Register Underlying Asset (Lastro)

This endpoint registers the underlying asset (lastro) of a CRI operation. The underlying asset represents the credit rights backing the securitization. The asset document is sent in base64 and its structured data accompanies the request.

info

The underlying asset is sent after the operation is created, in a separate request. Multiple underlying assets can be registered for the same operation.

---

Request

ENDPOINT

/cri/operation/OPERATION-KEY/underlying_asset

METHOD

POST

Path Params

Field	Type	Description	Characters
OPERATION-KEY *	string	Unique operation key (UUID v4).	36

---

Request Body

Request Body

{
    "underlying_asset_type": "contract",
    "underlying_asset_base64": "image_b64",
    "underlying_asset_data": {
        "contract_number": "12345",
        "debtor_document_number": "12.345.678/0001-90",
        "amount": 1075268.82,
        "due_date": "2026-01-20"
    }
}

Request Body Params

Field	Type	Description	Max Characters
underlying_asset_type *	string	Underlying asset type.	underlying_asset_type Enumerators
underlying_asset_base64 *	string	Underlying asset document in base64.	-
underlying_asset_data *	object	Underlying asset data (free-form).	-

underlying_asset_type Enumerators

Enum	Description
contract	Contract.

Response

STATUS

201

Response Body

{
    "underlying_asset_key": "5b1f9c2e-2a44-4f0e-9c0a-7b2e0d6f1a23",
    "underlying_asset_type": "contract",
    "underlying_asset_data": {
        "contract_number": "12345",
        "debtor_document_number": "12.345.678/0001-90",
        "amount": 1075268.82,
        "due_date": "2026-01-20"
    }
}

Response Body Params

Field	Type	Description
underlying_asset_key *	string	Unique key of the registered asset.
underlying_asset_type *	string	Underlying asset type.
underlying_asset_data *	object	Underlying asset data.

---