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Dataset Files

Each file has a stable URL (r-link) that you can use directly in scripts, apps, or AI agents. These URLs are permanent and safe to hardcode.

/calcfi/calcfi-15-year-fixed/

├ README.md

https://datahub.io/calcfi/calcfi-15-year-fixed/_r/-/README.md

├ data.csv

https://datahub.io/calcfi/calcfi-15-year-fixed/_r/-/data.csv

└ datapackage.json

https://datahub.io/calcfi/calcfi-15-year-fixed/_r/-/datapackage.json

Key Files

Start with these files — they give you everything you need to understand and access the dataset.

datapackage.json— metadata & schema

https://datahub.io/calcfi/calcfi-15-year-fixed/_r/-/datapackage.json

README.md— documentation

https://datahub.io/calcfi/calcfi-15-year-fixed/_r/-/README.md

Typical Usage

1. Fetch datapackage.json to inspect schema and resources
2. Download data resources listed in datapackage.json
3. Read README.md for full context

Data Files

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data

Field	Type	Format	Description
date	date	%Y-%m-%d	Observation date (YYYY-MM-DD).
value	number		Value as a percent (e.g. 6.36 means 6.36%).
unit	string		Unit of observation (matches manifest).

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About

Last updated: 19 May 2026
Total rows: ...
Format: CSV
File size: 43.6 kB
Sources: Federal Reserve Economic Data (FRED); CalcFi live page
License: Creative Commons Attribution 4.0 International

About this dataset

15-Year Fixed Mortgage Rate

Weekly observations of 15-Year Fixed Mortgage Rate (15yr Fixed).

At a glance

Field	Value
Slug	`15-year-fixed`
Category	mortgage-rates
Unit	percent
Cadence	weekly
Source	Freddie Mac via FRED (MORTGAGE15US)
Source series ID	`MORTGAGE15US`
License	CC BY 4.0

Live data on CalcFi

Latest value + chart: https://calcfi.app/rates/history/15-year-fixed
JSON API (no auth): https://calcfi.app/api/rates/15-year-fixed
CSV (this file, daily-refreshed via cron): data.csv

Quick start

# Latest single value from the API
curl https://calcfi.app/api/rates/15-year-fixed

# Full history from this repo
curl https://raw.githubusercontent.com/jerehere/calcfi-open-data/main/datasets/15-year-fixed/data.csv

import pandas as pd
url = "https://raw.githubusercontent.com/jerehere/calcfi-open-data/main/datasets/15-year-fixed/data.csv"
df = pd.read_csv(url, parse_dates=["date"])
print(df.tail())

Source + provenance

This dataset mirrors Freddie Mac via FRED (MORTGAGE15US) (MORTGAGE15US). Primary source: Federal Reserve Economic Data (FRED).

Values are pulled daily by a GitHub Actions workflow (.github/workflows/refresh.yml) from CalcFi's read-only data API, which itself pulls from primary sources. No transformations or imputations are applied; values are passed through verbatim.

Citation

If you use this dataset, please cite:

CalcFi (2026). 15-Year Fixed Mortgage Rate dataset. https://calcfi.app/rates/history/15-year-fixed

License

CC BY 4.0 — attribution requested. The data itself is sourced from Federal Reserve Economic Data (FRED); consult their terms for any additional restrictions.