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API Access

Access dataset files directly from scripts, code, or AI agents.

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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-prime-rate/

├ README.md

https://datahub.io/calcfi/calcfi-prime-rate/_r/-/README.md

├ data.csv

https://datahub.io/calcfi/calcfi-prime-rate/_r/-/data.csv

└ datapackage.json

https://datahub.io/calcfi/calcfi-prime-rate/_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-prime-rate/_r/-/datapackage.json

README.md— documentation

https://datahub.io/calcfi/calcfi-prime-rate/_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: 292 kB
Sources: Federal Reserve Economic Data (FRED); CalcFi live page
License: Creative Commons Attribution 4.0 International

About this dataset

Prime Lending Rate

Live, free, machine-readable economic data. Sourced from primary government datasets, updated on the published cadence.

Download

CSV: https://calcfi.app/api/rates/prime-rate?format=csv
JSON (latest value): https://calcfi.app/api/rates/prime-rate

Columns: date,value,source (one row per observation, sorted ascending by date).

Live page

Interactive chart + 10-year history + stats: https://calcfi.app/rates/history/prime-rate

Metadata

Field	Value
Slug	`prime-rate`
Category	interest-rates
Primary source	Federal Reserve via FRED (DPRIME)
Update cadence	daily
Last README sync	2026-06-04

License

CC-BY 4.0 — attribute to CalcFi with a link to https://calcfi.app/rates/history/prime-rate.

Why the CSV link points to calcfi.app

The previous data.csv link in this dataset's datahub.io storage was unreachable (404). CalcFi now serves the canonical CSV directly via its content-negotiated rates API, which reads from the same Supabase-cached pipeline that powers the live page above. The CSV is regenerated on every request from the most recent stored observations, so it stays in sync with the live page without a separate publishing step.