diff --git a/CHANGELOG.md b/CHANGELOG.md
index e8767b02..421318a4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Next Release
 
+- Adds new `shipment.recommendShipDate`, `smartrate.recommendShipDate`, and `smartrate.estimateDeliveryDate` functions
 - Routes `UpsAccount`, `UpsMailInnovationsAccount`, and `UpsSurepostAccount` create/update requests to the new `/ups_oauth_registrations` endpoint
   - Starting `2024-08-05`, UPS accounts will require a new payload to register or update. See [UPS OAuth 2.0 Update](https://support.easypost.com/hc/en-us/articles/26635027512717-UPS-OAuth-2-0-Update?utm_medium=email&_hsenc=p2ANqtz-96MmFtWICOzy9sKRbbcZSiMovZSrY3MSX1_bgY9N3f9yLVfWQdLhjAGq-SmNcOnDIS6GYhZ0OApjDBrGkKyLLMx1z6_TFOVp6-wllhEFQINrkuRuc&_hsmi=313130292&utm_content=313130292&utm_source=hs_email) for more details
 
diff --git a/lib/EasyPost/EasyPostClient.php b/lib/EasyPost/EasyPostClient.php
index 8cbc295f..35eb0d68 100644
--- a/lib/EasyPost/EasyPostClient.php
+++ b/lib/EasyPost/EasyPostClient.php
@@ -29,6 +29,7 @@
 use EasyPost\Service\ReportService;
 use EasyPost\Service\ScanFormService;
 use EasyPost\Service\ShipmentService;
+use EasyPost\Service\SmartRateService;
 use EasyPost\Service\TrackerService;
 use EasyPost\Service\UserService;
 use EasyPost\Service\WebhookService;
@@ -60,6 +61,7 @@
  * @property ReportService $report
  * @property ScanFormService $scanForm
  * @property ShipmentService $shipment
+ * @property SmartRateService $smartRate
  * @property TrackerService $tracker
  * @property UserService $user
  * @property WebhookService $webhook
@@ -131,6 +133,7 @@ public function __get(string $serviceName)
             'report' => ReportService::class,
             'scanForm' => ScanFormService::class,
             'shipment' => ShipmentService::class,
+            'smartRate' => SmartRateService::class,
             'tracker' => TrackerService::class,
             'user' => UserService::class,
             'webhook' => WebhookService::class,
diff --git a/lib/EasyPost/Service/ShipmentService.php b/lib/EasyPost/Service/ShipmentService.php
index ebc5bab3..fa37d00b 100644
--- a/lib/EasyPost/Service/ShipmentService.php
+++ b/lib/EasyPost/Service/ShipmentService.php
@@ -234,4 +234,24 @@ public function retrieveEstimatedDeliveryDate(string $id, string $plannedShipDat
 
         return InternalUtil::convertToEasyPostObject($this->client, $response['rates'] ?? []);
     }
+
+    /**
+     * Retrieve a recommended ship date for an existing Shipment via the Precision Shipping API,
+     * based on a specific desired delivery date.
+     *
+     * @param string $id
+     * @param string $desiredDeliveryDate
+     * @return mixed
+     */
+    public function recommendShipDate(string $id, string $desiredDeliveryDate): mixed
+    {
+        $params = [
+            'desired_delivery_date' => $desiredDeliveryDate,
+        ];
+
+        $url = $this->instanceUrl(self::serviceModelClassName(self::class), $id) . '/smartrate/precision_shipping';
+        $response = Requestor::request($this->client, 'get', $url, $params);
+
+        return InternalUtil::convertToEasyPostObject($this->client, $response['rates'] ?? []);
+    }
 }
diff --git a/lib/EasyPost/Service/SmartRateService.php b/lib/EasyPost/Service/SmartRateService.php
new file mode 100644
index 00000000..8ee394a7
--- /dev/null
+++ b/lib/EasyPost/Service/SmartRateService.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace EasyPost\Service;
+
+use EasyPost\Exception\General\EndOfPaginationException;
+use EasyPost\Http\Requestor;
+use EasyPost\Util\InternalUtil;
+
+/**
+ * SmartRate service containing all the details of SmartRate requests.
+ */
+class SmartRateService extends BaseService
+{
+    /**
+     * Retrieve a recommended ship date for each carrier-service level combination via the
+     * Smart Deliver On API, based on a specific delivery date and origin-destination postal code pair.
+     *
+     * @param mixed $params
+     * @return mixed
+     */
+    public function recommendShipDate(mixed $params = null): mixed
+    {
+        $response = Requestor::request($this->client, 'post', '/smartrate/deliver_on', $params);
+
+        return InternalUtil::convertToEasyPostObject($this->client, $response);
+    }
+
+    /**
+     * Retrieve the estimated delivery date of each carrier-service level combination via the
+     * Smart Deliver By API, based on a specific ship date and origin-destination postal code pair.
+     *
+     * @param mixed $params
+     * @return mixed
+     */
+    public function estimateDeliveryDate(mixed $params = null): mixed
+    {
+        $response = Requestor::request($this->client, 'post', '/smartrate/deliver_by', $params);
+
+        return InternalUtil::convertToEasyPostObject($this->client, $response);
+    }
+}
diff --git a/lib/easypost.php b/lib/easypost.php
index e10bb736..772276d6 100644
--- a/lib/easypost.php
+++ b/lib/easypost.php
@@ -110,6 +110,7 @@
 require_once(dirname(__FILE__) . '/EasyPost/Service/ReportService.php');
 require_once(dirname(__FILE__) . '/EasyPost/Service/ScanFormService.php');
 require_once(dirname(__FILE__) . '/EasyPost/Service/ShipmentService.php');
+require_once(dirname(__FILE__) . '/EasyPost/Service/SmartRateService.php');
 require_once(dirname(__FILE__) . '/EasyPost/Service/TrackerService.php');
 require_once(dirname(__FILE__) . '/EasyPost/Service/UserService.php');
 require_once(dirname(__FILE__) . '/EasyPost/Service/WebhookService.php');
diff --git a/test/EasyPost/Fixture.php b/test/EasyPost/Fixture.php
index fbc4921f..c30300da 100644
--- a/test/EasyPost/Fixture.php
+++ b/test/EasyPost/Fixture.php
@@ -231,6 +231,11 @@ public static function rmaFormOtions(): array
 
     public static function plannedShipDate(): string
     {
-        return '2023-11-24';
+        return '2024-07-16';
+    }
+
+    public static function desiredDeliveryDate(): string
+    {
+        return '2024-07-16';
     }
 }
diff --git a/test/EasyPost/ShipmentTest.php b/test/EasyPost/ShipmentTest.php
index 6601274d..b68e534e 100644
--- a/test/EasyPost/ShipmentTest.php
+++ b/test/EasyPost/ShipmentTest.php
@@ -516,4 +516,23 @@ public function testRetrieveEstimatedDeliveryDate(): void
             $this->assertNotNull($entry->easypost_time_in_transit_data);
         }
     }
+
+    /**
+     * Tests that we retrieve the recommend ship date of a Shipment.
