Class A Query:

graphql
query {
  viewer {
    accounts(filter: { accountTag: "b9e510810e1e12fcd40826d266a1fb12"}) {
      r2OperationsAdaptiveGroups(
        filter: {
          date_geq: "2023-04-01",
          date_leq: "2023-04-30",
          actionType_in:["ListBuckets","PutBucket","ListObjects","PutObject","CopyObject","CompleteMultipartUpload","CreateMultipartUpload","UploadPart","UploadPartCopy","PutBucketEncryption","ListMultipartUploads"],
          actionStatus_in:["success","userError"]
        },
        limit: 10000
      ) {
        dimensions {
          bucketName
        }
        sum {
          requests
        }
      }
    }
  }
}

Class B query:

graphql
query {
  viewer {
    accounts(filter: { accountTag: "b9e510810e1e12fcd40826d266a1fb12"}) {
      r2OperationsAdaptiveGroups(
        filter: {
          date_geq: "2023-04-01",
          date_leq: "2023-04-30",
          actionType_in:["HeadBucket","HeadObject","GetObject","ReportUsageSummary","GetBucketEncryption","GetBucketLocation"],
          actionStatus_in:["success","userError"]
        },
        limit: 10000
      ) {
        dimensions {
          bucketName
        }
        sum {
          requests
        }
      }
    }
  }
}

Replace Account Id with your own. That's the same queries the dashboard uses for Class A/ Class B showing