A ETH 4-hour up/down market is a binary prediction market that resolves on whether Ethereum's price is higher or lower at the end of a 4-hour window than at its open. A new contract opens and settles every 4 hours, so the order book turns over continuously. DepthFeed captures the full bid/ask ladder of these markets on Polymarket and Limitless — every level, not just the top of book — alongside the underlying ETH spot price.
How ETH 4-hour up/down markets work
Each contract references Ethereum's price at the moment the window opens (the "price to beat"). The "Up" side pays out if the settlement price is above that level; the "Down" side pays if it is below. Because the window is only 4-hour, pricing tracks short-term ETH momentum and implied volatility very tightly.
On a binary market the Up and Down prices are complements: a bid of p on Up is an offer of 1 − p on Down. That is why we capture both sides of the book — the depth on the opposite side is what sets the true implied probability, and it is invisible if you only record last-trade prices.
What DepthFeed captures for these markets
For every ETH 4-hour market on Polymarket and Limitless, DepthFeed records the complete order book — all resting bid and ask levels and their sizes — on a sub-second cadence, then joins each snapshot to the underlying ETH spot price at the same instant. Settled markets keep their final book and resolution, so you can study how depth and the implied probability moved into settlement.
Everything is served over the same REST API and live WebSocket stream as the rest of DepthFeed, addressed by coin and window — there is nothing market-specific to learn.
Venue coverage
| Venue | Window | What we capture | History from |
|---|---|---|---|
| Polymarket | 4-hour | Full bid/ask depth + underlying price, sub-second | January 2026 |
| Limitless | 4-hour | Full bid/ask depth + underlying price, sub-second | rolling history |
Specification
| Asset | Ethereum (ETH) |
| Horizon | 4-hour (settles every 4 hours) |
| Market type | Binary up/down (Up pays if higher at settlement) |
| Venues captured | Polymarket and Limitless |
| Captured | Full order-book depth — every level, both sides |
| Reference price | ETH spot, joined to each snapshot |
| Access | REST API + live WebSocket stream |
First-party figures measured June 21, 2026.
Pull the full order book for ETH 4-hour markets over a REST API and live WebSocket. Free Explorer tier, no card.
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