+     */
+    public function testRetrieveRecommendDate(): void
+    {
+        TestUtil::setupCassette('shipments/recommendShipDate.yml');
+
+        $shipment = self::$client->shipment->create(Fixture::basicShipment());
+
+        $rates = self::$client->shipment->recommendShipDate(
+            $shipment->id,
+            Fixture::desiredDeliveryDate(),
+        );
+
+        foreach ($rates as $entry) {
+            $this->assertNotNull($entry->easypost_time_in_transit_data);
+        }
+    }
 }
diff --git a/test/EasyPost/SmartRateTest.php b/test/EasyPost/SmartRateTest.php
new file mode 100644
index 00000000..adc63d56
--- /dev/null
+++ b/test/EasyPost/SmartRateTest.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace EasyPost\Test;
+
+use EasyPost\EasyPostClient;
+use EasyPost\Exception\General\EndOfPaginationException;
+use Exception;
+
+class SmartRateTest extends \PHPUnit\Framework\TestCase
+{
+    private static EasyPostClient $client;
+
+    /**
+     * Setup the testing environment for this file.
+     */
+    public static function setUpBeforeClass(): void
+    {
+        TestUtil::setupVcrTests();
+        self::$client = new EasyPostClient(getenv('EASYPOST_TEST_API_KEY'));
+    }
+
+    /**
+     * Cleanup the testing environment once finished.
+     */
+    public static function tearDownAfterClass(): void
+    {
+        TestUtil::teardownVcrTests();
+    }
+
+    /**
+     * Test that we retrieve SmartRates when provided a from/to zip and planned ship date.
+     */
+    public function testRetrieveRecommendDate(): void
+    {
+        TestUtil::setupCassette('smartrate/recommendShipDate.yml');
+
+        $params = [
+            'from_zip' => Fixture::caAddress1()['zip'],
+            'to_zip' => Fixture::caAddress2()['zip'],
+            'desired_delivery_date' => Fixture::desiredDeliveryDate(),
+            'carriers' => [Fixture::usps()],
+        ];
+
+        $rates = self::$client->smartRate->recommendShipDate($params);
+
+        foreach ($rates['results'] as $entry) {
+            $this->assertTrue(
+                isset($entry['easypost_time_in_transit_data']),
+                'Assertion failed: easypost_time_in_transit_data is not set.'
+            );
+        }
+    }
+
+    /**
+     * Test that we retrieve SmartRates when provided a from/to zip and planned ship date.
+     */
+    public function testRetrieveEstimatedDeliveryDate(): void
+    {
+        TestUtil::setupCassette('smartrate/estimatedDeliveryDate.yml');
+
+        $params = [
+            'from_zip' => Fixture::caAddress1()['zip'],
+            'to_zip' => Fixture::caAddress2()['zip'],
+            'planned_ship_date' => Fixture::plannedShipDate(),
+            'carriers' => [Fixture::usps()],
+        ];
+
+        $rates = self::$client->smartRate->estimateDeliveryDate($params);
+
+        foreach ($rates['results'] as $entry) {
+            $this->assertTrue(
+                isset($entry['easypost_time_in_transit_data']),
+                'Assertion failed: easypost_time_in_transit_data is not set.'
+            );
+        }
+    }
+}
diff --git a/test/cassettes/shipments/recommendShipDate.yml b/test/cassettes/shipments/recommendShipDate.yml
new file mode 100644
index 00000000..afc73de9
--- /dev/null
+++ b/test/cassettes/shipments/recommendShipDate.yml
@@ -0,0 +1,160 @@
+
+-
+    request:
+        method: POST
+        url: 'https://api.easypost.com/v2/shipments'
+        headers:
+            Host: api.easypost.com
+            Expect: ''
+            Accept-Encoding: ''
+            Accept: application/json
+            Authorization: ''
+            Content-Type: application/json
+            User-Agent: ''
+        body: '{"shipment":{"from_address":{"name":"Jack Sparrow","street1":"388 Townsend St","street2":"Apt 20","city":"San Francisco","state":"CA","zip":"94107","country":"US","email":"test@example.com","phone":"5555555555"},"to_address":{"name":"Elizabeth Swan","street1":"179 N Harbor Dr","city":"Redondo Beach","state":"CA","zip":"90277","country":"US","email":"test@example.com","phone":"5555555555"},"parcel":{"length":"10","width":"8","height":"4","weight":"15.4"}}}'
+    response:
+        status:
+            code: 201
+            message: Created
+        headers:
+            x-frame-options: SAMEORIGIN
+            x-xss-protection: '1; mode=block'
+            x-content-type-options: nosniff
+            x-download-options: noopen
+            x-permitted-cross-domain-policies: none
+            referrer-policy: strict-origin-when-cross-origin
+            x-ep-request-uuid: b8e53c20669041f6e798cd230027aa64
+            cache-control: 'private, no-cache, no-store'
+            pragma: no-cache
+            expires: '0'
+            location: /api/v2/shipments/shp_449052bb390640bea509210fef92eb0a
+            content-type: 'application/json; charset=utf-8'
+            content-length: '6335'
+            x-runtime: '0.768374'
+            x-node: bigweb32nuq
+            x-version-label: easypost-202407111940-3cb16a3462-master
+            x-backend: easypost
+            x-canary: direct
+            x-proxied: ['intlb3nuq fa152d4755', 'extlb2nuq fa152d4755']
+            strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
+        body: '{"created_at":"2024-07-11T20:35:02Z","is_return":false,"messages":[{"carrier":"UPS","carrier_account_id":"ca_533ac39596fc45809cf6685bbe55523a","type":"rate_error","message":"Invalid Access License number"},{"carrier":"UPS","carrier_account_id":"ca_d05aecc4f5c9412283e2fdc65d117692","type":"rate_error","message":"Invalid Access License number"},{"carrier":"DhlEcs","carrier_account_id":"ca_b3781a40f76d4b94a70d2258e6d318c2","type":"rate_error","message":"Invalid credentials"},{"carrier":"DhlEcs","carrier_account_id":"ca_91ae96a5fc1f4cf4aa4b69067df5686b","type":"rate_error","message":"Invalid credentials"},{"carrier":"DhlEcs","carrier_account_id":"ca_c02da7bfb4264ea3bcb85c0f760d4a6e","type":"rate_error","message":"Invalid credentials"},{"carrier":"DhlEcs","carrier_account_id":"ca_b437adf5f4c64f3d8823d5ffa776a158","type":"rate_error","message":"Invalid credentials"},{"carrier":"DhlEcs","carrier_account_id":"ca_e94e4fa45aba4058809c9246a48712b3","type":"rate_error","message":"Invalid