> For a complete page index, fetch https://developer.close.com/llms.txt

# Custom Field Schemas

A Custom Field Schema presents you with *all* (regular and shared) Custom Fields that belong on a given object, in the order you've defined. It's the best endpoint to use when asking "What Custom Fields can I set on this object?"

The `object_type` in the URL can be one of: `lead`, `contact`, `opportunity`, `activity/<cat_id>`, `custom_object/<cotype_id>`.