Community price on backpack.tf: 17.0 keys, last changed 2018-11-28 (7.9y ago). The live quote above, 16.8 keys, is 1% lower and last moved 12d 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: $37.69 — the lowest of 2 listings for the Massed Flies effect when we looked on 2026-10-13 01:35 UTC (6h 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 16 keys, 51.11 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 Berlin Brain Bowl”, with no effect in the name — the effect comes from the individual listing.
Price history
144 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 Berlin Brain Bowl sell price, 2025-09-25 to 2026-10-12: 144 observations, from 17.2 keys to 16.3 keys. Sampled evenly across the range.
Observed (UTC)
Sell
Buy
25 SEP 2025 · 03:29 UTC
17.2 keys
14.1 keys
29 OCT 2025 · 00:02 UTC
18.8 keys
5.14 keys
16 NOV 2025 · 14:40 UTC
29.3 keys
15.7 keys
15 DEC 2025 · 04:43 UTC
19.4 keys
14.9 keys
11 JAN 2026 · 23:35 UTC
15.0 keys
5.41 keys
5 FEB 2026 · 10:23 UTC
16.4 keys
13.0 keys
8 MAR 2026 · 22:42 UTC
15.8 keys
12.2 keys
23 APR 2026 · 16:31 UTC
16.4 keys
11.5 keys
1 JUN 2026 · 00:30 UTC
16.9 keys
12.0 keys
4 JUL 2026 · 12:01 UTC
13.9 keys
12.0 keys
10 AUG 2026 · 01:11 UTC
16.6 keys
14.5 keys
23 AUG 2026 · 22:08 UTC
15.7 keys
13.7 keys
25 AUG 2026 · 14:09 UTC
16.7 keys
14.5 keys
28 AUG 2026 · 14:10 UTC
15.6 keys
13.5 keys
29 AUG 2026 · 00:09 UTC
15.9 keys
13.9 keys
29 AUG 2026 · 16:09 UTC
16.3 keys
14.1 keys
30 AUG 2026 · 08:09 UTC
16.4 keys
14.3 keys
30 AUG 2026 · 20:10 UTC
16.7 keys
14.5 keys
2 SEP 2026 · 00:09 UTC
16.2 keys
14.1 keys
4 SEP 2026 · 10:08 UTC
16.8 keys
14.6 keys
8 SEP 2026 · 22:09 UTC
15.8 keys
13.8 keys
12 SEP 2026 · 10:08 UTC
16.4 keys
14.2 keys
20 SEP 2026 · 08:09 UTC
16.3 keys
14.1 keys
22 SEP 2026 · 12:09 UTC
15.4 keys
13.4 keys
25 SEP 2026 · 10:08 UTC
15.6 keys
13.5 keys
28 SEP 2026 · 10:08 UTC
16.4 keys
14.2 keys
29 SEP 2026 · 22:08 UTC
16.9 keys
14.7 keys
5 OCT 2026 · 07:09 UTC
15.7 keys
13.6 keys
6 OCT 2026 · 07:09 UTC
16.4 keys
14.2 keys
6 OCT 2026 · 17:09 UTC
16.3 keys
14.2 keys
7 OCT 2026 · 11:09 UTC
16.3 keys
14.2 keys
8 OCT 2026 · 09:10 UTC
16.1 keys
14.0 keys
8 OCT 2026 · 15:10 UTC
16.4 keys
14.3 keys
9 OCT 2026 · 05:09 UTC
16.6 keys
14.4 keys
9 OCT 2026 · 15:10 UTC
16.7 keys
14.5 keys
10 OCT 2026 · 01:10 UTC
16.0 keys
13.9 keys
10 OCT 2026 · 11:08 UTC
16.5 keys
14.3 keys
11 OCT 2026 · 09:10 UTC
16.1 keys
14.0 keys
11 OCT 2026 · 19:09 UTC
16.5 keys
14.3 keys
12 OCT 2026 · 11:08 UTC
16.3 keys
14.2 keys
Price history in numbers
144 readings since 25 Sep 2025
Over the last 30 days the Massed Flies Berlin Brain Bowl's sell price ranged from 12.0 keys to 16.9 keys and is up 36.4% after 64 moves. Over a year it ranged from 12.0 keys to 29.3 keys (up 4.2%). Today's 16.3 keys sits in the lower third of its range: the lowest we have recorded is 12.0 keys (14 Sep 2026) and the highest 29.3 keys (16 Nov 2025). The price has moved 143 times since we began recording it — about once every 3 days.