Promoters for the IndyCar race scheduled to zoom through the Seaport this Labor Day say they've inked necessary agreements with the city and several state agencies to hold the event, capping months of meetings and negotiating.

The memorandums of understanding come after race organizers and public officials had agreed to a letter of intent late last year, in which IndyCar promoters say they would cover "any and all costs" associated with the event. At the time, both sides agreed to hold multiple meetings to hash out an agreement, in addition to a series of public meetings.

Promoters say they reached agreements this week with MassDOT, the MBTA, the Massachusetts Convention Center Authority and MassPort, in part ensuring that the Grand Prix of Boston "assumes all costs associated with the race with no burden to taxpayers," according to promoters.

John Casey, Grand Prix of Boston president, said in a statement that the agreements were "the culmination of a lot of hard work, coordination and leadership from all of the agencies involved."

The event is scheduled to run Sept. 2-4 along a temporary 2.2-mile course that weaves around the Boston Convention & Exhibition Center and through the Seaport.

It's faced opposition from a number of Seaport residents, as well as the group Coalition Against IndyCar Boston, which has pushed issues ranging from environmental concerns to noise levels.

Promoters say they still need to hash out a "road improvement and traffic management plan," as well as details around transportation and safety and security. They said this week's agreements also established an "irrevocable letter of credit protecting the (city and state) agencies from any unforeseen costs should the race not occur."

Walsh signed a deal last year bringing the race to Boston for up to five years.

An aide to Gov. Charlie Baker said his office worked with the state agencies and the city to secure the agreements and "provide safeguards for taxpayers and residents."

"The administration will continue to coordinate with all participants on an event that will support Massachusetts’ tourism economy and expects organizers to meet all standard project construction and permitting requirements," Lizzy Guyton, a Baker spokeswoman, said in a statement.

Walsh's office said he was similarly "encouraged" that race promoters are meeting the necessary requirements for the event.

"We look forward to the next step in the process," Walsh's spokeswoman, Laura Oggeri, said.