credentials"}],"mode":"test","options":{"currency":"USD","payment":{"type":"SENDER"},"date_advance":0},"reference":null,"status":"unknown","tracking_code":null,"updated_at":"2024-07-11T20:35:03Z","batch_id":null,"batch_status":null,"batch_message":null,"customs_info":null,"from_address":{"id":"adr_0cb085bd3fc511ef9f4dac1f6bc539aa","object":"Address","created_at":"2024-07-11T20:35:02+00:00","updated_at":"2024-07-11T20:35:02+00:00","name":"Jack Sparrow","company":null,"street1":"388 Townsend St","street2":"Apt 20","city":"San Francisco","state":"CA","zip":"94107","country":"US","phone":"<REDACTED>","email":"<REDACTED>","mode":"test","carrier_facility":null,"residential":null,"federal_tax_id":null,"state_tax_id":null,"verifications":[]},"insurance":null,"order_id":null,"parcel":{"id":"prcl_80c59c7121cf452d89e202b242dea88b","object":"Parcel","created_at":"2024-07-11T20:35:02Z","updated_at":"2024-07-11T20:35:02Z","length":10,"width":8,"height":4,"predefined_package":null,"weight":15.4,"mode":"test"},"postage_label":null,"rates":[{"id":"rate_1c86295b13b644e5a0ecb14312c545e1","object":"Rate","created_at":"2024-07-11T20:35:03Z","updated_at":"2024-07-11T20:35:03Z","mode":"test","service":"Priority","carrier":"USPS","rate":"6.90","currency":"USD","retail_rate":"9.80","retail_currency":"USD","list_rate":"8.25","list_currency":"USD","billing_type":"easypost","delivery_days":2,"delivery_date":null,"delivery_date_guaranteed":false,"est_delivery_days":2,"shipment_id":"shp_449052bb390640bea509210fef92eb0a","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b"},{"id":"rate_4f7d526d65724547b72a61caa9730821","object":"Rate","created_at":"2024-07-11T20:35:03Z","updated_at":"2024-07-11T20:35:03Z","mode":"test","service":"GroundAdvantage","carrier":"USPS","rate":"5.93","currency":"USD","retail_rate":"8.45","retail_currency":"USD","list_rate":"6.40","list_currency":"USD","billing_type":"easypost","delivery_days":3,"delivery_date":null,"delivery_date_guaranteed":false,"est_delivery_days":3,"shipment_id":"shp_449052bb390640bea509210fef92eb0a","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b"},{"id":"rate_e57c56562118427f8811fa941ddaf42a","object":"Rate","created_at":"2024-07-11T20:35:03Z","updated_at":"2024-07-11T20:35:03Z","mode":"test","service":"First","carrier":"USPS","rate":"5.93","currency":"USD","retail_rate":"8.45","retail_currency":"USD","list_rate":"6.40","list_currency":"USD","billing_type":"easypost","delivery_days":3,"delivery_date":null,"delivery_date_guaranteed":false,"est_delivery_days":3,"shipment_id":"shp_449052bb390640bea509210fef92eb0a","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b"},{"id":"rate_ee7e69da162948a0909520923cb360d1","object":"Rate","created_at":"2024-07-11T20:35:03Z","updated_at":"2024-07-11T20:35:03Z","mode":"test","service":"ParcelSelect","carrier":"USPS","rate":"5.93","currency":"USD","retail_rate":"8.45","retail_currency":"USD","list_rate":"6.40","list_currency":"USD","billing_type":"easypost","delivery_days":3,"delivery_date":null,"delivery_date_guaranteed":false,"est_delivery_days":3,"shipment_id":"shp_449052bb390640bea509210fef92eb0a","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b"},{"id":"rate_9a6737cb2e8f486db5546be3e1632cf4","object":"Rate","created_at":"2024-07-11T20:35:03Z","updated_at":"2024-07-11T20:35:03Z","mode":"test","service":"Express","carrier":"USPS","rate":"33.10","currency":"USD","retail_rate":"37.90","retail_currency":"USD","list_rate":"33.10","list_currency":"USD","billing_type":"easypost","delivery_days":2,"delivery_date":null,"delivery_date_guaranteed":false,"est_delivery_days":2,"shipment_id":"shp_449052bb390640bea509210fef92eb0a","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b"}],"refund_status":null,"scan_form":null,"selected_rate":null,"tracker":null,"to_address":{"id":"adr_0cad956d3fc511efacb1ac1f6bc53342","object":"Address","created_at":"2024-07-11T20:35:02+00:00","updated_at":"2024-07-11T20:35:02+00:00","name":"Elizabeth Swan","company":null,"street1":"179 N Harbor Dr","street2":null,"city":"Redondo Beach","state":"CA","zip":"90277","country":"US","phone":"<REDACTED>","email":"<REDACTED>","mode":"test","carrier_facility":null,"residential":null,"federal_tax_id":null,"state_tax_id":null,"verifications":[]},"usps_zone":4,"return_address":{"id":"adr_0cb085bd3fc511ef9f4dac1f6bc539aa","object":"Address","created_at":"2024-07-11T20:35:02+00:00","updated_at":"2024-07-11T20:35:02+00:00","name":"Jack Sparrow","company":null,"street1":"388 Townsend St","street2":"Apt 20","city":"San Francisco","state":"CA","zip":"94107","country":"US","phone":"<REDACTED>","email":"<REDACTED>","mode":"test","carrier_facility":null,"residential":null,"federal_tax_id":null,"state_tax_id":null,"verifications":[]},"buyer_address":{"id":"adr_0cad956d3fc511efacb1ac1f6bc53342","object":"Address","created_at":"2024-07-11T20:35:02+00:00","updated_at":"2024-07-11T20:35:02+00:00","name":"Elizabeth Swan","company":null,"street1":"179 N Harbor Dr","street2":null,"city":"Redondo Beach","state":"CA","zip":"90277","country":"US","phone":"<REDACTED>","email":"<REDACTED>","mode":"test","carrier_facility":null,"residential":null,"federal_tax_id":null,"state_tax_id":null,"verifications":[]},"forms":[],"fees":[],"id":"shp_449052bb390640bea509210fef92eb0a","object":"Shipment"}'
+        curl_info:
+            url: 'https://api.easypost.com/v2/shipments'
+            content_type: 'application/json; charset=utf-8'
+            http_code: 201
+            header_size: 778
+            request_size: 767
+            filetime: -1
+            ssl_verify_result: 0
+            redirect_count: 0
+            total_time: 1.195488
+            namelookup_time: 0.002895
+            connect_time: 0.151394
+            pretransfer_time: 0.291628
+            size_upload: 459.0
+            size_download: 6335.0
+            speed_download: 5299.0
+            speed_upload: 383.0
+            download_content_length: 6335.0
+            upload_content_length: 459.0
+            starttransfer_time: 1.19544
+            redirect_time: 0.0
+            redirect_url: ''
+            primary_ip: 169.62.110.130
+            certinfo: {  }
+            primary_port: 443
+            local_ip: 10.130.6.29
+            local_port: 60484
+            http_version: 2
+            protocol: 2
+            ssl_verifyresult: 0
+            scheme: HTTPS
+            appconnect_time_us: 291551
+            connect_time_us: 151394
+            namelookup_time_us: 2895
