Shipping Terms & Claims Policy
Effective date: August 1st, 2026
1. Agreement and scope
These Shipping Terms & Claims Policy (“Shipping Terms”) govern shipping services made available through Z Rex LLC (“Z Rex,” “we,” or “us”), including rate comparisons, label purchases, tracking, shipping billing, and claims assistance. “You” means the organization that registers for or purchases these services. The person accepting these Shipping Terms represents that they have authority to bind that organization.
These Shipping Terms become binding when you affirmatively accept them in the shipping enrollment or purchase process. They incorporate our Acceptable Use Policy at https://zrexsolutions.com/acceptable-use-policy/. Our Privacy Policy at https://zrexsolutions.com/privacy-policy/ describes personal-information handling; it is not consent to unrelated marketing.
A separately signed agreement that expressly addresses shipping controls over conflicting provisions of these Shipping Terms. Otherwise, these Shipping Terms control shipping matters over general website or software terms, including software subscription, renewal, and software refund provisions. Any applicable data processing agreement controls processing of customer personal data within its scope. Carrier terms govern carriage and carrier liability; these Shipping Terms govern the relationship between you and Z Rex. Nothing here reduces rights or obligations that applicable law makes nonwaivable.
2. Services, eligibility, and carrier role
Z Rex provides access to shipping tools and helps coordinate services supplied by participating carriers and shipping providers. We use EasyPost to create labels and primarily offer FedEx, USPS, and UPS services. The selected carrier performs transportation and delivery. Z Rex does not take physical custody of your shipment through the platform service. Carrier availability, services, routes, commodity acceptance, and rates may differ by account and shipment.
Promotional access may be limited to customers of a participating laboratory or another eligible group, as identified in the offer. You must accurately describe your eligibility. Laboratory affiliation does not itself make the laboratory a party to these Shipping Terms or responsible for your shipping charges or claims.
Only services made available and authorized for your account are supported. Availability of a quote or label does not establish that a shipment’s contents, packaging, or route comply with applicable requirements. Freight or other services not enabled for your account are outside this offer.
The carrier and provider terms applicable to your selected service, including carriage conditions, tariff or service-guide provisions, prohibited-item rules, claim limits, and deadlines, will be identified or linked before purchase. See the provider schedule in Section 13. Carrier terms may change according to their own provisions. No Z Rex employee may alter a carrier’s obligations without that carrier’s authorization.
3. Accounts and authorization
You are responsible for accurate organization, billing, sender, recipient, and shipment details; managing authorized users; protecting credentials; and promptly reporting suspected misuse. You authorize Z Rex and the providers needed to fulfill your selected service to transmit shipment information, obtain labels, process authorized charges, and coordinate eligible claims.
Use labels and carrier accounts only through the methods authorized for your organization. Do not resell access, distribute account numbers, duplicate labels, misrepresent a sender, or permit unauthorized third-party billing. An inbound label must identify the actual sender and recipient; you are responsible for providing the sender with the applicable shipping instructions and obtaining lawful authority to share their information. The person preparing and tendering the package remains responsible for the requirements applicable to that activity.
4. Rates, discounts, and adjustments
There is no subscription fee for the shipping access described in this offer. You remain responsible for purchased labels and disclosed applicable charges. Optional products or services may have separate charges disclosed before selection. A paid software subscription is separate and is not created by purchasing a shipping label.
Quotes depend on the details supplied, selected service, and rates available at the time. Savings vary. A maximum or average savings figure applies only to the comparison and eligible shipments expressly described with that figure, and does not guarantee a discount on every shipment or against your existing negotiated rates.
Final charges may change following carrier verification. You are responsible for correctly assessed charges attributable to your shipment, including actual or dimensional weight corrections, fuel and delivery-area surcharges, residential service, address corrections, additional handling, oversize packages, pickup or Saturday service, returns, and applicable duties or taxes. Not every charge applies to every shipment. We will identify a separate Z Rex fee and its amount or calculation before you incur it. We will not add an undisclosed discretionary fee retroactively.
We will make available the basis for a billed adjustment on reasonable request. You are not responsible for an adjustment caused solely by Z Rex’s error in transmitting accurate information you supplied; this does not excuse charges otherwise properly due for your shipment.
5. Payment and invoice questions
Unless we approve invoicing, payment is due when a label or optional service is purchased. Approved invoiced accounts must pay in U.S. dollars within 30 days of the invoice date unless separately agreed in writing. You are responsible for applicable transaction taxes and duties, excluding taxes on Z Rex’s income.
Any charge to a stored payment method must be within the authorization you give in the payment process. Properly assessed later carrier adjustments may be invoiced or charged under that authorization. Please report a billing question to shipping@zrexsolutions.com within 30 days after the charge or invoice, with the shipment reference and reason. We will review it and coordinate an appropriate carrier inquiry. This requested reporting period does not shorten nonwaivable rights or a longer applicable contractual dispute period. Pay undisputed amounts while a good-faith dispute is reviewed.
