Pongsuk said he was paid Bt70,000 for the job and was told the party was to launch an e-commerce website and hand out awards.
He insisted his U-Token advertising speech at the event came from a readymade script and he had no intention to drum up membership for UFUN.
“If I had known then that UFUN’s business was [allegedly] illegal, I would not have accepted this job,” he added.
Assistant national police chief Suwira Songmetta said police would keep Pongsak as a witness.
The video clip of the event yielded incriminating evidence against arrested suspect Apichanat Saenkla, who hired Pongsak, he added.
Suwira said the case would be submitted to public prosecutors tomorrow.