For a visitor with no return trip planned, a few hundred yen on a transit card can remain unused for years. UnSui’s target is simple: help departing travellers put that leftover value back to use.

42.7mInternational visitor arrivals in 2025

≈117,000Arrivals per day, averaged over the year

¥213mIllustrative annual leftover-balance scenario

Source: Japan National Tourism Organization (JNTO), January 2026 estimate: 42,683,600 arrivals. Counts are visits, not unique people, transit-card users or measured departures.

JR EAST FACT BOOK 2026

Suica kept growing through the year to March 2026.

124.35mSuica cards issued by 31 March 2026

+10.98mMore cards issued in that fiscal year alone

42.14mMobile Suica, including 7.92 million added that year

Source: JR East Fact Book 2026, published 17 September 2026, IT & Suica. Cumulative cards issued (万枚): Suica 12,435, up from 11,337 a year earlier; Mobile Suica 4,214, up from 3,422. Figures are as of the fiscal year ended 31 March 2026.

A SCENARIO, NOT A MEASURED MARKET TOTAL

42.7m visits × 10% with unused card value × ¥500 left over ≈ ¥213m per year.

The 10% share and ¥500 balance are assumptions to test with travellers. This is potential leftover value, not UnSui revenue, confirmed recoverable funds or a count of existing stranded balances. Card eligibility and adoption would narrow the opportunity.

A first balance for a wallet you control.

The proposed experience lets a traveller direct an eligible payout to a self-custody wallet, turning a small leftover balance into a way to try on-chain apps. The product goal is fewer steps and less unnecessary data collection.

The browser demo needs no identity documents and moves no funds. Live funding is not promised as “KYC-free”: identity checks depend on the payment and conversion providers and applicable requirements.

Explore the payment architecture

BUILT AT ETHGlobal Tokyo 2026PAYOUTS ON Sui · Ethereum · AwajiON DEVICE dGen1 × NFCSee a mainnet payout

01 / THE EXPERIENCE

One card.
Three simple moments.

A familiar tap. A clear balance. A receipt that stays with you. Try the whole journey in your browser.

Tap into your journey.

On dGen1, NFC reads your card’s balance and recent trips. In the web demo, a sample card is ready for you.

Give your balance a destination.

Enter a .sui name, ENS name or wallet address, or use your dGen1 wallet. Review the quote and confirm with another scan.

Keep the proof.

Follow confirmation in the app, then open the transaction on its explorer. Your receipt and refund history stay available.

Try the interactive demo

02 / UNDER THE HOOD

A small tap.
A verifiable trail.

Mainnet payouts, a hosted ledger and a dashboard that brings every recorded refund into view.

Explore a live receipt

Read on the device

The Android app reads FeliCa balance and history over NFC. The dGen1 wallet integration can request an Ethereum address signature.

Record on Sui

A Move contract holds the SUI treasury and records refund totals, sequences and unique claims. Payment and recording happen atomically.

Verify the receipt

SHA-256 links each immutable receipt to the previous refund. A four-leaf Merkle tree commits the card identifier, recipient, amount and observed balance.

A clear quote before you confirm

Sui quotes use the SUI/JPY market rate with a 2% fee. Awaji pays 1 MJPY per net yen. Refunds above ¥1,000 require a World ID check before confirmation.

The operator attests to the NFC scan. A receipt proves the Sui refund record; it does not prove a debit from a transit card. This is an independent hackathon prototype, not a JR East service.

03 / YOUR OPERATIONS WORKSPACE

Every payout.
Your point of view.

See hosted refund records, recipients and transaction links in one place. Arrange the workspace yourself, or ask the assistant.

Make room for what matters.

Choose, reorder and resize cards on Overview and Treasury. Switch table views and show the columns you need.

Follow the transaction.

Find an order, check its payout and open the blockchain explorer. Keep sample orders and app records easy to distinguish.

Ask for a different view.

“Show only payouts and latest journeys.” The assistant changes display settings, with Undo when you want to go back.

Explore the dashboard

WATCH DEMO

A journey worth showing.

Play the project presentation

04 / SEE IT IN MOTION

From the first tap,
to the confirmed payout.

Watch UnSui in action: scan a transit card, choose a payout wallet, and follow the refund through its receipt and dashboard.

Watch Demo Open the interactive demo

The next stop: your phone.

The standalone Android app connects to the hosted backend over Wi-Fi or mobile data, without a laptop.
Android · ARM64 · 21 MB. Built for dGen1 and compatible NFC phones.

Download APK

Your last stop.A new beginning.

¥1,500 JPY

Your recent journey

Millions of journeys.Value left at the last stop.