We may suspend new label purchases for undisputed overdue balances after notice and a reasonable opportunity to resolve the issue. We will not suspend solely for an amount you dispute in good faith while paying undisputed amounts and cooperating with the review.
6. Label cancellations and refunds
Purchasing or creating a label does not establish that a carrier has accepted the package. If a label will not be used, request a void or refund through the available account feature or shipping@zrexsolutions.com promptly and within the applicable provider’s published window. A void request is not confirmation of cancellation or a refund.
Unused-label eligibility, verification, processing times, and credits depend on the applicable service and provider terms. Used labels and completed transportation ordinarily cannot be canceled; claims and service-guarantee requests follow Section 9. A software subscription refund offer does not apply to shipping labels.
We will pass through a refund or credit due to you after it is confirmed and received from the provider, without an additional undisclosed deduction. We will initiate the corresponding refund or account credit promptly and explain the status on request; payment-provider posting times may vary. Any separately charged Z Rex service fee is refundable as disclosed before purchase or as required by law. Charges caused by a Z Rex billing error will be corrected without requiring carrier recovery first.
7. Shipment preparation and restricted contents
You and the person preparing or tendering the shipment must comply with applicable law and the rules for the selected carrier, service, route, and account. This includes truthful contents descriptions, classification, suitable packaging, weight and dimensions, labels and markings, documentation, licenses, permits, training, and any necessary approvals.
Veterinary specimens, biological materials, medications, dry ice, preservatives, chemicals, and temperature-sensitive materials may be restricted or require special handling. Carrier acceptance of an item in general does not establish that the Z Rex account or selected service is authorized for it. Do not tender regulated hazardous materials, infectious substances, controlled substances, or other restricted goods unless shipment is lawful and all required carrier, account, service, and shipper approvals are in place.
For time- or temperature-sensitive contents, you must choose appropriate packaging, refrigerants, transit service, pickup timing, and contingency arrangements. The platform does not provide a clinical, pharmaceutical, dangerous-goods, or packaging compliance determination. You are responsible for lawful dispensing and shipment of medications and lawful handling of specimens. No label purchase guarantees specimen viability, a particular storage temperature, or diagnostic usefulness.
The carrier may refuse, return, hold, inspect, or otherwise handle noncompliant goods as allowed by law and its terms. You are responsible for lawful charges and losses arising from your noncompliance, subject to Section 10.
8. Transit, tracking, and delivery
Delivery estimates and tracking updates are supplied by carriers or other providers and may change. A pickup, reroute, address-change, delivery, or support request is not a guarantee that the requested action will occur. Any carrier money-back or service guarantee applies only under that carrier’s eligibility, exclusions, deadlines, and refund terms. Z Rex provides no separate delivery-time guarantee unless expressly agreed in writing.
Weather, service disruptions, customs, recipient availability, and other events may affect delivery. Contact us promptly if tracking indicates a problem. Do not rely on ordinary parcel tracking as a substitute for a separately agreed chain-of-custody or temperature-monitoring service.
9. Loss, damage, delay, and claims assistance
For a label purchased through Z Rex, notify shipping@zrexsolutions.com as soon as you discover loss, damage, delay, or another potential claim. Include the tracking number, shipment date, issue, and available supporting documents. Keep packaging, photographs, proof of contents and value, and other evidence requested by the provider. Different carriers, services, and claim types have different notice and filing deadlines; the applicable terms identified before purchase control. Contact us early enough for the required submission to be completed. Notification to Z Rex does not itself constitute carrier filing or extend a deadline.
We will use reasonable care in coordinating eligible claims submitted with timely and complete information, including filing or routing them through the authorized account holder when that process is available. You authorize us to submit supporting information for that purpose and agree to cooperate. We will tell you if you must submit directly or provide additional information. Our assistance does not guarantee acceptance, payment, or a completion date, and does not excuse our own failure to perform an express obligation under these Shipping Terms.
The applicable carrier or protection provider determines eligibility and payment under its terms. Declared value may limit carrier liability and is not necessarily insurance. Any optional insurance or shipment protection applies only if actually offered, selected, and purchased, under the separately identified provider’s terms. Do not assume that a label includes insurance or full replacement-value coverage.
Available recovery may be limited and may exclude spoilage, loss of diagnostic value, recollection costs, delay, or other categories. Review the applicable coverage before shipping valuable or irreplaceable contents. Z Rex will pass through claim proceeds attributable to your loss that it receives on your behalf, subject to any specific settlement you authorize and legally required deductions. There is no duplicate recovery for the same loss.
Z Rex may separately offer a discretionary goodwill credit or payment, including when a carrier denies a claim. Any such goodwill reimbursement is limited to the postage you actually paid through Z Rex for the affected shipment, less any refund, credit, or other reimbursement already received for that same postage. It does not reimburse package contents, specimen value, replacement or recollection costs, or other losses. For this purpose, postage means the carrier transportation charge paid for the affected label, excluding separately itemized taxes, duties, optional insurance or protection, packaging, and non-postage service fees. All goodwill credits or payments for the same shipment are combined for this limit.