+            pretransfer_time_us: 291628
+            redirect_time_us: 0
+            starttransfer_time_us: 1195440
+            total_time_us: 1195488
+            effective_method: POST
+            capath: ''
+            cainfo: ''
+    index: 0
+-
+    request:
+        method: GET
+        url: 'https://api.easypost.com/v2/shipments/shp_449052bb390640bea509210fef92eb0a/smartrate/precision_shipping?desired_delivery_date=2024-07-16'
+        headers:
+            Host: api.easypost.com
+            Accept-Encoding: ''
+            Accept: application/json
+            Authorization: ''
+            Content-Type: application/json
+            User-Agent: ''
+    response:
+        status:
+            code: 200
+            message: OK
+        headers:
+            x-frame-options: SAMEORIGIN
+            x-xss-protection: '1; mode=block'
+            x-content-type-options: nosniff
+            x-download-options: noopen
+            x-permitted-cross-domain-policies: none
+            referrer-policy: strict-origin-when-cross-origin
+            x-ep-request-uuid: b8e53c22669041f7e798cd400027ac0e
+            cache-control: 'private, no-cache, no-store'
+            pragma: no-cache
+            expires: '0'
+            content-type: 'application/json; charset=utf-8'
+            content-length: '4098'
+            x-runtime: '0.132513'
+            x-node: bigweb43nuq
+            x-version-label: easypost-202407111940-3cb16a3462-master
+            x-backend: easypost
+            x-canary: direct
+            x-proxied: ['intlb4nuq fa152d4755', 'extlb2nuq fa152d4755']
+            strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
+        body: '{"rates":[{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":3,"percentile_85":4,"percentile_90":4,"percentile_95":5,"percentile_97":5,"percentile_99":7},"delivery_date_confidence":0.19,"desired_delivery_date":"2024-07-16","estimated_transit_days":3,"ship_on_date":"2024-07-13"},"rate":{"carrier":"USPS","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b","created_at":"2024-07-11T20:35:03Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":2,"est_delivery_days":2,"id":"rate_1c86295b13b644e5a0ecb14312c545e1","list_currency":"USD","list_rate":8.25,"mode":"test","object":"Rate","rate":6.9,"retail_currency":"USD","retail_rate":9.8,"service":"Priority","shipment_id":"shp_449052bb390640bea509210fef92eb0a","updated_at":"2024-07-11T20:35:03Z"}},{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":3,"percentile_85":4,"percentile_90":4,"percentile_95":5,"percentile_97":5,"percentile_99":9},"delivery_date_confidence":0.21,"desired_delivery_date":"2024-07-16","estimated_transit_days":3,"ship_on_date":"2024-07-13"},"rate":{"carrier":"USPS","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b","created_at":"2024-07-11T20:35:03Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":3,"est_delivery_days":3,"id":"rate_4f7d526d65724547b72a61caa9730821","list_currency":"USD","list_rate":6.4,"mode":"test","object":"Rate","rate":5.93,"retail_currency":"USD","retail_rate":8.45,"service":"GroundAdvantage","shipment_id":"shp_449052bb390640bea509210fef92eb0a","updated_at":"2024-07-11T20:35:03Z"}},{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":3,"percentile_85":4,"percentile_90":4,"percentile_95":5,"percentile_97":5,"percentile_99":9},"delivery_date_confidence":0.21,"desired_delivery_date":"2024-07-16","estimated_transit_days":3,"ship_on_date":"2024-07-13"},"rate":{"carrier":"USPS","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b","created_at":"2024-07-11T20:35:03Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":3,"est_delivery_days":3,"id":"rate_e57c56562118427f8811fa941ddaf42a","list_currency":"USD","list_rate":6.4,"mode":"test","object":"Rate","rate":5.93,"retail_currency":"USD","retail_rate":8.45,"service":"First","shipment_id":"shp_449052bb390640bea509210fef92eb0a","updated_at":"2024-07-11T20:35:03Z"}},{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":3,"percentile_85":4,"percentile_90":4,"percentile_95":5,"percentile_97":5,"percentile_99":9},"delivery_date_confidence":0.21,"desired_delivery_date":"2024-07-16","estimated_transit_days":3,"ship_on_date":"2024-07-13"},"rate":{"carrier":"USPS","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b","created_at":"2024-07-11T20:35:03Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":3,"est_delivery_days":3,"id":"rate_ee7e69da162948a0909520923cb360d1","list_currency":"USD","list_rate":6.4,"mode":"test","object":"Rate","rate":5.93,"retail_currency":"USD","retail_rate":8.45,"service":"ParcelSelect","shipment_id":"shp_449052bb390640bea509210fef92eb0a","updated_at":"2024-07-11T20:35:03Z"}},{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":2,"percentile_85":2,"percentile_90":3,"percentile_95":3,"percentile_97":4,"percentile_99":7},"delivery_date_confidence":0.47,"desired_delivery_date":"2024-07-16","estimated_transit_days":1,"ship_on_date":"2024-07-15"},"rate":{"carrier":"USPS","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b","created_at":"2024-07-11T20:35:03Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":2,"est_delivery_days":2,"id":"rate_9a6737cb2e8f486db5546be3e1632cf4","list_currency":"USD","list_rate":33.1,"mode":"test","object":"Rate","rate":33.1,"retail_currency":"USD","retail_rate":37.9,"service":"Express","shipment_id":"shp_449052bb390640bea509210fef92eb0a","updated_at":"2024-07-11T20:35:03Z"}}]}'
+        curl_info:
+            url: 'https://api.easypost.com/v2/shipments/shp_449052bb390640bea509210fef92eb0a/smartrate/precision_shipping?desired_delivery_date=2024-07-16'
+            content_type: 'application/json; charset=utf-8'
+            http_code: 200
+            header_size: 707
+            request_size: 385
+            filetime: -1
+            ssl_verify_result: 0
+            redirect_count: 0
+            total_time: 0.539185
+            namelookup_time: 0.001221
+            connect_time: 0.136901
+            pretransfer_time: 0.262583
+            size_upload: 0.0
+            size_download: 4098.0
+            speed_download: 7600.0
+            speed_upload: 0.0
+            download_content_length: 4098.0
+            upload_content_length: 0.0
+            starttransfer_time: 0.53711
+            redirect_time: 0.0
+            redirect_url: ''
