{"database": "calcfi-open-data", "table": "sources", "rows": [["15-year-fixed", "15-Year Fixed Mortgage Rate", "Freddie Mac via FRED (MORTGAGE15US)", "https://fred.stlouisfed.org/series/MORTGAGE15US", "https://calcfi.app/data/mortgage-rates/15-year-fixed", "CC-BY-4.0 (attribute to CalcFi + primary source when citing)", "2026-05-19T17:05:16.128Z", 1812]], "columns": ["slug", "title", "source", "primary_url", "canonical_url", "license", "retrieved", "row_count"], "primary_keys": ["slug"], "primary_key_values": ["15-year-fixed"], "units": {}, "query_ms": 0.9350700001959922, "source": "CalcFi Open Data \u00e2\u20ac\u201d primary-source mirror", "source_url": "https://calcfi.app/developers", "license": "CC BY 4.0", "license_url": "https://creativecommons.org/licenses/by/4.0/"}