Cloudflare Zero Trust Tunnel pricing

Hi,

I'm planning to use Tunnel option from Zero Trust, however its free tier until "50 users", how does it count? I want to make my webserver reachable through this, however the only traffic it'll get is outsider users will simply send a HTTP request to get whitelisted, so there wont be any lot of traffic. There will be no authentication policy. What if this URL gets DDoS'd?
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