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460+ carrier integrations worldwide for your own contracts, and 15+ carriers on OTO rates. All of them connect from a catalog. OTO is software and does not carry parcels — it connects you to the companies that do.

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Two ways to ship

Both can run on one account, and automation chooses between everything available.

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Connecting one

Integrations → Shipping Partners has two tabs — the catalog and what you have connected. Filter by Country and Service Type, then open a carrier.
A carrier is not one integration — it is several servicesOpening a carrier does not connect it. It lists that carrier’s services, each connected separately: Aramex alone offers domestic, international, heavy and bulky, PUDO, same-day and banking.This matters because a service is what a shipping rule selects. Connecting “Aramex” without connecting Aramex Same Day leaves a rule that references same-day with nothing to choose.
Connection is two steps: Credentials, then Settings. The full walkthrough is in Carrier integration.

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Service types

Carriers are classified by what they actually do, and rules and the checkout API both filter on it: Express · Same Day · Regular · Fast Delivery · Cold Delivery · Heavy & Bulky · Locker Delivery · PUDO (pick up drop off) · International.
The in-product count is smaller than 460, and that is expectedThe catalog filters to the partners available where you operate. A merchant in one country sees that country’s carriers, not the global list.The global figure is what the platform integrates with; the number on your screen is what you can connect today.

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Your own drivers

OTO FLEX puts your own fleet into the same selection. A rule that weighs carriers weighs your drivers too, on the same terms — which is the point of not being a carrier: nothing in the routing has a reason to prefer one option over another except cost, coverage and performance.