To Get a Current Guest Customer Quote with REST API, you need to follow give WebAPI to access it.
/V1/guest-carts/:cartId
Action: GET
URL: <WEBSITE_URL>/rest/<STORE_CODE>/V1/guest-carts/:cartId (Example: https://magento.test/rest/default/V1/guest-carts/fQtl1bxLdxud1fFEP68znOAPnAFFpjVh)
Payload: Empty
Response:
{
"id": 5,
"created_at": "2022-07-13 13:13:35",
"updated_at": "2022-07-13 13:13:35",
"is_active": true,
"is_virtual": false,
"items": [],
"items_count": 0,
"items_qty": 0,
"customer": {
"email": null,
"firstname": null,
"lastname": null
},
"billing_address": {
"id": 10,
"region": null,
"region_id": null,
"region_code": null,
"country_id": null,
"street": [
""
],
"telephone": null,
"postcode": null,
"city": null,
"firstname": null,
"lastname": null,
"email": null,
"same_as_billing": 0,
"save_in_address_book": 0
},
"orig_order_id": 0,
"currency": {
"global_currency_code": "EUR",
"base_currency_code": "EUR",
"store_currency_code": "EUR",
"quote_currency_code": "EUR",
"store_to_base_rate": 0,
"store_to_quote_rate": 0,
"base_to_global_rate": 1,
"base_to_quote_rate": 1
},
"customer_is_guest": true,
"customer_note_notify": true,
"customer_tax_class_id": 3,
"store_id": 2,
"extension_attributes": {
"shipping_assignments": []
}
}
The Response of the Guest Customer Quote will be guest details from the quote table.
You may also be interested in Guest Customer Place Order Flow by REST API Magento 2.