Selling everything from fishballs and fried chicken to dimsum and coconut ice cream their business is booming as tens of thousands of people take to the streets in protests against the government and the monarchy.
By the time most protesters show up, the first hawkers are there with mobile food carts.
The sellers are ready to move in an instant and use their mobile phones to scrutinise announcements from protest groups, which announce protest sites at the last minute to confound police.
Protests, which started in July, grew even bigger last week after they were banned by Prayuth Chan-ocha, the former military ruler the protesters seek to oust. They also want to curb King Maha Vajiralongkorn's powers.
For some, the protest is not only a source of income.
"I’m both here to sell and to support the protesters. I hate Prayuth very much," he said, complaining that under Prayuth's rule his income fell to 700 baht ($22) a day from 2,000 before. At protests, he reckons to make 1,000 baht a day.
"I go to every protest," said 37-year-old Win, another fishball seller. "The stuff is sold out within only a couple of hours."