RouteXL is free to use for all routes up to 20 stops, under a fair-use policy. If you plan multiple routes a day, but never have more than 20 addresses to enter, there is no payment required. The free version is fully functional, you can use all goodies.
Registration is not required. You can use the route planner without an account. You do need an account to change some Options.
The premium service allows you to add more stops. There are upgrades for routes up to 100 stops and up to 150 stops. You can either upgrade your account using Paypal, or buy one-off access codes which do not require registration either. Both methods are automated and instantly available.
To upgrade an account: https://www.routexl.nl/blog/subscriptions/
Businesses based in Europe can request a subscription or access code with payment on invoice. This is however a manual process and therefore not instantly available. It may need a couple of days to set up. We may also require the first payment in advance.
To pay on invoice: https://www.routexl.nl/blog/betaling-op-factuur/?lang=en