Polymarket in Japan (2026) | Frontend Now Geoblocked + Legal Grey Area

Polymarket now geoblocks its web frontend for Japanese IP addresses — polymarket.com no longer lets users place orders from within Japan. The block is applied at the website level (the underlying API is not geofenced), but for ordinary users who trade through the site the platform is effectively closed. This sits on top of a pre-existing issue: Japanese gambling law already placed prediction markets in a legal grey area. Japan has one of the world’s strictest — and most mature — crypto regulatory frameworks.

Current Status: Blocked (Frontend Geoblocked)

Japan is now on Polymarket’s frontend geoblock list. Visiting polymarket.com from a Japanese IP address no longer lets you place orders — the web interface is restricted. Two important nuances:

• The restriction is applied at the frontend (website) level. Polymarket’s underlying API is not geofenced, so it is not an absolute block the way an OFAC-sanctioned country is.
• For the vast majority of users — who trade through the website — Japan is effectively blocked.

This is separate from, and in addition to, Japan’s domestic gambling laws, which already created legal uncertainty:

• Japanese gambling statutes broadly prohibit wagering from within Japan, even when the operator is overseas
• The National Police Agency has warned that online gambling from Japan is criminal regardless of where the platform is based
• Prediction markets have not been specifically classified by any Japanese regulator

Some users in restricted regions report accessing prediction markets through various methods. The deposit, tax, and market details below remain relevant for anyone accessing Polymarket from outside Japan or managing an existing position.

The Legal Grey Area

Japan’s approach to online gambling is strict but creates an ambiguous situation for prediction markets:

Gambling Law

• Japanese law prohibits most forms of gambling (the Penal Code makes gambling a criminal offence)
• Exceptions exist for public racing (horse, boat, bicycle, motorcycle), lottery, and sports betting through authorized channels
• Online gambling from Japan is criminal regardless of whether the operator is based overseas

The Regulatory Gap (Domestic Law)

Separately from Polymarket’s own frontend block, Japanese law leaves prediction markets in an unresolved position:

• The FSA has not issued specific guidance on prediction markets
• Prediction markets fall into a regulatory gap — they’re not clearly gambling, securities, or a financial product under current law
• One legal analysis identifies three possible classifications: (a) illegal gambling, (b) a regulated financial product, or (c) a “points and data” product that mimics forecasting without crossing into cash betting
• No Japanese enforcement action has been taken against Polymarket or its users — the frontend geoblock is Polymarket’s own decision, not a government order

The FSA’s Priorities

The FSA is focused on a major crypto regulatory overhaul that could eventually affect prediction markets:

• Moving crypto from PSA to FIEA — reclassifying crypto from the Payment Services Act to the Financial Instruments and Exchange Act (the same framework governing securities)
• 105 major digital assets will be reclassified as “financial products”
• Insider trading prohibitions being introduced for crypto
• Exchange liability reserves mandated after the $305M DMM Bitcoin hack
• Spot crypto ETFs planned by 2028 under a multi-year roadmap

Prediction markets are not on the FSA’s immediate agenda, but if prediction markets were ever classified as financial instruments rather than gambling, they could potentially become legal under this new framework.

Domestic Prediction Market Activity

Despite the legal uncertainty, Japan has some domestic prediction market activity:

• Gumi / Gc Labs announced plans in October 2025 to build an AI + blockchain prediction market, aiming for a “fair, transparent, and compliant” model. No launch date set.
• POYP operates a points-based prediction service that deliberately avoids cash wagering to stay outside gambling law — similar in concept to pachinko’s indirect prize-exchange model.

How to Deposit from Japan

Access note: With the Polymarket frontend now geoblocked for Japanese IPs, the steps below apply to users who reach the platform from outside Japan or who already hold a funded account. Buying USDC inside Japan is unaffected.

Japan has one of the world’s most mature crypto exchange ecosystems — and buying USDC just got much simpler.

The Direct Route: SBI VC Trade

In March 2025, SBI VC Trade became the first and only platform in Japan licensed to trade USDC. This created a direct JPY-to-USDC on-ramp that didn’t previously exist. SBI VC Trade also launched a USDC lending service in March 2026 offering 10% annual interest.

Circle and SBI Holdings established a joint venture in August 2025 to promote USDC adoption in Japan. Additional exchanges (Binance Japan, bitbank, bitFlyer) have announced plans to list USDC, but timing is unconfirmed as of March 2026.

Step 1: Buy USDC

Note on DMM Bitcoin: DMM Bitcoin was hacked for $305 million in May 2024 (attributed to North Korean hackers). It shut down in March 2025 and transferred all customer accounts to SBI VC Trade. This incident prompted the FSA to mandate exchange liability reserves.

If using a non-USDC exchange: Buy BTC or ETH, transfer to a platform that supports USDC swaps, then swap to USDC. The SBI VC Trade route is significantly simpler.

Step 2: Transfer USDC to Polymarket

1. Go to Deposit on Polymarket
2. Select Use Crypto and copy your deposit address
3. Send USDC from SBI VC Trade to the Polymarket address
4. Choose Polygon for the lowest fees ($3 minimum)

For the full walkthrough, see our How to Deposit on Polymarket guide.

Tax Considerations (Important)

Japan has among the highest crypto tax rates in the world:

Key points:

• Every crypto-to-crypto trade, crypto-to-fiat sale, and crypto use is a taxable event
• Annual reporting required for gains exceeding ¥200,000
• No distinction between short-term and long-term gains

2026 Tax Reform: Japan’s December 2025 tax reform package introduces a flat 20% rate for qualifying crypto assets — the same rate applied to stock gains. Approximately 105 cryptocurrencies qualify. The reform also introduces a 3-year loss carryforward. However, implementation may be delayed until as late as 2028. Gains from platforms like Polymarket (not on registered exchanges) may remain classified as miscellaneous income at the higher rate.

Keep detailed records of all Polymarket trades for tax reporting.

Japan-Related Markets on Polymarket

There are 250+ Japan-related event contracts actively traded on Polymarket, including:

• BOJ (Bank of Japan) interest rate decisions
• Japanese election outcomes
• Economic indicators (GDP, CPI, employment)
• Yen exchange rate movements

Getting Started

Because polymarket.com is now frontend-geoblocked for Japanese IP addresses, getting started from within Japan is no longer straightforward. For those who can reach the platform (for example, from outside Japan), the flow is:

1. Sign up for Polymarket — under 2 minutes, no KYC
2. Buy USDC on SBI VC Trade (direct JPY-to-USDC) or another FSA-registered exchange
3. Deposit on Polymarket — transfer USDC via Polygon
4. Place your first trade — start small while learning

Related Guides

• All Country Guides — Check availability for every country
• Country Availability Checker — Instant status lookup for 190+ countries
• What Is Polymarket? — Full introduction
• How to Sign Up for Polymarket — Create your account
• How to Deposit on Polymarket — Full deposit guide
• How to Trade on Polymarket — Market orders, limit orders, and tips
• Polymarket Fees Explained — Fee breakdown by category (or use the fee calculator)
• Polymarket Review 2026 — Our honest review after 3 years of trading