Thailand's ITMX Bulk Payment system, operated by National ITMX, processed 64.4 million transactions during the second half of 2025, sustaining the batch clearing backbone of one of Southeast Asia's most digitally advanced payment markets.
National ITMX was incorporated in 2005 as a joint venture between 35 Thai member banks and two non-bank institutions to operate the country's interbank transaction infrastructure. The company runs four core services: ATM switching, card switching, bulk payments, and single fund transfers including PromptPay. The bulk payment arm underwent significant modernization in February 2021 when NITMX deployed ACI Worldwide's enterprise payments platform with native ISO 20022 support. Bank of Thailand statistical reporting redesignated the system as ITMX Bulk Payment (SMART) following this migration.
Monthly transaction volumes in H2 2025 ranged from 8.9 million in August to 16.3 million in September, a pattern driven by Thailand's payroll and government disbursement cycles. The September spike, nearly double the preceding month, reflects quarter-end government payments and fiscal year processing that channels through the batch system. Monthly values tracked between THB 470 billion and THB 602 billion across the period, with December recording THB 600 billion across 11.8 million transactions. On an average business day, the system clears approximately 500,000 transactions worth around THB 25 billion.
Settlement for ITMX Bulk Payment occurs within BAHTNET operating hours between 08:30 and 16:30 ICT. The Bank of Thailand classifies the system as a Prominently Important Retail Payment System, placing it under enhanced supervisory oversight alongside PromptPay and other nationally significant payment infrastructure.
While PromptPay dominates Thailand's real-time payment landscape with over 81 million registrations and 2.1 billion monthly transactions as of early 2025, ITMX Bulk Payment serves a distinct function. The batch system handles salary disbursements, government transfers, pension payments, and corporate batch processing that depend on reliable overnight and intra-day clearing cycles rather than instant execution.
Thailand's payment ecosystem illustrates a pattern observed across Asia-Pacific markets where mature instant payment infrastructure coexists with batch systems. Indonesia operates BI-FAST alongside SKNBI, Singapore runs FAST in parallel with Interbank GIRO, and the Philippines maintains InstaPay alongside PESONet. In each case, the real-time and batch channels serve complementary market segments rather than competing for the same transaction flows.