curl --request GET \
  --url https://xbt-mainnet.gomaestro-api.org/v0/rpc/mempool/transactions/{tx_hash} \
  --header 'api-key: <api-key>'

{
  "data": {
    "ancestorcount": 123,
    "ancestorsize": 123,
    "bip125-replaceable": true,
    "depends": [
      "<string>"
    ],
    "descendantcount": 123,
    "descendantsize": 123,
    "fees": {
      "ancestor": 123,
      "base": 123,
      "descendant": 123,
      "modified": 123
    },
    "height": 123,
    "spentby": [
      "<string>"
    ],
    "time": 123,
    "unbroadcast": true,
    "vsize": 123,
    "weight": 123,
    "wtxid": "<string>"
  },
  "last_updated": {
    "block_hash": "<string>",
    "block_height": 123
  }
}