Microchips: do I need to pay a fee beyond the chip insertion?

Do I need to pay the microchip company to keep my dog’s chip number and my contact info active?

We just adopted a dog with a 24PetWatch chip. They’re sending emails asking for money to ensure her protection. I just want to know if my contact info will be on file if she gets lost.

It seems I don’t need to pay anything:

"While annual memberships are an option for some pet owners, they are not required. Register your microchip for free and then decide if you want additional protection services.