Trade: Ethereum Up or Down - May 31, 9:35AM-9:40AM ET

Market context

This market resolves based on whether Ethereum's price according to Chainlink's ETH/USD data stream is higher or equal at 9:40AM ET on 31 May 2026 compared to 9:35AM ET that same morning. The five-minute window captures intraday volatility during US morning trading hours, when equity markets are open and institutional participation typically peaks. Settlement uses Chainlink's oracle feed rather than spot exchange prices, which may exhibit minor discrepancies from centralised exchange quotes due to aggregation methodology.

The 0% implied probability reflects the inherent difficulty of directional prediction over such compressed timeframes. Historical five-minute price movements in major assets like Ethereum show roughly even distribution between up and down outcomes when examined across large sample sizes, though microstructure effects—order flow imbalances, flash crashes, and liquidity provision patterns—create non-random clustering. Current Polymarket order book depth at extreme probabilities typically indicates thin liquidity, meaning the 0% price may reflect sparse trading rather than genuine consensus that downward movement is certain.

Traders should monitor scheduled events on 31 May 2026 that could trigger volatility during the morning window, including Federal Reserve communications, major economic data releases, or cryptocurrency-specific announcements. Chainlink's data feed aggregates prices from multiple sources with a slight lag, so spot market movements may precede oracle updates by seconds. Liquidity conditions and bid-ask spreads on major ETH trading venues during that specific five-minute window will ultimately determine realised price action, making this contract sensitive to execution timing and order book depth rather than directional conviction.

Resolution source

This market settles from the official outcome published at https://data.chain.link/streams/eth-usd. A proposer submits the final result to the UMA optimistic oracle on Polygon; the two-hour dispute window closes and payouts clear in USDC.

How to trade this market step by step

The mechanics for trading "Ethereum Up or Down - May 31, 9:35AM-9:40AM ET" are the same as any other PolyGram event contract. Each YES share resolves to $1 if the event happens, or $0 if it doesn't. The current price between 0¢ and 100¢ is the market's probability estimate, set live by the order book.

1. Sign in on polygram.ink with your email — no full KYC under $1,500 lifetime trading volume.
2. Deposit USDC on Polygon (lowest fees, ~$0.01 per transaction) or Ethereum. Funds credit after 12 confirmations.
3. Pick a side. Buy YES if you believe the event will happen; buy NO if you think it won't. The current YES price reflects the market's collective probability.
4. Size your position. If you stake 100 USDC at 0% YES, you'll receive shares that pay $200 if YES resolves true — a 100% gross return. If NO resolves, your shares are worth $0.
5. Set risk controls (optional). Stop-loss, take-profit, and limit-order types all supported. Use the trade ticket's slippage box to cap your maximum entry price.
6. Wait for resolution. When the event resolves on-chain via the UMA optimistic oracle, the winning side settles to 100¢ automatically and USDC hits your balance within seconds. Withdrawable to any wallet you control.

Key terms

YES / NO share

A binary outcome token that pays $1.00 if the underlying claim resolves true (YES) or false (NO), and $0 otherwise. The market price between 0¢ and 100¢ is the implied probability.

CLOB

Central limit order book. The matching engine that pairs YES buyers with NO buyers (effectively the same trade). Polymarket's CLOB on Polygon executes trades on-chain via the conditional-tokens framework.

Liquidity

USDC capital sitting in resting limit orders inside the order book. Deeper liquidity means smaller slippage on large trades and a tighter bid-ask spread.

UMA optimistic oracle

The on-chain dispute system that settles each Polymarket market. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution.

Slippage

The difference between the displayed mid-price and your fill price. Affects market orders most; limit orders avoid slippage but may take time to fill.

Conditional token

ERC-1155 outcome share issued by Gnosis Conditional Tokens on Polygon. The token type that resolves to $1.00 or $0.00 at settlement.

See the full prediction-market glossary →

Frequently asked questions

Risk and regulatory note

Prediction-market positions can lose 100% of staked capital. Outcomes are uncertain by definition — historical accuracy of crowd-implied probabilities is high in aggregate but not for any single market. PolyGram does not provide investment advice. Trade only with capital you can afford to lose.

Regulatory status varies by jurisdiction. Germany, the United States, and most EU countries treat Polymarket-style event contracts under one of three frameworks: financial derivative, gambling product, or unregulated novel asset. Consult local counsel before trading.

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