Trade: Casa Pia AC vs. Rio Ave FC - Halftime Result
Resolution criteria on PolyGram: In the upcoming Primeira Liga game between Casa Pia AC and Rio Ave FC, scheduled for May 16, 2026 at 1:00 PM ET: This event contains halftime result markets for home, draw, and away outcomes within the first 45 minutes of regular play plus stoppage time.
PolyGram is an on-chain prediction market where you trade YES or NO outcome shares with real USDC on Polygon. For this market, buy YES if you believe the event will happen, or NO if you think it won't. Your maximum loss is your stake — winning shares pay $1.00 each at resolution. Unlike sportsbooks, there is no house edge: prices are set by supply and demand from other traders and reflect the crowd's real-time probability.
- Liquidity
- $5K
- Total Volume
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- 24h Volume
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- Open Interest
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Market outcomes
| Casa Pia AC | 41% YES | 59% NO |
| Draw | 40% YES | 61% NO |
| Rio Ave FC | 19% YES | 81% NO |
Market context
Casa Pia AC will host Rio Ave FC in a Primeira Liga fixture on 16 May 2026, with settlement determined by the halftime scoreline after 45 minutes plus stoppage time. The 41% implied probability for a Casa Pia halftime victory reflects current order book positioning on Polymarket, where traders are pricing the home side's chances of leading at the interval.
Casa Pia finished the 2024–25 season in mid-table, whilst Rio Ave has historically been a competitive mid-tier side in Portugal's top division. Halftime markets in Primeira Liga fixtures typically see home-side probabilities range between 35–50%, depending on relative league position and recent form. Casa Pia's home record and Rio Ave's away performance will be material factors; teams playing at home tend to establish early pressure, though the 41% probability suggests the market is pricing meaningful uncertainty about whether this translates to a first-half goal advantage.
Traders should monitor team news in the week preceding the match, particularly injury updates to key attacking or defensive personnel that could affect early-game tempo. Rio Ave's recent away form and Casa Pia's home conversion rate in opening periods will be relevant inputs. Weather conditions on match day and any late tactical adjustments announced before kickoff could shift the order book. The settlement window closes at 17:00 UTC on match day, providing a narrow window for final position adjustments as kickoff approaches at 18:00 UTC.
Wikipedia Context
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Casa PiaThe Casa Pia is a Portuguese institution founded by Maria I, known as A Pia, and organized by Police Intendant Pina Manique in 1780, following the social disarray of the 1755 Lisbon earthquake. For almost three centuries, thousands of young boys and girls were raised by Casa Pia, including many public personalities, called casapianos. Casa Pia is Portugal's
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Casa Pia A.C.Casa Pia Atlético Clube, commonly known as Casa Pia, is a Portuguese multi-sports club founded in 1920 and based in Lisbon, Portugal, best known for its professional football team, that competes in the Primeira Liga. The club is named after Casa Pia, a Portuguese children's charity, and many of its athletes come from that institution. Its football stadium is
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Casa Pia child sexual abuse scandal
The Casa Pia child sexual abuse scandal was a case of child sexual abuses involving a number of children and employees at Casa Pia, a Portuguese state-run institution for the education and support of poor children and under-age orphans. One employee of the institution, which at the time comprised 10 orphanages and schools caring for 4,600 children, ran a mal
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Casa Pia and College of the Orphans of Saint JoachimCasa Pia and College of the Orphans of Saint Joachim is a Roman Catholic church, school, and orphanage in Salvador, Bahia, Brazil. It was constructed as a Jesuit novitiate in the early 18th century. After the expulsion of the Jesuits from Brazil in 1759 the complex became an orphanage. The now complex now consists of a secondary school, chapel, and orphanage
Resolution source
This market settles from the official outcome published at https://www.ligaportugal.pt/. 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 "Casa Pia AC vs. Rio Ave FC - Halftime Result" are the same as any other PolyGram sporting 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.
- Sign in on polygram.ink with your email — no full KYC under $1,500 lifetime trading volume.
- Deposit USDC on Polygon (lowest fees, ~$0.01 per transaction) or Ethereum. Funds credit after 12 confirmations.
- 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.
- Size your position. If you stake 100 USDC at 50% YES, you'll receive shares that pay $200 if YES resolves true — a 100% gross return. If NO resolves, your shares are worth $0.
- 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.
- 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.
How active is this market?
$0 in lifetime turnover and $5K of resting liquidity puts this market in the below the median by volume for sports contracts on PolyGram. Order-book depth is thin — large orders may need to be split across the book or executed as limit orders.
The market has been open for under a month — fresh enough that information asymmetry remains a real factor.
Higher-volume markets tend to have tighter spreads and faster price discovery — meaning the displayed YES/NO percentages are more likely to reflect the true crowd-implied probability rather than a single trader's directional view.
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.
Frequently asked questions
How does this market resolve?
Resolution is sourced from https://www.ligaportugal.pt/. Settlement is executed by the UMA optimistic oracle on Polygon, with a 2-hour dispute window before payouts clear.
When does this market close?
This prediction market is scheduled to close on 16 May 2026. After the resolving event occurs, settlement typically clears within 24 hours once the UMA optimistic oracle confirms the outcome. All payouts are in USDC on the Polygon network.
How can I trade on "Casa Pia AC vs. Rio Ave FC - Halftime Result"?
To trade on this prediction market, create a free PolyGram account at polygram.ink, deposit USDC via Polygon, and place a YES or NO order on the outcome you believe in. You can learn more on our how-it-works page. Your maximum loss is limited to your stake — there is no leverage or margin.
What happens when the market resolves?
When the outcome is determined, winning YES shares pay out $1.00 each in USDC, while losing shares pay $0. Settlement is handled by the UMA optimistic oracle on Polygon — a proposer submits the result, a two-hour dispute window opens, and if uncontested, payouts are distributed automatically. You can withdraw your winnings to any Polygon wallet.
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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