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Contagious Eruption Undercover Brolly
Community price on backpack.tf: 9.00–13.0 keys, last changed 2023-08-18 (3.1y ago). The live quote above, 10.8 keys, is inside the community’s range and last moved 22h 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: $42.67 — the lowest of one listing for the Contagious Eruption effect when we looked on 2026-09-04 01:41 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 10 keys, 46.88 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 Undercover Brolly”, 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 | 13.3 keys | 7.56 keys |
| 9 OCT 2025 · 10:22 UTC | 13.7 keys | 7.93 keys |
| 19 OCT 2025 · 22:18 UTC | 13.1 keys | 7.55 keys |
| 2 NOV 2025 · 06:13 UTC | 13.7 keys | 6.24 keys |
| 16 NOV 2025 · 22:43 UTC | 15.7 keys | 8.27 keys |
| 23 NOV 2025 · 20:57 UTC | 15.2 keys | 9.36 keys |
| 10 DEC 2025 · 23:04 UTC | 15.5 keys | 8.68 keys |
| 22 DEC 2025 · 01:14 UTC | 13.7 keys | 8.74 keys |
| 29 DEC 2025 · 02:58 UTC | 15.1 keys | 8.71 keys |
| 11 JAN 2026 · 23:39 UTC | 13.2 keys | 8.31 keys |
| 29 JAN 2026 · 01:46 UTC | 12.3 keys | 8.83 keys |
| 1 FEB 2026 · 23:46 UTC | 11.6 keys | 8.54 keys |
| 15 FEB 2026 · 22:41 UTC | 12.1 keys | 9.20 keys |
| 1 MAR 2026 · 00:43 UTC | 12.9 keys | 7.23 keys |
| 8 MAR 2026 · 22:43 UTC | 12.3 keys | 7.70 keys |
| 22 MAR 2026 · 22:08 UTC | 13.9 keys | 7.54 keys |
| 10 APR 2026 · 10:30 UTC | 13.8 keys | 6.55 keys |
| 15 APR 2026 · 04:31 UTC | 12.3 keys | 7.53 keys |
| 3 MAY 2026 · 22:32 UTC | 12.9 keys | 5.11 keys |
| 17 MAY 2026 · 22:33 UTC | 13.1 keys | 8.61 keys |
| 1 JUN 2026 · 00:31 UTC | 13.3 keys | 8.85 keys |
| 15 JUN 2026 · 02:31 UTC | 12.6 keys | 7.56 keys |
| 29 JUN 2026 · 03:14 UTC | 9.02 keys | 7.86 keys |
| 5 JUL 2026 · 23:12 UTC | 9.08 keys | 7.90 keys |
| 22 JUL 2026 · 02:45 UTC | 9.29 keys | 8.09 keys |
| 3 AUG 2026 · 04:24 UTC | 10.4 keys | 8.99 keys |
| 10 AUG 2026 · 01:11 UTC | 7.93 keys | 6.88 keys |
| 21 AUG 2026 · 20:09 UTC | 9.86 keys | 8.57 keys |
| 22 AUG 2026 · 20:09 UTC | 9.92 keys | 8.63 keys |
| 23 AUG 2026 · 14:09 UTC | 9.92 keys | 8.63 keys |
| 26 AUG 2026 · 22:10 UTC | 9.96 keys | 8.66 keys |
| 28 AUG 2026 · 18:09 UTC | 10.1 keys | 8.77 keys |
| 29 AUG 2026 · 00:09 UTC | 10.1 keys | 8.78 keys |
| 29 AUG 2026 · 20:10 UTC | 10.1 keys | 8.77 keys |
| 30 AUG 2026 · 08:09 UTC | 10.3 keys | 8.95 keys |
| 30 AUG 2026 · 12:09 UTC | 10.5 keys | 9.15 keys |
| 30 AUG 2026 · 20:10 UTC | 10.4 keys | 9.00 keys |
| 2 SEP 2026 · 02:08 UTC | 10.0 keys | 8.73 keys |
| 3 SEP 2026 · 22:09 UTC | 10.9 keys | 9.51 keys |
| 4 SEP 2026 · 20:08 UTC | 10.8 keys | 9.34 keys |
Price history in numbers
66 readings since 25 Sep 2025Over the last 30 days the Contagious Eruption Undercover Brolly's sell price ranged from 7.93 keys to 10.9 keys and is up 35.6% after 21 moves. Over a year it ranged from 7.93 keys to 15.7 keys (down 19.3%). Today's 10.8 keys sits in the middle of its range: the lowest we have recorded is 7.93 keys (10 Aug 2026) and the highest 15.7 keys (16 Nov 2025). The price has moved 64 times since we began recording it — about once every 5 days.
| Window | Low | High | Change | Moves | Readings |
|---|---|---|---|---|---|
| 30 days | 7.93 keys | 10.9 keys | +35.6% | 21 | 23 |
| 90 days | 7.93 keys | 13.1 keys | −17.7% | 30 | 32 |
| a year | 7.93 keys | 15.7 keys | −19.3% | 64 | 66 |
Details
| SKU | 31262;5;u250 |
|---|---|
| Last price change | 2026-09-04 20:08 UTC |
| Key rate when recorded | 62.33 ref |
Same effect, other items
the effect across the catalogue| Item | Value | Updated |
|---|---|---|
| 590 keys | 10mo ago | |
| 105 keys | 10mo ago | |
| 29.9 keys | 7d ago | |
| 27.2 keys | 1d ago | |
| 27.2 keys | 3d ago | |
| 16.1 keys | 23d ago | |
| 15.4 keys | 2h ago | |
| 14.9 keys | 1mo ago | |
| 8.61 keys | 16h ago |
Other effects on the Undercover Brolly
same item, different effect| Item | Value | Updated |
|---|---|---|
| 125 keys | 7mo ago | |
| 91.2 keys | 8h ago | |
| 70.2 keys | 8h ago | |
| 59.4 keys | 14h ago | |
| 55.5 keys | 16h ago | |
| 51.9 keys | 10h ago | |
| 48.1 keys | 1d ago | |
| 47.1 keys | 10h ago | |
| 43.5 keys | 3d ago | |
| 31.2 keys | 2mo ago |
Priced similarly
across the catalogue| Item | Value | Updated |
|---|---|---|
| 10.4 keys | 21d ago | |
| 10.4 keys | 23d ago | |
| 10.4 keys | 2mo ago | |
| 10.5 keys | 5d ago | |
| 10.4 keys | 21d ago | |
| 10.4 keys | 2mo ago | |
| 10.8 keys | 6h ago | |
| 10.4 keys | 23d ago |