Screwed by Polymarket, this time the bug is a “time warp”

Author | Azuma (@azuma_eth)

In conventional understanding, time is linear, but the 加密貨幣 world has its “exceptions.”

Yesterday, Eastern Time (ET) completed the switch from Standard Time to Daylight Saving Time as per convention (typically at 2:00 AM on the second Sunday in March). The clock was moved forward by one hour, jumping directly from 2:00 AM on March 8 to 3:00 AM. Time didn’t vanish into thin air; it’s just that the Eastern Time region switches between Eastern Standard Time (EST) and Eastern Daylight Time (EDT) according to custom. The purpose is to artificially adjust the time scale to make better use of daylight hours (and incidentally save electricity).

For daily life, this switch doesn’t cause much impact. However, on the prediction market Polymarket, yesterday’s time zone switch directly sparked an unexpected controversy.

Polymarket Runs into Timing Controversy

The controversy occurred around the “Crypto Up or Down” prediction events on Polymarket.

Polymarket offers 加密貨幣currency price movement prediction events with timeframes of year, month, week, day, 4 hours, 1 hour, 15 minutes, and 5 minutes, covering mainstream tokens like BTC, ETH, SOL, and XRP. These events are automatically created and settled based on Eastern Time and have become a significant source of trading volume on Polymarket.

At 1:00 AM on March 8 (still under Eastern Standard Time at that moment), Polymarket launched a new batch of 1-hour up/down prediction events for BTC, ETH, SOL, and XRP. The relevant event links are as follows.

• BTC (Final Resolution: Up): https://polymarket.com/event/bitcoin-up-or-down-march-8-1am-et
• ETH (Final Resolution: Down): https://polymarket.com/event/ethereum-up-or-down-march-8-1am-et
• SOL (Final Resolution: Down): https://polymarket.com/event/solana-up-or-down-march-8-1am-et
• XRP (Final Resolution: Down): https://polymarket.com/event/xrp-up-or-down-march-8-1am-et

According to the event resolution rules — comparing the opening and closing prices of the 1-hour candlestick starting from the event’s commencement on Binance USDT trading pairs — all four events have now been settled.

However, because the end time of this batch of events coincided with the Daylight Saving Time switch, Eastern Time jumped directly from 2:00 AM to 3:00 AM at the moment it reached 2:00 AM (meaning the period from 2:00 AM to 3:00 AM was skipped). This caused some timing confusion for this batch of events on the Polymarket platform itself.

As shown on Polymarket’s frontend interface, perhaps because 2:00 AM did not exist in yesterday’s Eastern Time chronology, the time period currently displayed for this batch of events is “March 8, 1-1 AM ET” (i.e., March 8, 1:00 AM – 1:00 AM). Under normal timing, such events should display a 1-hour time period (for example, the previous day’s similar event was “March 7, 1-2 AM ET,” i.e., 1:00 AM – 2:00 AM). Considering the Daylight Saving Time switch, a more reasonable time period for this batch would be “March 8, 1-3 AM ET” (i.e., 1:00 AM – 3:00 AM, still essentially 1 hour).

So no matter how you look at it, the currently displayed “March 8, 1-1 AM ET” on the frontend is quite odd.

Chinese user “Xiao Z” (@richrichardoz) posted on X about this, stating that besides the frontend, Polymarket’s API also returned the “1-1 AM ET” time period, causing automated programs relying on API data to “all crash,” estimating losses exceeding $100,000 as a result.

“Xiao Z” further explained that having the start time and end time be exactly the same is a logically impossible market state. Many automated trading systems rely on the end time to determine trading windows, and this error directly caused his program to lose a significant amount of money. Therefore, he suggested that Polymarket change the time standard for related events to UTC and compensate users affected by the data issue.

Apart from this user, many other users on external platforms have also left comments expressing confusion under the related events. However, as of the time of writing, Polymarket has not responded through official channels.

Time Standards in Traditional Financial 市場s

Looking back at this controversy, while the scale of impact is not massive, it exposes a fundamental design flaw in Polymarket’s “Crypto Up or Down” market events.

Influenced by historical customs, economic status, and industry practices, Eastern Time is still widely used across various sectors. However, this is not particularly friendly to financial systems because Eastern Time switches between Daylight Saving Time and Standard Time every year — artificially moving the clock forward or back by one hour at specific times, creating “jumps” and “overlaps” in time, respectively.

In modern financial systems, UTC time has long become the de facto universal standard. In the vast majority of financial infrastructure, internal systems typically use UTC timestamps as the sole standard time. Local times like Eastern Time are still used but often exist only at the presentation layer facing users in terms of system logic. This design precisely aims to avoid uncertainty in the time system, ensuring that time remains monotonic, unique, and globally consistent in financial trading, clearing, and automated systems.

The key contradiction in Polymarket’s controversy lies in the fact that the related events used Eastern Time as the timing standard but failed to fully account for the potential variable of Daylight Saving Time switching, ultimately causing confusion in frontend and API data. Among the current user base of prediction markets, an increasing number of participants are trading via APIs and automated programs. Some minor issues that originally only affected frontend display can easily be amplified into real financial losses in automated systems.

From the outcome, this controversy may not be considered a serious incident, and theoretically, it could occur at most twice a year. However, what it reveals is a more serious design issue — as prediction markets gradually evolve towards financial infrastructure, they must also adhere to the engineering standards adopted by financial infrastructure.

本文源自網路： Screwed by Polymarket, this time the bug is a “time warp”

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