As I understand how that is written, you have $5 to use for the first 30 days for free then you will be charged $1 a month and I assume you then have $1 a month in credits going forward until you upgrade.

Actually I think that you receive $5 of credits during the first month, after which your receive $1 of credits each month.

I'm pretty sure you're not charged anything on the free plan.

The pricing page wording is describing the $1 of free resource credits you receive each month on the Free plan, not a $1 charge. After your 30-day trial (with its one-time $5 grant) expires, your account moves to the Free plan which gives you $1/month in free usage at no cost. There is no way to add billing info on the Free plan since the subscription is $0/month. If your usage stays under $1/month, the Free plan covers it. If you need more than $1/month in resources, the next step up is the Hobby plan at $5/month.

I read this same page yesterday and was also confused. I was suggesting railway to someone but it took me a moment to decode if the pricing had changed. I think the language should be updated?

It actually doesn't automatically move to the free plan from the free trial. I had to click a downgrade button to select the free plan. Tbh I would prefer to just pay $12 for a year with $12 usage credits and enable a non-serverless deployment since the startup time is kind of annoying for a message relay server.