curl --request GET \
  --url https://xbt-mainnet.gomaestro-api.org/v0/esplora/mempool \
  --header 'api-key: <api-key>'

{
  "count": 8134,
  "vsize": 3444604,
  "total_fee": 29204625,
  "fee_histogram": [
    [
      53.01,
      102131
    ],
    [
      38.56,
      110990
    ],
    [
      34.12,
      138976
    ],
    [
      24.34,
      112619
    ],
    [
      3.16,
      246346
    ],
    [
      2.92,
      239701
    ],
    [
      1.1,
      775272
    ]
  ]
}