+            primary_ip: 169.62.110.130
+            certinfo: {  }
+            primary_port: 443
+            local_ip: 10.130.6.29
+            local_port: 60490
+            http_version: 2
+            protocol: 2
+            ssl_verifyresult: 0
+            scheme: HTTPS
+            appconnect_time_us: 262522
+            connect_time_us: 136901
+            namelookup_time_us: 1221
+            pretransfer_time_us: 262583
+            redirect_time_us: 0
+            starttransfer_time_us: 537110
+            total_time_us: 539185
+            effective_method: GET
+            capath: ''
+            cainfo: ''
+    index: 0
diff --git a/test/cassettes/shipments/retrieveEstimatedDeliveryDate.yml b/test/cassettes/shipments/retrieveEstimatedDeliveryDate.yml
index ebd1c928..bacdcec1 100644
--- a/test/cassettes/shipments/retrieveEstimatedDeliveryDate.yml
+++ b/test/cassettes/shipments/retrieveEstimatedDeliveryDate.yml
@@ -14,8 +14,7 @@
         body: '{"shipment":{"from_address":{"name":"Jack Sparrow","street1":"388 Townsend St","street2":"Apt 20","city":"San Francisco","state":"CA","zip":"94107","country":"US","email":"test@example.com","phone":"5555555555"},"to_address":{"name":"Elizabeth Swan","street1":"179 N Harbor Dr","city":"Redondo Beach","state":"CA","zip":"90277","country":"US","email":"test@example.com","phone":"5555555555"},"parcel":{"length":"10","width":"8","height":"4","weight":"15.4"}}}'
     response:
         status:
-            http_version: '1.1'
-            code: '201'
+            code: 201
             message: Created
         headers:
             x-frame-options: SAMEORIGIN
@@ -24,20 +23,20 @@
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             x-permitted-cross-domain-policies: none
             referrer-policy: strict-origin-when-cross-origin
-            x-ep-request-uuid: 71ef911d655e66e6e78861a70021bace
+            x-ep-request-uuid: b8e53c1e669041e4e798cc1d002795bd
             cache-control: 'private, no-cache, no-store'
             pragma: no-cache
             expires: '0'
-            location: /api/v2/shipments/shp_097bd5085ef74deeb2a8914311215c7a
+            location: /api/v2/shipments/shp_788aa30b53e04545b4f416af4425c5cd
             content-type: 'application/json; charset=utf-8'
-            content-length: '6229'
-            x-runtime: '1.040287'
-            x-node: bigweb33nuq
-            x-version-label: easypost-202311212221-a0f06fbc2c-master
+            content-length: '6335'
+            x-runtime: '1.532754'
+            x-node: bigweb41nuq
+            x-version-label: easypost-202407111940-3cb16a3462-master
             x-backend: easypost
-            x-proxied: ['intlb2nuq b3de2c47ef', 'extlb2nuq 003ad9bca0']
+            x-proxied: ['intlb4nuq fa152d4755', 'extlb2nuq fa152d4755']
             strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
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         curl_info:
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@@ -47,40 +46,43 @@
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             redirect_count: 0
-            total_time: 1.27355
-            namelookup_time: 0.029998
-            connect_time: 0.095506
-            pretransfer_time: 0.167186
+            total_time: 2.017483
+            namelookup_time: 0.00294
+            connect_time: 0.141606
+            pretransfer_time: 0.275798
             size_upload: 459.0
-            size_download: 6229.0
-            speed_download: 4891.0
-            speed_upload: 360.0
-            download_content_length: 6229.0
+            size_download: 6335.0
+            speed_download: 3140.0
+            speed_upload: 227.0
+            download_content_length: 6335.0
             upload_content_length: 459.0
-            starttransfer_time: 1.273523
+            starttransfer_time: 2.017423
             redirect_time: 0.0
             redirect_url: ''
             primary_ip: 169.62.110.130
             certinfo: {  }
             primary_port: 443
-            local_ip: 10.130.6.39
-            local_port: 53639
+            local_ip: 10.130.6.29
+            local_port: 60406
             http_version: 2
             protocol: 2
             ssl_verifyresult: 0
             scheme: HTTPS
-            appconnect_time_us: 166931
-            connect_time_us: 95506
-            namelookup_time_us: 29998
-            pretransfer_time_us: 167186
+            appconnect_time_us: 275706
+            connect_time_us: 141606
+            namelookup_time_us: 2940
+            pretransfer_time_us: 275798
             redirect_time_us: 0
-            starttransfer_time_us: 1273523
-            total_time_us: 1273550
+            starttransfer_time_us: 2017423
+            total_time_us: 2017483
+            effective_method: POST
+            capath: ''
+            cainfo: ''
     index: 0
 -
     request:
         method: GET
-        url: 'https://api.easypost.com/v2/shipments/shp_097bd5085ef74deeb2a8914311215c7a/smartrate/delivery_date?planned_ship_date=2023-11-24'
+        url: 'https://api.easypost.com/v2/shipments/shp_788aa30b53e04545b4f416af4425c5cd/smartrate/delivery_date?planned_ship_date=2024-07-16'
         headers:
             Host: api.easypost.com
             Accept-Encoding: ''
@@ -90,8 +92,7 @@
             User-Agent: ''
     response:
         status:
-            http_version: '1.1'
-            code: '200'
+            code: 200
             message: OK
         headers:
             x-frame-options: SAMEORIGIN
@@ -100,56 +101,58 @@
             x-download-options: noopen
             x-permitted-cross-domain-policies: none
             referrer-policy: strict-origin-when-cross-origin
-            x-ep-request-uuid: 71ef911f655e66e8e78861bf0021bbd7
+            x-ep-request-uuid: b8e53c23669041e6e798cc3d0027980a
             cache-control: 'private, no-cache, no-store'
             pragma: no-cache
             expires: '0'
             content-type: 'application/json; charset=utf-8'
-            content-length: '3893'
-            x-runtime: '0.168070'
-            x-node: bigweb32nuq
-            x-version-label: easypost-202311212221-a0f06fbc2c-master
+            content-length: '3883'
+            x-runtime: '0.108990'
+            x-node: bigweb39nuq
+            x-version-label: easypost-202407111940-3cb16a3462-master
             x-backend: easypost
