What Proxy Bastion is - Proxy Bastion sits in front of proxies you already pay for and hands out revocable, metered relay links instead of your upstream credentials.
Relay links - How a relay link is shaped, what a renter can see, and why a forwarded link is not attributable.
Security model - What is isolated from the renter, what is stored in plain text, and how long a revoked link can stay usable.
Pools and failover - Group upstream proxies into a failover pool so one dead member does not take a relay link down.
Limits and revocation - Expiry, traffic caps, and the kill switch that let you cut off one relay link without touching any other.
What Proxy Bastion does not do - The honest limits of the product - no proxies for sale, no fix for a banned upstream IP, and no socks5 support yet.