Quay Brings Crypto Payments to a Shop’s Existing QR Code on Sui

Scan a shop’s QR code, pay with crypto, and let the shop receive digital dollars. That is the idea behind Quay, a Singapore payments project built on Sui.

Quay took first place in the DeFi & Payments track at Sui Overflow 2026. Sui’s official winners announcement describes it as live in Singapore. That recognition does not establish Foundation investment or a security audit.

A familiar checkout, with different money behind it

According to Quay’s documentation, shoppers scan a participating merchant’s existing SGQR sticker, choose a supported token from their Sui wallet, review the quote and sign. The merchant receives a stablecoin — USDsui by default — rather than the customer’s chosen token.

The practical appeal: shoppers could spend tokens without first moving money through an exchange and bank. Merchants would not have to accept every token or replace their QR sticker.

An existing sticker does not mean every SGQR shop automatically accepts Quay. Its documentation requires merchants to submit proof of business ownership, pass review and register a payout address.

How it works

Quay says Cetus finds a swap route into the merchant’s settlement token, with pricing information from Pyth. The swap and transfer share one Sui transaction: if either fails, the whole transaction reverses.

Supported tokens depend on liquidity and available routes. Quay says it sponsors shoppers’ network fees; this does not mean swaps or optional cash-out are free of costs.

Receiving a stablecoin is not the same as receiving Singapore dollars in a bank account. Quay describes its optional SGD cash-out as beta, off by default, and routed through a Quay-operated treasury. Licensed settlement remains on its roadmap, and the team says it is working through regulatory questions with counsel.

What is confirmed

The official Sui announcement confirms the competition result and describes Quay as live in Singapore. The website and documentation explain the product. SuiWire has not independently completed a payment, verified merchant numbers or audited the contracts.

The project’s X account is @quay_sui. The latest original post identified in this check was August 30, 2026, so this is not a claim of frequent recent posting or a fresh launch.

For everyday users, the proposition is simple: spend supported crypto at a participating shop, while the shop receives a stablecoin. Its real-world usefulness will depend on merchant acceptance and reliable settlement.