-            x-canary: direct
-            x-proxied: ['intlb2nuq b3de2c47ef', 'extlb2nuq 003ad9bca0']
+            x-proxied: ['intlb3nuq fa152d4755', 'extlb2nuq fa152d4755']
             strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
-        body: '{"rates":[{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":3,"percentile_75":3,"percentile_85":3,"percentile_90":3,"percentile_95":4,"percentile_97":4,"percentile_99":5},"easypost_estimated_delivery_date":"2023-11-27","planned_ship_date":"2023-11-24"},"rate":{"carrier":"USPS","carrier_account_id":"ca_8dc116debcdb49b5a66a2ddee4612600","created_at":"2023-11-22T20:39:03Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":null,"est_delivery_days":null,"id":"rate_552cb073b62e4e96897cda4ba9dd474c","list_currency":"USD","list_rate":31.25,"mode":"test","object":"Rate","rate":31.25,"retail_currency":"USD","retail_rate":35.8,"service":"Express","shipment_id":"shp_097bd5085ef74deeb2a8914311215c7a","updated_at":"2023-11-22T20:39:03Z"}},{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":3,"percentile_75":3,"percentile_85":3,"percentile_90":3,"percentile_95":3,"percentile_97":4,"percentile_99":5},"easypost_estimated_delivery_date":"2023-11-27","planned_ship_date":"2023-11-24"},"rate":{"carrier":"USPS","carrier_account_id":"ca_8dc116debcdb49b5a66a2ddee4612600","created_at":"2023-11-22T20:39:03Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":2,"est_delivery_days":2,"id":"rate_3cc6ca52721e401d94ad16c19610e786","list_currency":"USD","list_rate":8.24,"mode":"test","object":"Rate","rate":6.95,"retail_currency":"USD","retail_rate":10.2,"service":"Priority","shipment_id":"shp_097bd5085ef74deeb2a8914311215c7a","updated_at":"2023-11-22T20:39:03Z"}},{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":3,"percentile_75":3,"percentile_85":3,"percentile_90":3,"percentile_95":3,"percentile_97":4,"percentile_99":6},"easypost_estimated_delivery_date":"2023-11-27","planned_ship_date":"2023-11-24"},"rate":{"carrier":"USPS","carrier_account_id":"ca_8dc116debcdb49b5a66a2ddee4612600","created_at":"2023-11-22T20:39:03Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":3,"est_delivery_days":3,"id":"rate_eb81455a063343e88f400ca44bda630e","list_currency":"USD","list_rate":6.07,"mode":"test","object":"Rate","rate":5.93,"retail_currency":"USD","retail_rate":8,"service":"GroundAdvantage","shipment_id":"shp_097bd5085ef74deeb2a8914311215c7a","updated_at":"2023-11-22T20:39:03Z"}},{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":3,"percentile_75":3,"percentile_85":3,"percentile_90":3,"percentile_95":3,"percentile_97":4,"percentile_99":6},"easypost_estimated_delivery_date":"2023-11-27","planned_ship_date":"2023-11-24"},"rate":{"carrier":"USPS","carrier_account_id":"ca_8dc116debcdb49b5a66a2ddee4612600","created_at":"2023-11-22T20:39:03Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":3,"est_delivery_days":3,"id":"rate_3e4257d201224a16aa6063a8312266a5","list_currency":"USD","list_rate":6.07,"mode":"test","object":"Rate","rate":5.93,"retail_currency":"USD","retail_rate":8,"service":"First","shipment_id":"shp_097bd5085ef74deeb2a8914311215c7a","updated_at":"2023-11-22T20:39:03Z"}},{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":3,"percentile_75":3,"percentile_85":3,"percentile_90":3,"percentile_95":3,"percentile_97":4,"percentile_99":6},"easypost_estimated_delivery_date":"2023-11-27","planned_ship_date":"2023-11-24"},"rate":{"carrier":"USPS","carrier_account_id":"ca_8dc116debcdb49b5a66a2ddee4612600","created_at":"2023-11-22T20:39:03Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":3,"est_delivery_days":3,"id":"rate_43dda47b6bf84c28a60e25009dca351c","list_currency":"USD","list_rate":6.07,"mode":"test","object":"Rate","rate":5.93,"retail_currency":"USD","retail_rate":8,"service":"ParcelSelect","shipment_id":"shp_097bd5085ef74deeb2a8914311215c7a","updated_at":"2023-11-22T20:39:03Z"}}]}'
+        body: '{"rates":[{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":1,"percentile_75":2,"percentile_85":2,"percentile_90":3,"percentile_95":3,"percentile_97":4,"percentile_99":6},"easypost_estimated_delivery_date":"2024-07-17","planned_ship_date":"2024-07-16"},"rate":{"carrier":"USPS","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b","created_at":"2024-07-11T20:34:45Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":2,"est_delivery_days":2,"id":"rate_3a1bf63590db49f0968fe801aa6326d8","list_currency":"USD","list_rate":33.1,"mode":"test","object":"Rate","rate":33.1,"retail_currency":"USD","retail_rate":37.9,"service":"Express","shipment_id":"shp_788aa30b53e04545b4f416af4425c5cd","updated_at":"2024-07-11T20:34:45Z"}},{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":3,"percentile_85":3,"percentile_90":3,"percentile_95":4,"percentile_97":6,"percentile_99":7},"easypost_estimated_delivery_date":"2024-07-18","planned_ship_date":"2024-07-16"},"rate":{"carrier":"USPS","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b","created_at":"2024-07-11T20:34:45Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":2,"est_delivery_days":2,"id":"rate_cbfc5676bd4d40fc86ac1dba2d97f73b","list_currency":"USD","list_rate":8.25,"mode":"test","object":"Rate","rate":6.9,"retail_currency":"USD","retail_rate":9.8,"service":"Priority","shipment_id":"shp_788aa30b53e04545b4f416af4425c5cd","updated_at":"2024-07-11T20:34:45Z"}},{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":3,"percentile_85":3,"percentile_90":4,"percentile_95":6,"percentile_97":6,"percentile_99":9},"easypost_estimated_delivery_date":"2024-07-18","planned_ship_date":"2024-07-16"},"rate":{"carrier":"USPS","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b","created_at":"2024-07-11T20:34:45Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":3,"est_delivery_days":3,"id":"rate_c60caf762e754ae5b0ed7b93e9eee607","list_currency":"USD","list_rate":6.4,"mode":"test","object":"Rate","rate":5.93,"retail_currency":"USD","retail_rate":8.45,"service":"GroundAdvantage","shipment_id":"shp_788aa30b53e04545b4f416af4425c5cd","updated_at":"2024-07-11T20:34:45Z"}},{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":3,"percentile_85":3,"percentile_90":4,"percentile_95":6,"percentile_97":6,"percentile_99":9},"easypost_estimated_delivery_date":"2024-07-18","planned_ship_date":"2024-07-16"},"rate":{"carrier":"USPS","