The strongest competitor to stablecoin corridors in Asia is not the card networks and was never the banks. It is the domestic instant-payment schemes and the linkages being built between them, and any displacement analysis that ignores them is doing US commentary with Asian names pasted in.
What already works
Domestic account-to-account (A2A) schemes solved instant, near-free domestic transfer years ago without a blockchain. PayNow in Singapore, UPI (Unified Payments Interface) in India, and PromptPay in Thailand lead the class, with peers across the region and FedNow the belated US entry. For a consumer or small business inside any of these markets, the marginal payment is instant, final, and free or nearly so. That is the baseline a new rail has to beat domestically, and nothing beats it, which is why the serious contest is cross-border.
The linkages are the part to track, and their current state is precisely measurable.
- PayNow-PromptPay went live on 29 April 2021, the first linkage of national instant-payment systems anywhere, and still runs with retail-scale caps: SGD 1,000 a day from the Singapore side and THB 25,000 a day from the Thai side as of 2026 (MAS). The Bank of Thailand has signalled intent to raise limits for business use; no increase had landed as of August 2026.
- PayNow-UPI went live on 21 February 2023 and expanded to 19 Indian banks in July 2025, with caps of SGD 1,000 a day from Singapore and INR 60,000 a day from India (MAS). Corridor-level volumes are not published.
- UPI abroad is live in 9 markets as of June 2026, but mostly as merchant acceptance for travelling Indians rather than remittance plumbing; Singapore remains the only full person-to-person linkage.
- Project Nexus is the structural bet: rather than N-squared bilateral links, a multilateral hub. Nexus Global Payments, the operating entity, was incorporated in Singapore in March 2025 by the central banks of India, Malaysia, the Philippines, Singapore, and Thailand, with Bank Indonesia as special observer; Malaysia's PayNet and Singapore's NETS have been appointed operators and technical development began in early 2026, with go-live reported variously for 2026 and, in later and more specific coverage, 2027 (BoT).
Why the schemes win what they win, and where they stop
The A2A model's advantages come from who sponsors it. It is regulator-backed, so the compliance perimeter is native rather than bolted on. It settles in commercial-bank money against central-bank infrastructure, so nobody debates what the settlement asset is worth. And it is free or near-free to the end user because the sponsoring states want it to be, which is a subsidy no private rail can out-price.
Its limits are just as baked in, and the caps tell the story. SGD 1,000 a day is a remittance product, not a B2B one, and 5 years after the first linkage the caps have not moved. Governance is government-to-government, which is why each bilateral link took years and why Nexus, the fix for bilateral pace, is itself arriving on a multilateral timetable. There is no USD leg, and the region's trade still invoices heavily in dollars. And the schemes stop at the account boundary; they cannot hold programmable balances, collateralise, or settle against tokenised assets.
The corridor verdicts
- Intra-ASEAN plus India retail corridors. Where a link exists, it is the better product for the sub-SGD 1,000 ticket today, and Nexus at scale would extend that across the founding markets. The stablecoin opportunity here is a window, open until Nexus works, and windows in payments have a habit of staying open longer than roadmaps suggest; the honest position is that regulator-sponsored plumbing wins these corridors on a 3 to 5 year view.
- Corridors the schemes do not reach. US and Gulf originations into the Philippines and Indonesia, and any corridor needing a USD leg, have no A2A answer today. This is where stablecoin remittance volume is real, and where banks are responding defensively: Bank of the Philippine Islands' stablecoin remittance build with Meridian, coordinated with the Bangko Sentral ng Pilipinas against 38.34 billion dollars of 2024 inbound remittances, is a receiving bank defending deposits rather than a scheme defending rails (Ledger Insights).
- Business flows above the caps. Neither the bilateral links nor Nexus addresses these yet, which leaves the field covered in Part 5 to tokenised deposits and stablecoins.
The quiet-incumbent conclusion is the one US-centric commentary keeps missing: in Asia, the public sector is not a bystander watching private rails race. It is a competitor with its own product, and in the corridors it has chosen to serve, it is winning.