Community price on backpack.tf: 32.0–35.0 keys, last changed 2024-09-16 (2.0y ago). The live quote above, 26.5 keys, is 17% lower and last moved 19h 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: $115.00 — the lowest of one listing for the Massed Flies effect when we looked on 2026-08-31 01:29 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 26 keys, 31.11 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 Brotherhood of Arms”, with no effect in the name — the effect comes from the individual listing.
Price history
61 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.
Massed Flies Brotherhood of Arms sell price, 2025-09-25 to 2026-09-04: 61 observations, from 36.0 keys to 26.5 keys. Sampled evenly across the range.
Observed (UTC)
Sell
Buy
25 SEP 2025 · 03:29 UTC
36.0 keys
26.9 keys
4 OCT 2025 · 11:14 UTC
35.0 keys
21.4 keys
12 OCT 2025 · 21:29 UTC
45.3 keys
22.3 keys
30 OCT 2025 · 22:01 UTC
40.4 keys
19.6 keys
2 NOV 2025 · 14:01 UTC
41.0 keys
19.8 keys
15 NOV 2025 · 20:33 UTC
43.6 keys
21.9 keys
23 NOV 2025 · 08:36 UTC
39.3 keys
23.5 keys
8 DEC 2025 · 00:48 UTC
43.0 keys
23.9 keys
17 DEC 2025 · 06:45 UTC
44.1 keys
24.3 keys
29 DEC 2025 · 22:50 UTC
43.4 keys
24.0 keys
4 JAN 2026 · 22:51 UTC
42.7 keys
23.5 keys
22 JAN 2026 · 05:43 UTC
25.7 keys
22.0 keys
29 JAN 2026 · 01:44 UTC
36.4 keys
21.6 keys
8 FEB 2026 · 22:42 UTC
31.4 keys
20.3 keys
22 FEB 2026 · 12:40 UTC
31.5 keys
20.4 keys
1 MAR 2026 · 02:42 UTC
31.5 keys
19.8 keys
15 MAR 2026 · 22:07 UTC
21.8 keys
14.8 keys
23 MAR 2026 · 20:06 UTC
33.0 keys
16.5 keys
12 APR 2026 · 22:29 UTC
30.4 keys
18.1 keys
19 APR 2026 · 20:30 UTC
33.9 keys
19.2 keys
6 MAY 2026 · 22:31 UTC
31.7 keys
18.9 keys
10 MAY 2026 · 22:32 UTC
39.1 keys
22.0 keys
24 MAY 2026 · 16:30 UTC
27.7 keys
24.4 keys
2 JUN 2026 · 18:30 UTC
28.6 keys
24.9 keys
15 JUN 2026 · 06:29 UTC
38.3 keys
16.5 keys
22 JUN 2026 · 02:10 UTC
27.1 keys
17.4 keys
5 JUL 2026 · 23:12 UTC
22.1 keys
16.6 keys
19 JUL 2026 · 22:44 UTC
20.4 keys
17.7 keys
29 JUL 2026 · 06:44 UTC
21.4 keys
18.6 keys
12 AUG 2026 · 07:11 UTC
24.5 keys
21.3 keys
20 AUG 2026 · 16:08 UTC
23.4 keys
20.3 keys
22 AUG 2026 · 12:08 UTC
25.4 keys
22.1 keys
23 AUG 2026 · 02:09 UTC
24.4 keys
21.2 keys
26 AUG 2026 · 12:08 UTC
47.6 keys
22.5 keys
27 AUG 2026 · 04:10 UTC
47.6 keys
21.2 keys
29 AUG 2026 · 08:09 UTC
24.5 keys
21.3 keys
29 AUG 2026 · 20:09 UTC
24.6 keys
21.4 keys
31 AUG 2026 · 20:10 UTC
25.6 keys
22.3 keys
1 SEP 2026 · 08:08 UTC
26.3 keys
22.9 keys
4 SEP 2026 · 22:08 UTC
26.5 keys
23.0 keys
Price history in numbers
61 readings since 25 Sep 2025
Over the last 30 days the Massed Flies Brotherhood of Arms's sell price ranged from 23.4 keys to 47.6 keys and is up 9.1% after 16 moves. Over a year it ranged from 19.2 keys to 47.6 keys (down 26.5%). Today's 26.5 keys sits in the lower third of its range: the lowest we have recorded is 19.2 keys (11 Jul 2026) and the highest 47.6 keys (26 Aug 2026). The price has moved 60 times since we began recording it — about once every 6 days.