US Census Bureau geocoder: a one-line US street address (or a lat/lon) to matched address and coordinates plus Census geographies: state and county with FIPS codes, census tract, block group and block GEOID, place/city, congressional district, state legislative districts, ZCTA, metro/micro area and urban area where available. Public-domain US government data; useful for district lookups, data joins and address normalisation. Price: $0.01 USDC per successful call (x402, Solana). Same tool over HTTPS: GET https://scorptech.it.com/api/x402/v1/census-geographies