Community price on backpack.tf: 27.0 keys, last changed 2024-08-05 (2.1y ago). The live quote above, 19.1 keys, is 29% lower and last moved 2h 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: $100.02 — the lowest of one listing for the Terror-Watt effect when we looked on 2026-09-02 01:28 UTC (4d 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 19 keys, 7.11 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 Bonk Helm”, with no effect in the name — the effect comes from the individual listing.
Price history
66 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 Bonk Helm sell price, 2025-09-25 to 2026-09-05: 66 observations, from 27.3 keys to 19.1 keys. Sampled evenly across the range.
Observed (UTC)
Sell
Buy
25 SEP 2025 · 03:29 UTC
27.3 keys
22.4 keys
9 OCT 2025 · 07:58 UTC
26.1 keys
23.5 keys
19 OCT 2025 · 19:44 UTC
24.9 keys
22.4 keys
10 NOV 2025 · 00:02 UTC
25.1 keys
22.5 keys
24 NOV 2025 · 18:33 UTC
28.0 keys
18.6 keys
3 DEC 2025 · 14:50 UTC
28.0 keys
18.6 keys
23 DEC 2025 · 15:07 UTC
29.2 keys
19.9 keys
4 JAN 2026 · 22:49 UTC
27.0 keys
19.3 keys
11 JAN 2026 · 23:31 UTC
24.8 keys
18.5 keys
3 FEB 2026 · 18:21 UTC
23.7 keys
18.1 keys
15 FEB 2026 · 22:39 UTC
23.9 keys
19.2 keys
25 FEB 2026 · 02:40 UTC
22.5 keys
18.2 keys
8 MAR 2026 · 16:41 UTC
22.1 keys
17.9 keys
22 MAR 2026 · 20:06 UTC
23.3 keys
19.1 keys
1 APR 2026 · 00:29 UTC
23.9 keys
17.8 keys
23 APR 2026 · 08:30 UTC
24.0 keys
18.5 keys
2 MAY 2026 · 20:30 UTC
22.0 keys
17.4 keys
10 MAY 2026 · 12:29 UTC
21.8 keys
18.5 keys
24 MAY 2026 · 16:29 UTC
21.0 keys
18.3 keys
8 JUN 2026 · 00:30 UTC
20.4 keys
17.0 keys
15 JUN 2026 · 00:30 UTC
20.0 keys
18.3 keys
30 JUN 2026 · 05:12 UTC
23.2 keys
20.2 keys
12 JUL 2026 · 18:45 UTC
23.1 keys
20.1 keys
19 JUL 2026 · 16:44 UTC
23.3 keys
20.2 keys
5 AUG 2026 · 09:12 UTC
15.4 keys
13.4 keys
21 AUG 2026 · 10:08 UTC
15.9 keys
13.9 keys
21 AUG 2026 · 22:08 UTC
15.9 keys
13.8 keys
22 AUG 2026 · 22:08 UTC
15.9 keys
13.9 keys
24 AUG 2026 · 20:09 UTC
16.0 keys
13.9 keys
25 AUG 2026 · 08:08 UTC
16.0 keys
13.9 keys
26 AUG 2026 · 08:08 UTC
16.0 keys
13.9 keys
27 AUG 2026 · 08:08 UTC
16.0 keys
13.9 keys
27 AUG 2026 · 22:09 UTC
16.0 keys
13.9 keys
28 AUG 2026 · 22:09 UTC
16.0 keys
13.9 keys
1 SEP 2026 · 00:08 UTC
16.7 keys
14.5 keys
1 SEP 2026 · 20:08 UTC
17.0 keys
14.7 keys
3 SEP 2026 · 02:08 UTC
17.6 keys
15.3 keys
5 SEP 2026 · 04:08 UTC
19.1 keys
16.6 keys
5 SEP 2026 · 08:07 UTC
18.6 keys
16.2 keys
5 SEP 2026 · 16:08 UTC
19.1 keys
16.6 keys
Price history in numbers
66 readings since 25 Sep 2025
Over the last 30 days the Terror-Watt Bonk Helm's sell price ranged from 15.7 keys to 19.1 keys and is up 21.8% after 24 moves. Over a year it ranged from 15.4 keys to 29.2 keys (down 30.1%). Today's 19.1 keys sits in the lower third of its range: the lowest we have recorded is 15.4 keys (5 Aug 2026) and the highest 29.2 keys (23 Dec 2025). The price has moved 63 times since we began recording it — about once every 5 days.