This price has not changed since 2026-09-21 10:10 UTC. It reflects the last observed trade rather than current market value, and this page is excluded from our sitemap for that reason.
Community price on backpack.tf: 175–180 keys, last changed 2024-02-22 (2.7y ago). The live quote above, 163 keys, is 7% lower and last moved 1mo 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: $617.95 — the lowest of one listing for the Massed Flies effect when we looked on 2026-11-03 01:28 UTC (2d 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 162 keys, 52.11 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 Mining Light”, with no effect in the name — the effect comes from the individual listing.
Price history
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.
| Observed (UTC) | Sell | Buy |
|---|---|---|
| 25 SEP 2025 · 03:29 UTC | 180 keys | 143 keys |
| 30 SEP 2025 · 20:16 UTC | 181 keys | 143 keys |
| 9 OCT 2025 · 08:00 UTC | 173 keys | 151 keys |
| 19 OCT 2025 · 19:46 UTC | 165 keys | 143 keys |
| 10 NOV 2025 · 00:04 UTC | 166 keys | 144 keys |
| 21 NOV 2025 · 04:30 UTC | 384 keys | 384 keys |
| 16 APR 2026 · 22:29 UTC | 160 keys | 99.1 keys |
| 22 JUN 2026 · 21:13 UTC | 107 keys | 92.9 keys |
| 29 JUN 2026 · 01:14 UTC | 124 keys | 108 keys |
| 5 JUL 2026 · 23:12 UTC | 118 keys | 103 keys |
| 19 JUL 2026 · 22:44 UTC | 125 keys | 109 keys |
| 29 JUL 2026 · 08:45 UTC | 131 keys | 114 keys |
| 3 AUG 2026 · 00:24 UTC | 136 keys | 118 keys |
| 10 AUG 2026 · 05:10 UTC | 142 keys | 124 keys |
| 20 AUG 2026 · 10:10 UTC | 115 keys | 100 keys |
| 23 AUG 2026 · 06:09 UTC | 125 keys | 109 keys |
| 24 AUG 2026 · 08:08 UTC | 125 keys | 108 keys |
| 3 SEP 2026 · 10:08 UTC | 112 keys | 97.1 keys |
| 4 SEP 2026 · 04:08 UTC | 122 keys | 106 keys |
| 4 SEP 2026 · 18:08 UTC | 112 keys | 97.0 keys |
| 5 SEP 2026 · 16:08 UTC | 127 keys | 111 keys |
| 5 SEP 2026 · 20:08 UTC | 127 keys | 110 keys |
| 6 SEP 2026 · 00:09 UTC | 128 keys | 111 keys |
| 6 SEP 2026 · 18:08 UTC | 136 keys | 118 keys |
| 10 SEP 2026 · 14:07 UTC | 140 keys | 122 keys |
| 12 SEP 2026 · 00:09 UTC | 142 keys | 123 keys |
| 12 SEP 2026 · 12:08 UTC | 144 keys | 125 keys |
| 13 SEP 2026 · 12:08 UTC | 158 keys | 137 keys |
| 14 SEP 2026 · 06:08 UTC | 159 keys | 138 keys |
| 15 SEP 2026 · 00:08 UTC | 159 keys | 139 keys |
| 16 SEP 2026 · 08:08 UTC | 160 keys | 139 keys |
| 17 SEP 2026 · 06:08 UTC | 160 keys | 139 keys |
| 17 SEP 2026 · 18:08 UTC | 162 keys | 141 keys |
| 20 SEP 2026 · 08:08 UTC | 162 keys | 141 keys |
| 21 SEP 2026 · 10:10 UTC | 163 keys | 142 keys |
| 8 OCT 2026 · 01:09 UTC | 120 keys | 104 keys |
| 17 OCT 2026 · 15:07 UTC | 106 keys | 92.3 keys |
| 18 OCT 2026 · 03:08 UTC | 107 keys | 93.1 keys |
| 26 OCT 2026 · 05:11 UTC | 107 keys | 99.6 keys |
| 26 OCT 2026 · 19:12 UTC | 106 keys | 106 keys |
Price history in numbers
46 readings since 25 Sep 2025Over the last 30 days the Massed Flies Mining Light's sell price ranged from 106 keys to 120 keys and is down 11.2% after 5 moves. Over a year it ranged from 106 keys to 384 keys (down 35.9%). Today's 106 keys sits at the bottom of its range: the lowest we have recorded is 106 keys (17 Oct 2026) and the highest 384 keys (21 Nov 2025). The price has moved 45 times since we began recording it — about once every 9 days.
| Window | Low | High | Change | Moves | Readings |
|---|---|---|---|---|---|
| 30 days | 106 keys | 120 keys | −11.2% | 5 | 6 |
| 90 days | 106 keys | 163 keys | −25.2% | 30 | 31 |
| a year | 106 keys | 384 keys | −35.9% | 40 | 41 |
Details
| SKU | 48;5;u12 |
|---|---|
| Last price change | 2026-09-21 10:10 UTC |
| Key rate when recorded | 63.89 ref |
Same effect, other items
the effect across the catalogue| Item | Value | Updated |
|---|---|---|
| 1,200 keys | 12mo ago | |
| 600 keys | 12mo ago | |
| 581 keys | 12mo ago | |
| 500 keys | 12mo ago | |
| 481 keys | 12mo ago | |
| 470 keys | 12mo ago | |
| 325 keys | 12mo ago | |
| 321 keys | 1mo ago | |
| 309 keys | 1mo ago | |
| 236 keys | 2mo ago |
Other effects on the Mining Light
same item, different effect| Item | Value | Updated |
|---|---|---|
| 1,228 keys | 3mo ago | |
| 578 keys | 1mo ago | |
| 348 keys | 1mo ago | |
| 335 keys | 10mo ago | |
| 249 keys | 10mo ago | |
| 230 keys | 1mo ago | |
| 205 keys | 1mo ago | |
| 194 keys | 1mo ago | |
| 189 keys | 1mo ago | |
| 183 keys | 1mo ago |
Priced similarly
across the catalogue| Item | Value | Updated |
|---|---|---|
| 164 keys | 2mo ago | |
| 162 keys | 4mo ago | |
| 162 keys | 4mo ago | |
| 165 keys | 1mo ago | |
| 164 keys | 1mo ago | |
| 168 keys | 1mo ago | |
| 161 keys | 1mo ago | |
| 168 keys | 1mo ago |