---
pretty_name: Polymarket Microstructure — Free Preview (26–29 Jun 2026)
license: cc-by-nc-4.0
language:
  - en
tags:
  - finance
  - prediction-markets
  - polymarket
  - order-book
  - market-microstructure
  - crypto
  - sample
size_categories:
  - 1M<n<10M
---

# Polymarket Microstructure — Free Preview

A free four-day sample (**26–29 June 2026**) of the Polymarket CLOB dataset, so
you can inspect the exact schema, file layout and manifest format before buying.
Four underlyings (BTC, ETH, SOL, XRP), the same Parquet + sha256-manifest
packaging as the full dataset.

The full history is sold separately at
[`astrnvk/polymarket-orderbook-data`](https://huggingface.co/datasets/astrnvk/polymarket-orderbook-data).

**→ Browse, price and buy at the storefront:
[polymarket-microstructure](https://astrnvk-polymarket-microstructure.static.hf.space)**
— $5/day for 1–6 days, $4/day for 7–29, $3/day beyond a month, all four assets
included. Incomplete days cost proportionally less, and the storefront shows the
full arithmetic before you pay.

## Why these specific days

These are the **earliest days of collection, and deliberately the roughest** —
they show you the format *and* our worst coverage, so there are no surprises
after purchase:

| Date | Coverage | Note |
|---|---|---|
| 2026-06-26 | ~61% | Collector went up mid-day |
| 2026-06-27 | 90–95% | Collection still being tuned |
| 2026-06-28 | 90–95% | Collection still being tuned |
| 2026-06-29 | ~34% | Down 00:42–16:00 UTC for a planned migration |

The paid dataset (from 30 June onward) does not carry these particular gaps:
measured uptime there runs from 95.8% to 100%, and every day is priced from its
own figure.

## What's in each file

| Table | Time column | Contents |
|---|---|---|
| `book_snaps` | `ts` | Best bid / ask stream — **not** a full ladder (`level`/`size` are placeholders) |
| `clob_trades` | `ts` | Trades with taker side |
| `spot_klines` | `ts` | Spot candles for the underlying |

**Three tables, not six — and that is the point of showing these days.**
`book_depth` does not exist here: it starts 20 July 2026. `book_meta` and
`clob_trades_ws` start 21 July. So this sample shows you the schema and the
packaging, but it cannot show you order-book depth, because there is none to
show for June.

This sample also predates the 21 July migration, so timestamps are *receipt*
time quantized to whole seconds and `ts_ms` / `spread` are `NULL`. Paid data
from 21 July onward uses millisecond exchange time, carries ≈88 depth levels per
event, and populates `spread`. See the full dataset card for details.

Every Parquet file ships with a `<file>.manifest.json` (sha256, row count,
interval bounds).

## Terms

Collected from the public Polymarket API. Not affiliated with Polymarket.
This preview is provided for evaluation under CC BY-NC 4.0. Nothing here is
trading advice.