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A one-hour slice of the BTC Up or Down 4h series — 2026-05-19 14:00–15:00 UTC · 64 events · 63 markets · 126 tokens. The exact inbound websocket messages we recorded, plus the normalized L1 / L2 / trades layer derived from them — exactly as you'd receive it. Free with a sign-up; no card. See the docs for the full schema — or look before you sign up: a fully worked notebook of this exact bundle (book heatmap, mid/spread, size at the touch).

Schema · l1.parquet

columntypedescription
ts_recv_nsint64collector receive time, ns since epoch — authoritative ordering
ts_src_msint64upstream Polymarket timestamp, ms (when present)
condition_id · token_idstringjoin keys into reference/markets + tokens
best_bid · best_askfloat64best resting bid / ask, in probability
best_bid_size · best_ask_sizefloat64size resting at the touch
spreadfloat64ask − bid, 3 decimal places
source_event_type · msg_sequpstream trigger · gap-audited sequence

First rows · l1.csv (verbatim)

ts_src_ms ts_recv_ns ts_recv_iso condition_id token_id best_bid best_bid_size best_ask best_ask_size spread source_event_type msg_seq 1779199200034 1779199200360501376 2026-05-19T14:00:00.360501Z 0x29f4…a2a6 1957…5648 0.36 18 0.4 45.57 0.04 price_change 531578191 1779199200034 1779199200360501376 2026-05-19T14:00:00.360501Z 0x29f4…a2a6 3809…2680 0.6 45.57 0.64 18 0.04 price_change 531578191 1779199200038 1779199200360532169 2026-05-19T14:00:00.360532Z 0x29f4…a2a6 1957…5648 0.36 9 0.4 45.57 0.04 price_change 531578195 1779199200038 1779199200360532169 2026-05-19T14:00:00.360532Z 0x29f4…a2a6 3809…2680 0.6 45.57 0.64 9 0.04 price_change 531578195 1779199200041 1779199200360556843 2026-05-19T14:00:00.360556Z 0x29f4…a2a6 1957…5648 0.36 9 0.37 5 0.01 price_change 531578201

Shortened for display only: 1957…5648 is a 76-digit decimal token_id, 0x29f4…a2a6 a 66-character hex condition_id. The download carries full values.

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