Cargado carries its own vetted network of Mexican carriers, so you don't need a Mexico onboarding pipeline to reach them.
You don't need your own pipeline to reach Mexican carriers. Mexican carriers are on Cargado directly. Cargado vets them, and they bid on your postings the same way a U.S. carrier does. See How Cargado vets carriers for what that check covers.
As with any posting, every carrier that fits your lane, equipment and crossing gets notified. See Part 3 · Post it right.
A Mexican carrier's Cargado profile carries its RFC (tax ID) and SCT permit, along with the supporting documents Cargado collects at signup: constancia de situación fiscal, acta constitutiva, proof of address, and the legal representative's ID.

On the posting form, under Border Crossing, you choose how the load moves at the crossing: Pre-set transfer (you already have a transfer arranged; for freight headed into Mexico, this also means no B1 drivers), or Transfer by carrier (the bidding carrier handles getting the freight across). Pick whichever matches how you want that leg handled. For choosing the crossing location itself, see Which border crossing should I put on a posting?

Cross-border freight needs a customs broker to clear it. If your customer does not have one, help them find one before you book the load. Let the customs broker quote their fees to your customer directly rather than folding them into your rate.
A match does not hand off the paperwork. You still onboard the carrier through your own process, assign them in your TMS, send your own rate confirmation, and pay them directly. Cargado never touches carrier payment, for a Mexican carrier or any other.
Email us and a person on our team will answer. Send the posting link or a screenshot if you have one.