Bitcoin 5-Minute Market Orderbook Depth — 2026-08-21

On 2026-08-21, full orderbook depth was captured for 288 Polymarket BTC 5-minute Up/Down market rounds — approximately 62,292 bid/ask snapshots totalling 412.9 MB of JSONL. Each snapshot lists every price level and size for both the Up and Down side.

288
Rounds recorded
~62,292
Depth snapshots
412.9 MB
Raw size
1.1¢
Avg opening spread
Up side, best ask − best bid

Replay the day's most active round

btc-updown-5m-1787343300_orderbook.jsonl produced 1.57 MB of snapshots — the deepest recording of 2026-08-21. Watch both books evolve from open to resolution: the Up-side spread tightened from 1¢ to 1¢ as the outcome crystallised. Bars show size at each level, scaled within each ladder.

4.96 min left
frame 1/48▸ auto-playing — drag to scrubUp-side spread: 1¢
UP token
4.96 min remaining
pricesize
0.65169.7
0.64176.66
0.631,026
0.62173.15
0.61140
0.6242.5
0.59419
0.5880
0.57238.99
0.56162.6
0.5598.28
0.548.14
spread1¢
0.53357.4
0.52160.6
0.5125
0.5526
0.49965
0.4835
0.4785
0.4695
0.45237.11
0.44240
0.43131
0.42406
DOWN token
4.96 min remaining
pricesize
0.58436
0.57161
0.56270
0.55277.11
0.54105
0.5395
0.5235
0.51965
0.5526
0.4932.6
0.48160.6
0.47347.02
spread1¢
0.461.29
0.4585.86
0.44157.6
0.43238.99
0.4260
0.41280
0.4377.5
0.39140
0.38173.15
0.371,026
0.36198.66
0.35169.7

Showing 48 sampled snapshots, 12 levels nearest the touch on each side. The raw JSONL carries the complete ladder — every level, every ~1.5 seconds, for both tokens.

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