Community price on backpack.tf: 145–150 keys, last changed 2026-02-28 (6mo ago). The live quote above, 110 keys, is 24% lower and last moved 3h 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: $339.31 — the lowest of one listing for the Massed Flies effect when we looked on 2026-08-31 01:30 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 110 keys, 5.66 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 Le Party Phantom”, with no effect in the name — the effect comes from the individual listing.
Price history
59 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 Le Party Phantom sell price, 2025-09-25 to 2026-09-05: 59 observations, from 178 keys to 110 keys. Sampled evenly across the range.
Observed (UTC)
Sell
Buy
25 SEP 2025 · 03:29 UTC
178 keys
124 keys
30 SEP 2025 · 20:24 UTC
177 keys
124 keys
19 OCT 2025 · 19:53 UTC
161 keys
124 keys
25 OCT 2025 · 16:12 UTC
153 keys
118 keys
22 FEB 2026 · 00:40 UTC
134 keys
110 keys
1 MAR 2026 · 00:41 UTC
133 keys
109 keys
23 MAR 2026 · 20:06 UTC
139 keys
84.7 keys
1 APR 2026 · 20:29 UTC
140 keys
44.8 keys
29 APR 2026 · 00:30 UTC
132 keys
72.7 keys
3 MAY 2026 · 22:30 UTC
129 keys
70.5 keys
17 MAY 2026 · 22:30 UTC
132 keys
108 keys
24 MAY 2026 · 22:30 UTC
138 keys
108 keys
9 JUN 2026 · 18:31 UTC
132 keys
109 keys
15 JUN 2026 · 00:30 UTC
126 keys
108 keys
6 JUL 2026 · 05:11 UTC
126 keys
109 keys
12 JUL 2026 · 22:44 UTC
127 keys
110 keys
31 JUL 2026 · 02:43 UTC
85.7 keys
74.4 keys
3 AUG 2026 · 00:24 UTC
94.8 keys
82.3 keys
21 AUG 2026 · 00:08 UTC
97.7 keys
85.0 keys
21 AUG 2026 · 12:08 UTC
97.4 keys
84.7 keys
22 AUG 2026 · 12:08 UTC
97.5 keys
84.8 keys
23 AUG 2026 · 00:08 UTC
97.7 keys
85.0 keys
24 AUG 2026 · 00:09 UTC
98.1 keys
85.3 keys
24 AUG 2026 · 12:09 UTC
97.6 keys
84.9 keys
25 AUG 2026 · 12:08 UTC
97.8 keys
85.1 keys
26 AUG 2026 · 00:08 UTC
97.9 keys
85.1 keys
27 AUG 2026 · 00:09 UTC
97.9 keys
85.2 keys
27 AUG 2026 · 12:08 UTC
98.0 keys
85.2 keys
28 AUG 2026 · 16:09 UTC
98.0 keys
85.2 keys
29 AUG 2026 · 04:09 UTC
98.2 keys
85.4 keys
30 AUG 2026 · 04:09 UTC
98.3 keys
85.5 keys
30 AUG 2026 · 16:07 UTC
103 keys
89.7 keys
31 AUG 2026 · 16:09 UTC
108 keys
94.2 keys
1 SEP 2026 · 04:09 UTC
108 keys
93.7 keys
2 SEP 2026 · 04:08 UTC
106 keys
92.3 keys
2 SEP 2026 · 16:08 UTC
107 keys
93.4 keys
3 SEP 2026 · 16:08 UTC
112 keys
97.0 keys
4 SEP 2026 · 04:08 UTC
109 keys
94.6 keys
5 SEP 2026 · 04:08 UTC
112 keys
97.6 keys
5 SEP 2026 · 16:08 UTC
110 keys
95.7 keys
Price history in numbers
59 readings since 25 Sep 2025
Over the last 30 days the Massed Flies Le Party Phantom's sell price ranged from 97.4 keys to 112 keys and is up 12.9% after 32 moves. Over a year it ranged from 85.7 keys to 178 keys (down 38.0%). Today's 110 keys sits in the lower third of its range: the lowest we have recorded is 85.7 keys (31 Jul 2026) and the highest 178 keys (25 Sep 2025). The price has moved 58 times since we began recording it — about once every 6 days.