Reverse VAT calculation

Resolve ENS name to Ethereum address, or reverse-resolve address to ENS name.

Auto 10.21%/20.42% rate selection with reverse calculation.

Check IP reputation: blacklists, Tor exit node detection, reverse DNS.

Forward + reverse geocoding via Nominatim/OpenStreetMap. $0.01/query via x402.

Check what primary ENS name is set for a wallet address (reverse resolution). Returns the ENS name that this address resolves to, or null if no primary name is set. This verifies both directions: - Reverse: address → name (the reverse record) - Forward: name → address (confirms the name actually points back to this wallet) If either direction is missing, the primary name won't resolve. Use this to: - Verify a primary name was set correctly after set_primary_name - Check if a wallet has any primary name configured - Debug why a primary name isn't showing up (missing ETH address record)