The portal will provide developers access to select NAB APIs so they can connect to select sets of NAB data.
Beginning initially as a closed beta with approval for a small number of developers, NAB says it plans to run an open beta with greater participation next year.
Two NAB APIs will be released initially, with data relating to branch and ATM locations and foreign exchange rates respectively.
NAB chief operating officer Antony Cahill said: "We have invested in our technology and built a rich source of APIs that we have been using for both internal purposes and external partnerships to leverage capabilities and deliver better experiences for our customers.
"With the rise of the digital age and evolving customer expectations, APIs have become core to banking infrastructure to enable rapid deployment of various functions across multiple channels to meet those customer needs and quickly keep pace as those needs evolve."
Cahill said the bank;s API strategy was based on three key streams of customer enablement, partnership arrangements and open API categorisation of which the portal would be an integral part.
"We are collaborating with a number of partners to both provide and receive data leveraging API technology including Xero, MYOB and VISA. We want to keep building our ecosystem with like-minded organisations to allow us opportunities to innovate and improve our experiences for customers," he said.