Mediafire's API:

# Get file info
POST https://www.mediafire.com/api/1.5/file/get_info.php
quick_key=FILE_KEY
response_format=json

# Get folder info
POST https://www.mediafire.com/api/1.4/folder/get_info.php
recursive=yes
folder_key=FOLDER_KEY
response_format=json

# List folders in folder
GET https://www.mediafire.com/api/1.4/folder/get_content.php
content_type=folders
filter=all
order_by=name
order_direction=asc
chunk=1
version=1.5
folder_key=FOLDER_KEY
response_format=json

# List files in folder
GET https://www.mediafire.com/api/1.4/folder/get_content.php
content_type=files
filter=all
order_by=name
order_direction=asc
chunk=1
version=1.5
folder_key=FOLDER_KEY
response_format=json