keys
14.3 keys
19 OCT 2025 · 19:38 UTC
15.9 keys
14.3 keys
25 OCT 2025 · 15:55 UTC
15.1 keys
13.6 keys
9 NOV 2025 · 23:55 UTC
16.0 keys
14.4 keys
17 NOV 2025 · 00:31 UTC
17.6 keys
13.1 keys
22 DEC 2025 · 23:06 UTC
16.8 keys
14.1 keys
29 DEC 2025 · 22:47 UTC
16.2 keys
9.35 keys
4 JAN 2026 · 22:49 UTC
15.7 keys
11.9 keys
22 JAN 2026 · 05:43 UTC
13.9 keys
12.2 keys
1 FEB 2026 · 09:42 UTC
13.1 keys
11.6 keys
9 FEB 2026 · 06:40 UTC
13.7 keys
12.2 keys
26 FEB 2026 · 16:40 UTC
13.4 keys
11.9 keys
29 JUN 2026 · 15:12 UTC
11.3 keys
9.87 keys
7 JUL 2026 · 01:11 UTC
10.9 keys
9.47 keys
12 JUL 2026 · 22:44 UTC
11.9 keys
10.3 keys
29 JUL 2026 · 04:46 UTC
12.7 keys
11.1 keys
3 AUG 2026 · 15:12 UTC
8.32 keys
7.24 keys
10 AUG 2026 · 13:10 UTC
14.0 keys
12.2 keys
21 AUG 2026 · 00:08 UTC
13.9 keys
12.1 keys
22 AUG 2026 · 02:08 UTC
13.9 keys
12.1 keys
22 AUG 2026 · 14:08 UTC
13.9 keys
12.1 keys
23 AUG 2026 · 02:08 UTC
14.0 keys
12.2 keys
23 AUG 2026 · 14:08 UTC
14.0 keys
12.2 keys
24 AUG 2026 · 16:08 UTC
14.1 keys
12.3 keys
25 AUG 2026 · 04:09 UTC
14.2 keys
12.4 keys
25 AUG 2026 · 20:09 UTC
14.4 keys
12.5 keys
27 AUG 2026 · 16:08 UTC
14.5 keys
12.6 keys
28 AUG 2026 · 09:36 UTC
14.8 keys
12.9 keys
28 AUG 2026 · 20:09 UTC
15.0 keys
13.0 keys
29 AUG 2026 · 14:09 UTC
15.0 keys
13.1 keys
30 AUG 2026 · 18:09 UTC
15.1 keys
13.1 keys
31 AUG 2026 · 06:09 UTC
16.3 keys
14.2 keys
31 AUG 2026 · 18:09 UTC
15.1 keys
13.1 keys
1 SEP 2026 · 18:08 UTC
17.0 keys
14.8 keys
2 SEP 2026 · 06:08 UTC
16.8 keys
14.6 keys
2 SEP 2026 · 18:08 UTC
17.0 keys
14.8 keys
3 SEP 2026 · 06:08 UTC
17.1 keys
14.8 keys
4 SEP 2026 · 12:08 UTC
17.3 keys
15.1 keys
5 SEP 2026 · 00:07 UTC
17.4 keys
15.1 keys
Price history in numbers
51 readings since 25 Sep 2025
Over the last 30 days the Kill-a-Watt Human Cannonball's sell price ranged from 13.9 keys to 17.5 keys and is up 23.9% after 27 moves. Over a year it ranged from 8.32 keys to 17.9 keys (down 0.6%). Today's 17.4 keys sits in the upper third of its range: the lowest we have recorded is 8.32 keys (3 Aug 2026) and the highest 17.9 keys (13 Dec 2025). The price has moved 50 times since we began recording it — about once every 7 days.