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b","created_at":"2024-07-11T20:34:45Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":3,"est_delivery_days":3,"id":"rate_470d1af4732c40198803905b989655e8","list_currency":"USD","list_rate":6.4,"mode":"test","object":"Rate","rate":5.93,"retail_currency":"USD","retail_rate":8.45,"service":"First","shipment_id":"shp_788aa30b53e04545b4f416af4425c5cd","updated_at":"2024-07-11T20:34:45Z"}},{"easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":3,"percentile_85":3,"percentile_90":4,"percentile_95":6,"percentile_97":6,"percentile_99":9},"easypost_estimated_delivery_date":"2024-07-18","planned_ship_date":"2024-07-16"},"rate":{"carrier":"USPS","carrier_account_id":"ca_716f33fd9fd348238b85c2922237f98b","created_at":"2024-07-11T20:34:45Z","currency":"USD","delivery_date":null,"delivery_date_guaranteed":false,"delivery_days":3,"est_delivery_days":3,"id":"rate_b2bb88b794cc4f8ebe7a341c1cdba683","list_currency":"USD","list_rate":6.4,"mode":"test","object":"Rate","rate":5.93,"retail_currency":"USD","retail_rate":8.45,"service":"ParcelSelect","shipment_id":"shp_788aa30b53e04545b4f416af4425c5cd","updated_at":"2024-07-11T20:34:45Z"}}]}'
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+            url: 'https://api.easypost.com/v2/shipments/shp_788aa30b53e04545b4f416af4425c5cd/smartrate/delivery_date?planned_ship_date=2024-07-16'
             content_type: 'application/json; charset=utf-8'
             http_code: 200
-            header_size: 707
+            header_size: 689
             request_size: 376
             filetime: -1
             ssl_verify_result: 0
             redirect_count: 0
-            total_time: 0.3666
-            namelookup_time: 0.001943
-            connect_time: 0.065165
-            pretransfer_time: 0.131496
+            total_time: 0.542043
+            namelookup_time: 0.025327
+            connect_time: 0.167585
+            pretransfer_time: 0.303692
             size_upload: 0.0
-            size_download: 3893.0
-            speed_download: 10619.0
+            size_download: 3883.0
+            speed_download: 7163.0
             speed_upload: 0.0
-            download_content_length: 3893.0
+            download_content_length: 3883.0
             upload_content_length: 0.0
-            starttransfer_time: 0.366528
+            starttransfer_time: 0.54202
             redirect_time: 0.0
             redirect_url: ''
             primary_ip: 169.62.110.130
             certinfo: {  }
             primary_port: 443
-            local_ip: 10.130.6.39
-            local_port: 53640
+            local_ip: 10.130.6.29
+            local_port: 60415
             http_version: 2
             protocol: 2
             ssl_verifyresult: 0
             scheme: HTTPS
-            appconnect_time_us: 131350
-            connect_time_us: 65165
-            namelookup_time_us: 1943
-            pretransfer_time_us: 131496
+            appconnect_time_us: 303584
+            connect_time_us: 167585
+            namelookup_time_us: 25327
+            pretransfer_time_us: 303692
             redirect_time_us: 0
-            starttransfer_time_us: 366528
-            total_time_us: 366600
+            starttransfer_time_us: 542020
+            total_time_us: 542043
+            effective_method: GET
+            capath: ''
+            cainfo: ''
     index: 0
diff --git a/test/cassettes/smartrate/estimatedDeliveryDate.yml b/test/cassettes/smartrate/estimatedDeliveryDate.yml
new file mode 100644
index 00000000..c348694a
--- /dev/null
+++ b/test/cassettes/smartrate/estimatedDeliveryDate.yml
@@ -0,0 +1,81 @@
+
+-
+    request:
+        method: POST
+        url: 'https://api.easypost.com/v2/smartrate/deliver_by'
+        headers:
+            Host: api.easypost.com
+            Expect: ''
+            Accept-Encoding: ''
+            Accept: application/json
+            Authorization: ''
+            Content-Type: application/json
+            User-Agent: ''
+        body: '{"from_zip":"94107","to_zip":"90277","planned_ship_date":"2024-07-16","carriers":["USPS"]}'
+    response:
+        status:
+            code: 200
+            message: OK
+        headers:
+            x-frame-options: SAMEORIGIN
+            x-xss-protection: '1; mode=block'
+            x-content-type-options: nosniff
+            x-download-options: noopen
+            x-permitted-cross-domain-policies: none
+            referrer-policy: strict-origin-when-cross-origin
+            x-ep-request-uuid: 39ae9bff66905363e79a830d003fe457
+            cache-control: 'private, no-cache, no-store'
+            pragma: no-cache
+            expires: '0'
+            content-type: 'application/json; charset=utf-8'
+            content-length: '1496'
+            x-runtime: '0.088010'
+            x-node: bigweb32nuq
+            x-version-label: easypost-202407111940-3cb16a3462-master
+            x-backend: easypost
+            x-canary: direct
+            x-proxied: ['intlb3nuq fa152d4755', 'extlb1nuq fa152d4755']
+            strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
+        body: '{"carriers_without_tint_estimates":null,"from_zip":"94107","planned_ship_date":"2024-07-16","results":[{"carrier":"USPS","easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":1,"percentile_75":2,"percentile_85":2,"percentile_90":3,"percentile_95":3,"percentile_97":4,"percentile_99":6},"easypost_estimated_delivery_date":"2024-07-17"},"service":"express"},{"carrier":"USPS","easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":3,"percentile_85":3,"percentile_90":4,"percentile_95":6,"percentile_97":6,"percentile_99":9},"easypost_estimated_delivery_date":"2024-07-18"},"service":"groundadvantage"},{"carrier":"USPS","easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":3,"percentile_75":3,"percentile_85":3,"percentile_90":6,"percentile_95":6,"percentile_97":6,"percentile_99":9},"easypost_estimated_delivery_date":"2024-07-18"},"service":"librarymail"},{"carrier":"USPS","easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":3,"percentile_75":3,"percentile_85":3,"percentile_90":4,"percentile_95":6,"percentile_97":6,"percentile_99":9},"easypost_estimated_delivery_date":"2024-07-18"},"service":"mediamail"},{"carrier":"USPS","easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":3,"percentile_85":3,"percentile_90":3,"percentile_95":4,"percentile_97":6,"percentile_99":7},"easypost_estimated_delivery_date":"2024-07-18"},"service":"priority"}],"saturday_delivery":null,"to_zip":"90277"}'
