eth_blockNumber), while others can be more complex and require more resources(e.g.
eth_call). Each method is assigned a certain number of computational units derived from the global average duration of each method.
For Free Tier, some APIs like enhanced NFT APIs support 300 free trials.
web3_sha3(15 CUs), two
eth_blockNumber(16 CUs) requests in the same second, you will have a total of 47 CUPS.