FastX402

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.

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.

Accepts a comma-separated list of semantic versions and a semver constraint such as ^2.4.0 or >=1.5.0 <2.0.0, then returns matching versions and the highest match. Use it for dependency and release checks.

Accepts a file-size string such as 1.5 MiB, 800 KB, or 42 bytes and returns the exact byte count, detected unit system, and normalized IEC and SI forms. Use it when converting human-readable storage values.

Keccak-256 hash (the Ethereum hash, not SHA3-256) of UTF-8 text or of hex bytes. Use it for Solidity storage keys, event topics, commitments or checking a hash an agent computed.

Exact conversion between a token's decimal amount and its integer base units (wei, USDC atomic units...) for any decimals 0-36. No floating point. Use it before signing a transfer or reading a balance.