curl --request POST \
  --url https://api.example.com/EXPERIMENTAL_view_access_key_list \
  --header 'Content-Type: application/json' \
  --data '
{
  "method": "EXPERIMENTAL_view_access_key_list",
  "params": {
    "block_id": 1,
    "account_id": "<string>"
  },
  "id": "dontcare",
  "jsonrpc": "2.0"
}
'

{
  "result": {
    "block_hash": "<string>",
    "block_height": 1,
    "keys": [
      {
        "access_key": {
          "nonce": 1,
          "permission": "FullAccess"
        },
        "public_key": "<string>"
      }
    ]
  },
  "id": "<string>",
  "jsonrpc": "<string>"
}