Trade: Will Little Joe escape again?
Resolution criteria on PolyGram: This market will resolve to "Yes" if Little Joe the gorilla escapes again between market creation and July 31, 2026. Otherwise, this market will resolve to "No". For the purposes of this market, an "escape" consists of the gorilla getting out of his enclosure in an uncontrolled way. For example, his scheduled transfer to another zoo or removal from the enclosure for vet visits or maintenance will not qualify. This market will resolve according to information from the Pittsburgh Zoo, the Franklin Park Zoo, or a consensus of credible reporting. Damaging or disrupting animal enterprises is a federal crime under the The Animal Enterprise Terrorism Act (AETA) of 2006 (18 U.S.C. § 43).
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
- $4K
- Total Volume
- $115
- 24h Volume
- $115
- Open Interest
- $101
Market outcomes
| Will Little Joe escape again? | 3% YES | 97% NO |
Market context
Little Joe, a western lowland gorilla housed at Pittsburgh Zoo & PPG Aquarium, famously escaped his enclosure in April 2012, leading to his shooting and death. The market assesses the probability of another uncontrolled escape by the same or a successor gorilla at Pittsburgh Zoo or Franklin Park Zoo (where Little Joe's offspring are housed) before 31 July 2026. Current order book pricing implies a 3% probability of such an event occurring within the settlement window.
Historical precedent suggests gorilla escapes remain rare events at accredited facilities. Little Joe's 2012 escape occurred during a period when enclosure standards were less stringent; subsequent industry-wide reviews and infrastructure upgrades at major zoos have substantially reduced breach risks. No comparable escapes at Pittsburgh Zoo have occurred since 2012, and Franklin Park Zoo maintains modern containment protocols. The 3% implied probability reflects both the low baseline frequency of such incidents and confidence in contemporary zoo management practices.
Traders should monitor announcements regarding enclosure maintenance schedules, staffing changes, or structural modifications at either facility, as these could indicate heightened escape risk during construction phases. Any public statements from either zoo's director regarding animal welfare incidents or safety reviews warrant attention. Media coverage of gorilla behaviour or health issues at the relevant facilities could also shift market sentiment, though routine veterinary care and scheduled transfers explicitly do not constitute escapes under market rules.
Wikipedia Context
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Little Joe (electric locomotive)The "Little Joe" is a type of railroad electric locomotive built by General Electric. The locomotives had 12 axles, eight of them powered, in a 2-D+D-2 arrangement. They were originally intended to be exported to the Soviet Union and designed to operate on Soviet Railways (SZhD) 3,300-volt DC overhead line system. They were never exported to the Soviet Union
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Little Joe IILittle Joe II was an American rocket used from 1963 to 1966 for five uncrewed tests of the Apollo spacecraft launch escape system (LES), and to verify the performance of the command module parachute recovery system in abort mode. It was named after a similar rocket designed for the same function in Project Mercury. Launched from White Sands Missile Range in
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Little Joe (film)Little Joe is a 2019 drama film co-written and directed by Jessica Hausner. Starring Emily Beecham as Alice Woodard, a plant breeder and single mother who creates "Little Joe", a plant that gives its caretakers joy.
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Little Joe (rocket)Little Joe was a solid-fueled booster rocket used by NASA for eight launches from 1959 to 1961 from Wallops Island, Virginia to test the launch escape system and heat shield for Project Mercury capsules, as well as the name given to the test program using the booster. The first rocket designed solely for crewed spacecraft qualifications, Little Joe was also
How this market resolves
Resolution is handled by the UMA optimistic oracle on Polygon. A proposer submits the outcome, a two-hour dispute window opens, and if no one stakes a counter-claim the payout is final. Contested outcomes escalate to UMA token-holder voting. Payouts clear in USDC to the winning side.
How to trade this market step by step
The mechanics for trading "Will Little Joe escape again?" 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.
- 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 3% YES, you'll receive shares that pay $3333 if YES resolves true — a 3233% 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?
$115 in lifetime turnover and $4K of resting liquidity puts this market in the below the median by volume for zoo contracts on PolyGram. Order-book depth is thin — large orders may need to be split across the book or executed as limit orders.
Last 24 hours alone saw $115 in turnover, well above the lifetime daily-average for this market — a clear sign of news catalysing trader activity right now.
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
What is the current probability for "Will Little Joe escape again?"?
As of today, traders on Polymarket price this outcome at 3%. The number updates continuously as the order book clears. PolyGram mirrors the same live odds with locale-aware formatting and USDC settlement.
How does this market resolve?
Resolution is handled by the UMA optimistic oracle on Polygon. A proposer submits the outcome, a 2-hour dispute window opens, and if uncontested the payout is final. Contested outcomes escalate to UMA token holders.
When does this market close?
This prediction market is scheduled to close on 31 July 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 "Will Little Joe escape again?"?
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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