Bitbank Tightens Rules on Transfers Linked to Polymarket

Japan’s crypto exchange Bitbank has warned customers that transactions tied to prediction market platforms—including Polymarket—could lead to account suspensions. In a notice posted Monday, the exchange said it may restrict deposits and withdrawals connected to such services, citing possible conflicts with Japan’s gambling laws.

The warning underscores the uncertainty prediction markets face in markets where local legal definitions around “gambling” are likely to intersect with tokenized or crypto-adjacent infrastructure. For users, it also signals that exchanges may adopt a risk-avoidance stance even without an explicit government ruling aimed specifically at prediction platforms.

Key takeaways

• Bitbank said it may suspend accounts if deposits or withdrawals are connected to prediction market services, including platforms that let users place bets on future events.
• Suspended users would lose access to core exchange functions such as logging in, making deposits/withdrawals, and trading.
• Bitbank did not cite a specific regulatory action or directive, suggesting the move is driven by legal interpretation and compliance risk.
• Bitbank’s stance highlights why some prediction market operators may face additional friction when expanding into Japan.

Why Bitbank is drawing a hard line

In its notice, Bitbank indicated that it could restrict accounts involved in transactions connected to prediction market platforms. The exchange framed the issue around potential legal exposure: it said that platforms allowing users to bet on election results, sports outcomes, or other future events could be treated as gambling under Japanese law when the activity is carried out for financial gain.

Bitbank also made clear what happens next for affected users. It said that customers whose accounts are suspended would lose access to a range of services, including account login capabilities as well as deposits, withdrawals, and crypto trading.

The exchange added that it would not be liable for damages customers incur due to the suspension measures. It further urged customers to be cautious with external services and avoid involvement in criminal activity or legal disputes—language that signals the company is trying to reduce the odds that users’ activities could spill into compliance problems for the exchange itself.

Regulatory uncertainty, not a named enforcement trigger

Notably, Bitbank did not point to any specific government directive or enforcement action that prompted the warning. Instead, the notice reads as a preventative step: the exchange appears to be reacting to how prediction markets could be classified under existing Japanese gambling-related rules.

This distinction matters for investors and users because it suggests the risk may be structural rather than tied to a single new policy. If the concern is the legal characterization of prediction market activities—rather than a particular regulator order—then the compliance approach from exchanges could persist even if no immediate crackdown is announced.

Cointelegraph asked Bitbank what prompted the notice, but the exchange had not responded by the time of publication.

Polymarket expansion plans collide with local compliance reality

The Bitbank warning arrives as Polymarket explores the possibility of expanding into Japan. Earlier coverage from Cointelegraph noted Polymarket’s interest in entering the country amid broader regulatory scrutiny of prediction markets.

At the same time, prediction markets have faced mounting challenges in multiple jurisdictions. Regulators in different countries have taken actions against Polymarket and Kalshi over gambling-related concerns—an environment that has made “where you operate” a crucial part of a prediction platform’s strategy.

Polymarket’s current access policy, according to its documentation, lists Japan among 35 restricted jurisdictions. The listing reflects how the company has treated the market so far. However, the company signaled in May that it was considering expansion in Japan, which raises immediate questions about how it might operate there without triggering gambling-law conflicts.

While Japan has not issued formal guidance specifically addressing prediction markets, Bitbank’s notice indicates that at least some crypto-related businesses are taking a cautious approach—potentially in anticipation of how regulators or courts could interpret prediction market activities.

What users should watch next

For Japanese exchange customers, Bitbank’s announcement is a reminder that “regulatory risk” in crypto markets can materialize as operational restrictions, not just as fines or public enforcement actions. Readers should watch for follow-up changes from other exchanges, and for whether prediction market platforms adjust user access or transaction flows in Japan.

The next key signal will be whether regulators clarify how prediction markets are treated under existing gambling frameworks—or whether exchanges continue to enforce their own conservative compliance standards in the absence of formal guidance.

This article was originally published as Bitbank Tightens Rules on Transfers Linked to Polymarket on Crypto Breaking News – your trusted source for crypto news, Bitcoin news, and blockchain updates.