A compute unit (CU) is a measure of the requests needed to query computationally expensive API endpoints. Each request has a price and rate limit cost that is measured in compute units. It’s important to note that some APIs have dynamic pricing that will cost more compute units the more inputs you add for the request. Learn more about compute units here: https://docs.moralis.io/web3-data-api/compute-units-cu#what-is-a-compute-unit-cu