Most cross-border shipments change hands -- and tracking systems -- at the border. You print one label to get the parcel to the crossing, then a second carrier picks it up on the other side under a different number. We think that's a bad experience, so we built around it instead.
A WorldBridges tracking number stays the same from the moment a label is created to the moment it's signed for, whether the parcel never leaves Massachusetts or crosses into Ontario along the way. Behind the scenes, our network handles the handoff; on the tracking page, it's just one continuous timeline.
That timeline is also what the public tracking page and the GET /v1/tracking/{number} API endpoint both read from -- the same event stream, whether a human or a script is asking.