Free SOFR & EFFR API

The New York Fed's two overnight benchmark rates, as JSON, CSV or a single number. No key, no sign-up, no rate limit to apply for. CORS is open, so you can call it straight from a browser.

Loading live from the endpoint below…

The endpoint

GET https://analogarcade.net/api/rates

{
  "fedFunds": 0.0363,
  "fedFundsAsOf": "2026-08-27",
  "sofr": 0.0364,
  "sofrAsOf": "2026-08-27",
  "source": "nyfed"
}

Rates are decimals, not percents — 0.0363 means 3.63%. Dates are the NY Fed's effective date, not the publication date.

Formats

Call	Returns
/api/rates	application/json — both rates and their dates
/api/rates?format=csv	text/csv — one header row, one data row
/api/rates?format=plain	text/plain — just the fed funds number, for a spreadsheet cell

Use it

curl https://analogarcade.net/api/rates

# one number, straight into a cell
curl "https://analogarcade.net/api/rates?format=plain"

const r = await fetch("https://analogarcade.net/api/rates").then(r => r.json());
console.log(r.sofr, r.sofrAsOf);

Google Sheets: =IMPORTDATA("https://analogarcade.net/api/rates?format=csv")

The honest part

This is public data. The New York Fed publishes it free at markets.newyorkfed.org and you can call them directly — nothing here is proprietary. What this endpoint does is hand it to you in one small JSON object with CORS open and a 60-second cache, so you can drop it into a browser app or a sheet without writing a parser or a proxy.

It stays free. There is no key to buy, and there is no plan where it costs money. If it goes down, it goes down — this is a convenience, not something to put under a trading system. Rates are as-of the NY Fed's last published effective date, which means overnight rates lag by a day.