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Charlie Kirk 's memorial cost taxpayers a pretty penny to keep safe ... 'cause we've learned the United States Secret Service paid an event company millions to secure the perimeter.

We've obtained documents that show the Secret Service paid ARCUS Group, LLC -- a full-service event management and disaster relief aid company -- was paid $2,677,416.19 to protect the perimeter of the ceremony at State Farm Stadium in Glendale, Arizona. Play video content

ARCUS has experience with perimeter protection at high-profile events. Their website touts their past perimeter protection jobs which include President Donald Trump 's 2021 inauguration ... so, clearly the administration feels confident in the services they provide.

Kirk's funeral obviously needed heightened security ... takin

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