One real hour. Raw ticks, L1, L2, trades, reference data — bundled.

A 60-minute slice of BTC Up or Down 4h (2026-05-19 14:00–15:00 UTC), cut straight from our archive. Same files we'd ship a paying customer, scoped to one series so the bundle stays small enough to poke at on a laptop. Pick the format that matches your tooling — both contain the same data.

What's in the zip.

Files

Timestamps

Every record carries up to three timestamps:

• ts_recv_ns — local receive time in nanoseconds since the Unix epoch, captured as close to socket-read as possible. Authoritative for ordering.
• ts_src_ms — upstream Polymarket timestamp in milliseconds since the Unix epoch, when present in the payload.
• ts_recv_iso — ISO-8601 UTC mirror of ts_recv_ns, for convenience.

raw.jsonl — schema

Each line is a JSON object with a capture envelope plus the verbatim upstream payload:

{
  "source": "polymarket_market_ws",
  "collector_id": "collector-cloud-main-g2",
  "run_id": "run-...",
  "conn_id": "conn-...",
  "msg_seq": 545692077,
  "ts_recv_ns": 1779199200081988852,
  "ts_recv_iso": "2026-05-19T14:00:00.081988Z",
  "ts_src": "1779199200023",
  "event_type": "price_change" | "book" | "tick_size_change" | "last_trade_price",
  "token_id": null,
  "condition_id": "0x...",
  "parse_ok": true,
  "parse_error": null,
  "payload_sha256": "...",
  "payload_text": "{...JSON string of the original message...}"
}

payload_text is the original Polymarket message as a JSON string, preserved byte-for-byte (aside from being re-encoded into JSON-safe form). Parse it again to recover the upstream object.

l1.parquet — columns

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

source_event_type indicates which upstream event triggered the L1 update (book, price_change, etc.).

l2.parquet — columns

ts_src_ms, ts_recv_ns, ts_recv_iso, condition_id, token_id,
event_kind, source_event_type, msg_seq,
bid_levels, ask_levels,
best_bid, best_ask, payload_best_bid, payload_best_ask, bid_ask_reconciles,
bid_px_1..bid_px_25, bid_sz_1..bid_sz_25,
ask_px_1..ask_px_25, ask_sz_1..ask_sz_25

Each row is a full snapshot of the orderbook for one token after the update, padded with NaN past the deepest level present. bid_ask_reconciles flags rows where our reconstructed top-of-book matches what the payload declared.

trades.parquet — columns

ts_src_ms, ts_recv_ns, ts_recv_iso, condition_id, token_id,
price, size, side, fee_rate_bps, transaction_hash, msg_seq

Derived from last_trade_price events; one row per matched fill.

Joining

• A token_id joins to tokens.token_id → tokens.market_id → markets.market_id → markets.event_id → events.event_id.
• A condition_id joins to markets.condition_id directly.
• Each market's two outcome tokens are listed in markets.yes_token_id / markets.no_token_id.

Source

Captured by TickFoundry from Polymarket's public market websocket (wss://ws-subscriptions-clob.polymarket.com/ws/market). This bundle is a static hour-long sample published for evaluation. For full historical coverage, join the waitlist below or get in touch.