Goodwill assistance is not insurance, is not guaranteed, and does not create an obligation for another claim. Any advance, repayment condition, or treatment of later carrier proceeds must be stated in the written offer before you accept it. This goodwill limit does not reduce independently available carrier or insurer recovery, required refunds, or Z Rex liability imposed by applicable law or an express contract. We will not settle a claim on terms requiring you to release additional rights or assume obligations without your authorization.
10. Responsibility and limits
Each party remains responsible for its own obligations under these Shipping Terms. Z Rex is not responsible for a carrier’s transportation acts solely because you purchased its label through our platform. Carrier liability is determined under applicable law and carrier terms. This allocation does not excuse Z Rex’s own breach or any responsibility imposed on Z Rex by nonwaivable law.
To the extent permitted by law, Z Rex does not provide implied warranties of merchantability, fitness for a particular purpose, or uninterrupted availability for the shipping platform, beyond its express commitments in these Shipping Terms.
To the extent permitted by law, Z Rex will not be liable for indirect, special, incidental, consequential, or punitive losses, including lost profits, loss of business, or consequential losses arising from delayed, spoiled, or unusable specimens. For other claims arising from the shipping services, Z Rex’s total aggregate liability for events in any 12-month period will not exceed the greater of $500 or the shipping service fees retained by Z Rex from your organization during the six months before the first event giving rise to those claims. Carrier transportation charges, taxes, and other pass-through amounts are excluded from that fee calculation.
These exclusions and cap do not limit refunds, carrier proceeds, or other money that Z Rex must remit to you; liability for fraud, willful misconduct, or gross negligence; liability that cannot lawfully be excluded; or obligations governed by a separate signed data processing agreement, whose liability terms control within its scope. They do not increase or reduce the carrier’s own liability limits.
You will reimburse Z Rex for documented third-party charges, penalties lawfully imposed, and direct losses to the extent caused by your unlawful shipment, knowing misdescription, unauthorized account use, or material failure to comply with Section 7. This does not cover amounts caused by Z Rex’s own negligence or misconduct. Z Rex will give prompt notice, reasonable supporting detail, and a reasonable opportunity to dispute the amount, and will not agree to a settlement binding you without your consent.
11. Suspension and ending access
You may stop purchasing shipping services at any time. Ending shipping access does not itself cancel a separate software agreement or eliminate charges properly incurred, pending claim cooperation, or refund obligations.
Z Rex may restrict affected shipping access for material misuse, loss of eligibility, an urgent safety or security risk, a legal requirement, or a carrier’s withdrawal of authorization. Where reasonably practicable, we will give notice and an opportunity to resolve the issue, limit restrictions to what is necessary, and restore access after resolution. We will cooperate reasonably with completing pending billing, refunds, and eligible claims after access ends. Information retention follows the applicable agreement, Privacy Policy, and legal requirements.
12. Updates, disputes, and contact
We will identify updates by an effective date. Material changes to your shipping obligations will be presented for affirmative acceptance before new purchases under the revised terms. A revision does not retroactively change an existing shipment, claim, or dispute. Carrier terms change under their own applicable rules, subject to law.
Unless a separately signed agreement governing shipping specifies otherwise, Utah law governs the relationship between you and Z Rex, excluding conflict-of-law rules. Courts with jurisdiction in Salt Lake County, Utah will hear disputes between you and Z Rex, subject to nonwaivable law. No mandatory arbitration or class-action waiver is created by these Shipping Terms. Carrier dispute provisions govern claims against the carrier to the extent applicable.
If a provision is unenforceable, the remainder continues to apply. Failure to enforce a provision is not a waiver. Provisions concerning accrued payment, refunds, claims, responsibility, limits, and disputes survive as necessary to give them effect.
Contact: shipping@zrexsolutions.com. Legal notices: Z Rex LLC, 6905 S 1300 E, Suite 325, Cottonwood Heights, UT 84047, USA; contact@zrexsolutions.com.
13. Participating provider and carrier terms
We use EasyPost for label creation. Primary carriers are FedEx, USPS, and UPS. The following official resources identify relevant terms and procedures; only terms applicable to your selected service, account, and transaction apply. Listing a resource does not mean you must open a direct carrier account or accept unrelated commercial products.
EasyPost legal center, including applicable shipping/provider policies: https://legal.easypost.com/ . EasyPost unused-label refund guidance: https://support.easypost.com/hc/en-us/articles/360044353831-Refunds .
FedEx Service Guide and terms: https://www.fedex.com/en-us/service-guide.html .
UPS terms and conditions of service: https://www.ups.com/us/en/support/shipping-support/legal-terms-conditions .
USPS domestic claim procedures and links to governing postal rules: https://www.usps.com/help/claims.htm . USPS domestic postage-refund procedures: https://www.usps.com/help/refunds.htm . International shipments, if enabled, have separate applicable requirements.