{ "$schema": "https://json-schema.org/draft/2020-12/schema", "$id": "https://opensea.io/schemas/Fee", "title": "Fee", "type": "object", "properties": { "fee": { "type": "number", "format": "double" }, "recipient": { "type": "string" }, "required": { "type": "boolean" } }, "required": [ "fee", "recipient", "required" ] }