Shipping rates should not be calculated until quote is created as this may cause issues in 3rd party modules which expects all properties filled in rate request.

Author: Volodymyr Kublytskyi

app/code/Magento/InstantPurchase/Model/ShippingMethodChoose/CarrierFinder.php

@@ -0,0 +1,63 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\InstantPurchase\Model\ShippingMethodChoose;
+
+use Magento\Customer\Model\Address;
+use Magento\Framework\DataObject;
+use Magento\Shipping\Model\Config as CarriersConfig;
+use Magento\Store\Model\StoreManagerInterface;
+
+/**
+ * Collect shipping rates for customer address without packaging estiamtion.
+ */
+class CarrierFinder
+{
+    /**
+     * @var CarriersConfig
+     */
+    private $carriersConfig;
+
+    /**
+     * @var StoreManagerInterface
+     */
+    private $storeManager;
+
+    /**
+     * CarrierFinder constructor.
+     * @param CarriersConfig $carriersConfig
+     * @param StoreManagerInterface $storeManager
+     */
+    public function __construct(
+        CarriersConfig $carriersConfig,
+        StoreManagerInterface $storeManager
+    ) {
+        $this->carriersConfig = $carriersConfig;
+        $this->storeManager = $storeManager;
+    }
+
+    /**
+     * Finds carriers delivering to customer address
+     *
+     * @param Address $address
+     * @return array
+     */
+    public function getCarriersForCustomerAddress(Address $address): array
+    {
+        $request = new DataObject([
+            'dest_country_id' => $address->getCountryId()
+        ]);
+
+        $carriers = [];
+        foreach ($this->carriersConfig->getActiveCarriers($this->storeManager->getStore()->getId()) as $carrier) {
+            $checked = $carrier->checkAvailableShipCountries($request);
+            if (false !== $checked && null === $checked->getErrorMessage() && !empty($checked->getAllowedMethods())) {
+                $carriers[] = $checked;
+            }
+        }
+
+        return $carriers;
+    }
+}

app/code/Magento/InstantPurchase/Model/ShippingMethodChoose/CheapestMethodChooser.php

@@ -6,7 +6,6 @@
 namespace Magento\InstantPurchase\Model\ShippingMethodChoose;
 
 use Magento\Customer\Model\Address;
-use Magento\Quote\Api\Data\ShippingMethodInterface;
 use Magento\Quote\Api\Data\ShippingMethodInterfaceFactory;
 
 /**
@@ -20,21 +19,21 @@ class CheapestMethodChooser implements ShippingMethodChooserInterface
     private $shippingMethodFactory;
 
     /**
-     * @var ShippingRateFinder
+     * @var CarrierFinder
      */
-    private $shippingRateFinder;
+    private $carrierFinder;
 
     /**
      * CheapestMethodChooser constructor.
      * @param ShippingMethodInterfaceFactory $shippingMethodFactory
-     * @param ShippingRateFinder $shippingRateFinder
+     * @param CarrierFinder $carrierFinder
      */
     public function __construct(
         ShippingMethodInterfaceFactory $shippingMethodFactory,
-        ShippingRateFinder $shippingRateFinder
+        CarrierFinder $carrierFinder
     ) {
         $this->shippingMethodFactory = $shippingMethodFactory;
-        $this->shippingRateFinder = $shippingRateFinder;
+        $this->carrierFinder = $carrierFinder;
     }
 
     /**
@@ -58,7 +57,7 @@ public function choose(Address $address)
      */
     private function areShippingMethodsAvailable(Address $address): bool
     {
-        $shippingRatesForAddress = $this->shippingRateFinder->getRatesForCustomerAddress($address);
-        return !empty($shippingRatesForAddress);
+        $carriersForAddress = $this->carrierFinder->getCarriersForCustomerAddress($address);
+        return !empty($carriersForAddress);
     }
 }

app/code/Magento/InstantPurchase/Model/ShippingMethodChoose/ShippingRateFinder.php

@@ -13,6 +13,7 @@
     "magento/module-catalog": "102.0.*",
     "magento/module-customer": "101.0.*",
     "magento/module-sales": "101.0.*",
+    "magento/module-shipping": "100.2.*",
     "magento/module-quote": "101.0.*",
     "magento/module-vault": "101.0.*",
     "magento/framework": "100.2.*"