From Notion's API documentation:

"A block object represents content within Notion. Blocks can be text, lists, media, and more. A page is a type of block, too!"

So far, only text-like blocks are currently available. View the Notion API documentation for more info.

Content blocks:

Heading 1

Heading 2

Heading 3

This is a paragraph block with bold text, strikethrough text, underline text, code text, italicized text and text in a different color.

• bulleted list 1
  1. child list item 1
• bulleted list 2
• bulleted list 3

1. numbered list 1
2. numbered list 2
3. numbered list 3

• [ ] To do list item