[{"path":"/btc-fees","price":"$0.003","description":"Returns current recommended Bitcoin fee rates in sat/vB for fastest, 30-minute, 1-hour, and economy confirmation targets, plus mempool transaction count and vsize. Use it to price a transaction or report network congestion right now.","example":"/btc-fees?network=main"},{"path":"/cidr-calc","price":"$0.002","description":"Takes an IPv4 CIDR block like 10.0.0.0/22 plus an optional IP and returns network address, broadcast, netmask, wildcard, first and last usable host, usable host count, and whether the IP falls inside the block. Handles non-octet boundaries and /31, /32 edge cases.","example":"/cidr-calc?cidr=10.0.0.0%2F22&ip=10.0.3.255"}]