Community price on backpack.tf: 275 keys, last changed 2026-02-05 (7mo ago). The live quote above, 189 keys, is 31% lower and last moved 6h 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.
Price history
12 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.
Sulphurous Engineer's Cap sell price, 2025-09-25 to 2026-09-05: 12 observations, from 39.5 keys to 189 keys.
Observed (UTC)
Sell
Buy
25 SEP 2025 · 03:29 UTC
39.5 keys
32.4 keys
30 SEP 2025 · 20:09 UTC
39.5 keys
32.3 keys
9 OCT 2025 · 07:54 UTC
37.8 keys
34.0 keys
19 OCT 2025 · 19:39 UTC
35.9 keys
32.3 keys
25 OCT 2025 · 15:57 UTC
34.2 keys
30.8 keys
9 NOV 2025 · 23:57 UTC
36.2 keys
32.6 keys
17 NOV 2025 · 04:31 UTC
13.0 keys
13.0 keys
28 JUL 2026 · 06:44 UTC
11.7 keys
10.3 keys
19 AUG 2026 · 08:32 UTC
166 keys
145 keys
23 AUG 2026 · 14:08 UTC
171 keys
149 keys
24 AUG 2026 · 02:09 UTC
181 keys
157 keys
5 SEP 2026 · 14:08 UTC
189 keys
164 keys
Price history in numbers
12 readings since 25 Sep 2025
Over the last 30 days the Sulphurous Engineer's Cap's sell price ranged from 166 keys to 189 keys and is up 13.6% after 3 moves. Over a year it ranged from 11.7 keys to 189 keys (up 378.2%). Today's 189 keys sits at the top of its range: the lowest we have recorded is 11.7 keys (28 Jul 2026) and the highest 189 keys (5 Sep 2026). The price has moved 11 times since we began recording it — about once every 31 days.
Collector's Kritzkrieg