A Micro-purchase is a government purchase under $10,000. The threshold for micro-purchases was $ 3,500 or $5,000 for the DoD, but it was raised with the National Defense Authorization Act (NDAA) for the fiscal year of 2018
Micro-purchases generally do not require a contract and can be made with a government-approved credit card called SmartPay. A procurement officer would generally use this credit card to purchase a product or service required by the federal employee. The normal cards have a limit of $3,000 but, there are higher spending limit cards that go up to $15,000 inside the United States and $25,000 outside the U.S.