National ITMX Company Limited changed its name from ATM Pool Company Limited. The company aims to broaden its business scope and provide more diverse services, all while supporting the advancements and rapid changes in the e-Commerce business and online financial transactions made through various electronic media at both the domestic and international levels. According to the Bank of Thailand's objective of reducing payment system costs and increasing linkages between various payment services, the company was established through the collaboration of Thai commercial banks in response to the policy of the Payment Systems Committee (PSC) in order to maximize services efficiency and security. The company has committed to developing and operating the ITMX system (Interbank Transaction Management and Exchange), which serves as an infrastructure and standard for the country's payment system and cross-border funds transfers. In order to provide the future support of electronic commercial transactions and cross-border linkages payment system, the ITMX system will offer various transaction services through a variety of electronic channels, e.g. ATMs, over-the-counter services, internet banking, and mobile banking application. The goal is to provide all users with an electronic financial transaction system that is simple, secure, and capable of adapting and responding quickly to changing business conditions.

The company was established through the collaboration of Thai commercial banks in response to the policy of the Payment System Committee (PSC), in accordance with the Bank of Thailand's objective of reducing payment system costs and increasing linkages between various payment services in order to maximize services efficiency and security.

ITMX system (Interbank Transaction Management and Exchange) serves as an infrastructure and standard for the country's payment system and cross-border funds transfers offering various electronic transaction services through a variety of channels, e.g. ATMs, over-the-counter services, internet banking, and mobile banking application.

- Bulk Payment system service launched
- Single Payment system service launched
- Cross Border ATM Cash Withdrawal system service launched
- Local Switching system service launched
- NSW Bank Gateway system service launched
- PromptCard service launched to support Thai Standard chip card for debit cards
- e-GP Bank Gateway system service launched

The Ministry of Finance, Bank of Thailand, and Thai Bankers' Association officially launched "PromptPay" service PromptPay is an alternative service that allows transferring and receiving money using mobile phone numbers and/or identity numbers as an alternative to account numbers. Introducing a more convenient and cost-effective solution to send and receive money between users, PromptPay service is an important step toward driving the National e-Payment strategic plan and establishing the foundation for Thailand's digital economy's development.

The company first introduced PromptPay service for funds transfer between banks that has been provided to member banks since then. With the introduction of a bill payment service for legal entities/businesses, billers will be able to receive payments from product or service bills issued by another bank without having to open an account with every bank. Customers of billers are not required to register PromptPay to make a payment at the participating banks.

The company was chosen by Asian Payment Network (APN) members to be APN Hub, serving as a hub for connecting payment and transfer systems across 11 countries of Asian Payment Network (APN) starting from June 2017, including: 1) Thailand, 2) Malaysia, 3) Vietnam, 4) Indonesia, 5) Philippines, 6) Singapore, 7) South Korea, 8) Japan, 9) China, 10) Australia, 11) New Zealand.

The company started providing PromptPay for billing to member banks. PromptPay billing services is an extension service of the PromptPay system infrastructure that allows retailers and businesses to send billing requests to buyers or users via messaging.

The company launched MyPromptQR, a new PromptPay system that enables retailers to scan the QR codes of their customers. Introduced to member banks. The new type of PromptPay service provided under the ISO20022 standard, providing a convenient payment option for department stores and large-scale retailers to scan their customers' QR codes. Offering a faster and more convenient method, customers can save time from waiting in payment queue.

Cross-Border QR Payment through mobile banking has been operational since December 2019.
Customers can scan QR codes of overseas retailers to boost the convenience of both customers and retailers. Banking institutions of both countries can conduct transactions with efficiency and security while reducing the need for cash.

The company started providing PromptPay for cross-border bill payment via QR code, having Japan as a pioneering destination. Introduced to member banks. First operated with Japan, PromptPay's QR payment service for cross-border transactions makes it easier for customers to purchase goods and services in foreign countries. The service was then expanded to other countries, including Cambodia in 2020.

The company developed and launched a new Bulk Payment service to member banks. In response to business sector demands and to support governance transactions, the development and provision of Bulk Payment services under ISO20022 were introduced to replace the previous system, which had been in use for over ten years.

The company launched the world's first system linkage of real-time fund transfer services between two countries, PromptPay and PayNow. Through a collaboration between the Bank of Thailand (BOT) and the Monetary Authority of Singapore (MAS), the launch of the world's first linkage between the two countries' payment systems, including Thailand's PromptPay service and Singapore's PayNow service, provides QR cross-border service with Vietnam, Malaysia, and Indonesia.

The company started providing Cross-Border Remittance Service. The service has enabled instant funds transfers between participating countries via mobile banking of participating banks using mobile phone numbers.

The company started providing Digital Supplychain Finance system. The service helps SMEs to more easily access loans from financial sources through the new infrastructure, PromptBiz, which enables credibility from large buyers to be passed on to supplier-SMEs through banks, resulting in less time and procedures for requesting credit approval.

The company started providing Trade Document Registry (TDR) system to member banks. The phase 1 of Trade Document Registry (TDR) system launched for checking the Duplicate Financing of customers of member banks.

The company develops operational systems to support the transfer of ICAS service from BOT to the ITMX system. In response to BOT policy, various banking associations (including TBA, AIB, and GFA) agreed to the development of the Imaged Cheque Clearing System (ICS) currently under BOT to be operated on the ITMX system. The ICS service has launched on July 15, 2022.