Singapore's stock closed slightly lower on Tuesday as investors look towards a European Central Bank policy decision on further rate cuts later this week.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 3,591.15 and 3,622.71 throughout the day. It ended the session at 3,595.47, down 0.44 points or 0.01% compared to Monday's close.

In company news, shares of Singapore Paincare (SGX:FRQ) fell over 4% after the company outlined plans to invest around SG$1.5 million to digitally transform its clinical and medical operations.

Beng Kuan Marine (SGX:BEZ) was up over 2% after the marine and offshore company was removed from the watch-list of the SGX after its exit application was approved in-principal by the governing body.

Meanwhile, Rex International (SGX:5WH) was down nearly 2% after its subsidiary, Lime Petroleum, roped in ABG Sundal Collier to arrange fixed income investor meetings to raise around 550 million Norwegian kroner through the tap mechanism in its existing senior secured bond.