US Per Diem API

GSA lodging and M&IE per diem rates for US cities by ZIP, state and fiscal year.

US Per Diem API is a free Government API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.

Authentication: None required
HTTPS: Yes
CORS: Yes
Category: Government
Uptime (30 days): 100%

Visit documentation ↗us-per-diem-api.narwhalapis.workers.dev

Online · 660 msTested Nov 15, 2026 · checked dailyIs it down? Status & uptime

Key facts

No API key needed
100% uptime (30 days)
Returns JSON at its URL
Callable from the browser (CORS)
HTTPS

Quick start

US Per Diem API returns JSON at us-per-diem-api.narwhalapis.workers.dev with no API key. Verified by our health check on Nov 15, 2026.

Bash

curl -s "https://us-per-diem-api.narwhalapis.workers.dev"

JavaScript

const res = await fetch("https://us-per-diem-api.narwhalapis.workers.dev");
if (!res.ok) throw new Error(`HTTP ${res.status}`);
const data = await res.json();
console.log(data);

Python

import requests

res = requests.get("https://us-per-diem-api.narwhalapis.workers.dev", timeout=10)
res.raise_for_status()
data = res.json()
print(data)

Example response

Trimmed from the live response on Nov 15, 2026.

JSON

{
  "name": "US Per Diem API (GSA FY2026/FY2027)",
  "description": "Official GSA lodging and meals & incidentals (M&IE) per diem rates by ZIP, ci...",
  "endpoints": [
    "/v1/meta",
    "/v1/rates",
    "/v1/mie"
  ],
  "example": "/v1/rates?zip=10001",
  "links": {
    "docs": "https://narwhalthepong.github.io/gumroad-license-check/free-tax-finance-api",
    "rapidapi": "https://rapidapi.com/narwhalapis/api/us-per-diem-api-gsa-lodging-m-ie-rates-2026",
    "openapi": "/openapi.json",
    "spreadsheet": "https://payhip.com/b/ztfN3"
  },
  "free": "Free to use; please keep request rates reasonable.",
  "version": "1.0.0"
}

Step-by-step guides: Python · JavaScript · Node.js · PHP · Java · Go · Ruby · C#

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US Per Diem API FAQ

Is the US Per Diem API free?

Yes. The US Per Diem API is listed in the Government category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.

Does the US Per Diem API require an API key?

No. The US Per Diem API requires no authentication, so you can start making requests without signing up.

Can I call the US Per Diem API from the browser?

Yes. The US Per Diem API supports CORS, so front-end JavaScript can call it directly.

Does the US Per Diem API support HTTPS?

Yes. The US Per Diem API is served over HTTPS, so it's safe to use in production.

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