curl --request GET \
  --url https://tonapi.io/v2/blockchain/masterchain-head

{
  "tx_quantity": 130,
  "value_flow": {
    "from_prev_blk": {
      "grams": 10000000000,
      "other": [
        {
          "id": 13,
          "value": "10000000000"
        }
      ]
    },
    "to_next_blk": {
      "grams": 10000000000,
      "other": [
        {
          "id": 13,
          "value": "10000000000"
        }
      ]
    },
    "imported": {
      "grams": 10000000000,
      "other": [
        {
          "id": 13,
          "value": "10000000000"
        }
      ]
    },
    "exported": {
      "grams": 10000000000,
      "other": [
        {
          "id": 13,
          "value": "10000000000"
        }
      ]
    },
    "fees_collected": {
      "grams": 10000000000,
      "other": [
        {
          "id": 13,
          "value": "10000000000"
        }
      ]
    },
    "fees_imported": {
      "grams": 10000000000,
      "other": [
        {
          "id": 13,
          "value": "10000000000"
        }
      ]
    },
    "recovered": {
      "grams": 10000000000,
      "other": [
        {
          "id": 13,
          "value": "10000000000"
        }
      ]
    },
    "created": {
      "grams": 10000000000,
      "other": [
        {
          "id": 13,
          "value": "10000000000"
        }
      ]
    },
    "minted": {
      "grams": 10000000000,
      "other": [
        {
          "id": 13,
          "value": "10000000000"
        }
      ]
    },
    "burned": {
      "grams": 10000000000,
      "other": [
        {
          "id": 13,
          "value": "10000000000"
        }
      ]
    }
  },
  "workchain_id": 0,
  "shard": "8000000000000000",
  "seqno": 21734019,
  "root_hash": "131D0C65055F04E9C19D687B51BC70F952FD9CA6F02C2801D3B89964A779DF85",
  "file_hash": "A6A0BD6608672B11B79538A50B2204E748305C12AA0DED9C16CF0006CE3AF8DB",
  "global_id": -239,
  "version": 0,
  "after_merge": true,
  "before_split": true,
  "after_split": true,
  "want_split": true,
  "want_merge": true,
  "key_block": true,
  "gen_utime": 1674826775,
  "start_lt": 23814011000000,
  "end_lt": 23814011000001,
  "vert_seqno": 0,
  "gen_catchain_seqno": 0,
  "min_ref_mc_seqno": 0,
  "prev_key_block_seqno": 0,
  "prev_refs": [
    [
      "(-1",
      4234235,
      "8000000000000000)"
    ]
  ],
  "in_msg_descr_length": 0,
  "out_msg_descr_length": 0,
  "rand_seed": "131D0C65055F04E9C19D687B51BC70F952FD9CA6F02C2801D3B89964A779DF85",
  "created_by": "A6A0BD6608672B11B79538A50B2204E748305C12AA0DED9C16CF0006CE3AF8DB",
  "gen_software_version": 0,
  "gen_software_capabilities": 0,
  "master_ref": "(-1,4234234,8000000000000000)"
}

{
  "error": "<string>",
  "error_code": 123
}