There is a significant rule trap. Even if hostilities actually resume or actions inconsistent with the ceasefire occur (e.g., closing a strait), the market will resolve to 'No' unless the US government or Trump explicitly labels it a 'breach' or 'violation' of the ceasefire in their statement. Additionally, breaches solely attributed to Israel do not qualify.

This is a geopolitical prediction. While US-Iran conflicts are common macro topics, betting on whether a ceasefire breaks within a specific tight window, contingent strictly on the 'official phrasing' of the announcement, adds a level of novelty and specific conditional constraints.

An official announcement that the US-Iran ceasefire has broken would trigger severe market panic. Crude Oil prices would experience a structural spike due to Middle East geopolitical risks and supply disruption threats. Safe-haven assets like Gold and US Treasuries (driving the US 10Y Yield down) would see aggressive bidding. Concurrently, risk assets like the S&P 500 would face a massive downward shock.

2026-04-14 to 2026-04-17, the Yes price of the April 21 option continued to decline from 28.5c down to 10.5c (touching 8.5c at one point). The reason is that as the deadline rapidly approaches without any official statements from the US or Trump regarding a ceasefire breach (and with US officials actively refuting Iran's claims of a US violation), accelerating time decay has significantly eroded the risk premium. 2026-04-12 to 2026-04-14, the Yes price of the (now expired) April 14 option plummeted from 22.5c to 1.2c due to the extreme proximity to its deadline without any official announcements, causing the market to heavily discount the likelihood of a sudden incident.

The market pricing is significantly disconnected from current weather forecasts. The prediction market assigns the highest probability to the 82-85°F range, whereas recent public weather forecasts project rain and a significant cooldown on April 18, with highs only reaching around 71-72°F. This divergence is likely due to the market's failure to digest the latest cold front forecast [3, 6].

Predicting the exact daily high temperature in a specific city on a given day is a highly niche weather derivatives market. Unless someone is a local resident or a specialized weather trader, the general public would not naturally consider or care about this question, making it quite a novelty.

April 15, 2026 - April 16, 2026, the price of 40°C surged from 20.5c to 49.5c as weather forecasts stabilized, confirming the high would be near 104°F (40°C). April 15, 2026 - April 16, 2026, the price of 42°C plummeted from 26c to 2c as new data ruled out the likelihood of reaching this extreme heat. April 15, 2026 - April 16, 2026, the price of 39°C fluctuated significantly between 11.5c and 32c, reflecting shifting market expectations on whether the temperature might fall slightly short of 40°C.

April 16, 2026 - April 17, 2026, the price of 18°C steadily climbed from 31.5c to 53.5c, while the price of 17°C dropped significantly from 44.5c to 24.5c. This occurred because, as time progressed, the latest high-resolution weather models further anchored the expected peak temperature at 18°C, reducing the likelihood of a cooler peak. April 16, 2026 - April 17, 2026, the price of 16°C plummeted from 13.2c to 1.5c, as morning real-time temperatures and short-term forecasts definitively ruled out the scenario where the high would only reach 16°C.

April 16, 2026 - April 17, 2026, the price of the 18°C option surged from 38.5c to 99.7c, while the 19°C option dropped to 0.2c. This was due to actual meteorological observations on April 17 confirming a peak temperature of 18°C, bringing certainty to the market. April 15, 2026 - April 16, 2026, the price of the 19°C option increased from 25.5c to 37.5c, while the 17°C option dropped from 24c to 13c. This was due to updated meteorological models revising the expected high temperature upwards, shifting the expected temperature center from 17°C-18°C to 18°C-19°C.