+        curl_info:
+            url: 'https://api.easypost.com/v2/smartrate/deliver_by'
+            content_type: 'application/json; charset=utf-8'
+            http_code: 200
+            header_size: 707
+            request_size: 408
+            filetime: -1
+            ssl_verify_result: 0
+            redirect_count: 0
+            total_time: 0.483989
+            namelookup_time: 0.003915
+            connect_time: 0.128845
+            pretransfer_time: 0.264145
+            size_upload: 90.0
+            size_download: 1496.0
+            speed_download: 3090.0
+            speed_upload: 185.0
+            download_content_length: 1496.0
+            upload_content_length: 90.0
+            starttransfer_time: 0.483954
+            redirect_time: 0.0
+            redirect_url: ''
+            primary_ip: 169.62.110.131
+            certinfo: {  }
+            primary_port: 443
+            local_ip: 10.130.6.29
+            local_port: 63869
+            http_version: 2
+            protocol: 2
+            ssl_verifyresult: 0
+            scheme: HTTPS
+            appconnect_time_us: 264070
+            connect_time_us: 128845
+            namelookup_time_us: 3915
+            pretransfer_time_us: 264145
+            redirect_time_us: 0
+            starttransfer_time_us: 483954
+            total_time_us: 483989
+            effective_method: POST
+            capath: ''
+            cainfo: ''
+    index: 0
diff --git a/test/cassettes/smartrate/recommendShipDate.yml b/test/cassettes/smartrate/recommendShipDate.yml
new file mode 100644
index 00000000..d487c4d1
--- /dev/null
+++ b/test/cassettes/smartrate/recommendShipDate.yml
@@ -0,0 +1,81 @@
+
+-
+    request:
+        method: POST
+        url: 'https://api.easypost.com/v2/smartrate/deliver_on'
+        headers:
+            Host: api.easypost.com
+            Expect: ''
+            Accept-Encoding: ''
+            Accept: application/json
+            Authorization: ''
+            Content-Type: application/json
+            User-Agent: ''
+        body: '{"from_zip":"94107","to_zip":"90277","desired_delivery_date":"2024-07-16","carriers":["USPS"]}'
+    response:
+        status:
+            code: 200
+            message: OK
+        headers:
+            x-frame-options: SAMEORIGIN
+            x-xss-protection: '1; mode=block'
+            x-content-type-options: nosniff
+            x-download-options: noopen
+            x-permitted-cross-domain-policies: none
+            referrer-policy: strict-origin-when-cross-origin
+            x-ep-request-uuid: b8e53c21669051a4e7996dc6003bb7d5
+            cache-control: 'private, no-cache, no-store'
+            pragma: no-cache
+            expires: '0'
+            content-type: 'application/json; charset=utf-8'
+            content-length: '1695'
+            x-runtime: '0.073877'
+            x-node: bigweb43nuq
+            x-version-label: easypost-202407111940-3cb16a3462-master
+            x-backend: easypost
+            x-canary: direct
+            x-proxied: ['intlb3nuq fa152d4755', 'extlb2nuq fa152d4755']
+            strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
+        body: '{"carriers_without_tint_estimates":null,"desired_delivery_date":"2024-07-16","from_zip":"94107","results":[{"carrier":"USPS","easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":2,"percentile_85":2,"percentile_90":3,"percentile_95":3,"percentile_97":4,"percentile_99":7},"delivery_date_confidence":0.47,"estimated_transit_days":1,"ship_on_date":"2024-07-15"},"service":"express"},{"carrier":"USPS","easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":3,"percentile_85":4,"percentile_90":4,"percentile_95":5,"percentile_97":5,"percentile_99":9},"delivery_date_confidence":0.21,"estimated_transit_days":3,"ship_on_date":"2024-07-13"},"service":"groundadvantage"},{"carrier":"USPS","easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":3,"percentile_85":4,"percentile_90":4,"percentile_95":5,"percentile_97":6,"percentile_99":9},"delivery_date_confidence":0.25,"estimated_transit_days":3,"ship_on_date":"2024-07-13"},"service":"librarymail"},{"carrier":"USPS","easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":3,"percentile_85":3,"percentile_90":4,"percentile_95":5,"percentile_97":5,"percentile_99":7},"delivery_date_confidence":0.24,"estimated_transit_days":3,"ship_on_date":"2024-07-13"},"service":"mediamail"},{"carrier":"USPS","easypost_time_in_transit_data":{"days_in_transit":{"percentile_50":2,"percentile_75":3,"percentile_85":4,"percentile_90":4,"percentile_95":5,"percentile_97":5,"percentile_99":7},"delivery_date_confidence":0.19,"estimated_transit_days":3,"ship_on_date":"2024-07-13"},"service":"priority"}],"saturday_delivery":null,"to_zip":"90277"}'
+        curl_info:
+            url: 'https://api.easypost.com/v2/smartrate/deliver_on'
+            content_type: 'application/json; charset=utf-8'
+            http_code: 200
+            header_size: 707
+            request_size: 412
+            filetime: -1
+            ssl_verify_result: 0
+            redirect_count: 0
+            total_time: 0.515128
+            namelookup_time: 0.036003
+            connect_time: 0.170411
+            pretransfer_time: 0.309447
+            size_upload: 94.0
+            size_download: 1695.0
+            speed_download: 3290.0
+            speed_upload: 182.0
+            download_content_length: 1695.0
+            upload_content_length: 94.0
+            starttransfer_time: 0.515087
+            redirect_time: 0.0
+            redirect_url: ''
+            primary_ip: 169.62.110.130
+            certinfo: {  }
+            primary_port: 443
+            local_ip: 10.130.6.29
+            local_port: 61909
+            http_version: 2
+            protocol: 2
+            ssl_verifyresult: 0
+            scheme: HTTPS
+            appconnect_time_us: 309372
+            connect_time_us: 170411
+            namelookup_time_us: 36003
+            pretransfer_time_us: 309447
+            redirect_time_us: 0
+            starttransfer_time_us: 515087
+            total_time_us: 515128
+            effective_method: POST
+            capath: ''
+            cainfo: ''
+    index: 0