How do I know how fresh a fund's data is (as-of date)?

Where it is in the response

Sample for iShares Core MSCI World UCITS ETF (IE00B4L5Y983):

json
{
  "cached": true,
  "generatedAt": "2026-09-12T06:00:00.000Z",
  "expiresAt": "2026-09-13T06:00:00.000Z",
  "data": { "dataAsOf": "2026-09-01" }
}

Where the figure comes from

Fund houses publish factsheets monthly and holdings files daily; the API re-reads them at most every 24 hours per ISIN. dataAsOf is the date to show users; expiresAt is the date to cache until. How fresh is fund data walks through the cases.

The request

bash
curl -s --max-time 300 https://fundfactsapi.com/api/v1/funds/IE00B4L5Y983 \
  -H "Authorization: Bearer $FUNDFACTS_API_KEY" | jq '{asOf: .data.dataAsOf, generatedAt, expiresAt}'

python
import os, requests
r = requests.get("https://fundfactsapi.com/api/v1/funds/IE00B4L5Y983",
                 headers={"Authorization": f"Bearer {os.environ['FUNDFACTS_API_KEY']}"}, timeout=300)
fund = r.json()
print(fund["name"], fund['data']['dataAsOf'])

javascript
const res = await fetch("https://fundfactsapi.com/api/v1/funds/IE00B4L5Y983", {
  headers: { Authorization: `Bearer ${process.env.FUNDFACTS_API_KEY}` },
  signal: AbortSignal.timeout(300_000),
});
const fund = await res.json();
console.log(fund.name, fund.data.dataAsOf);

Sign up at fundfactsapi.com/signup for a key; the Free plan is 5 lookups a month with no card. Without a key, GET https://fundfactsapi.com/api/v1/demo/funds/IE00B4L5Y983 returns the same payload for funds already in the store (30 calls a minute per IP; it never loads a new fund).

Caveats

• A payload can be a day old while its figures are a month old; that is the nature of factsheet data and is stated explicitly rather than hidden.
• The change feed (GET /changes) and webhooks (your watched funds from Starter, every fund on Scale) tell you when a tracked field actually moved between refreshes.

Several funds at once

POST /funds with { "isins": ["…", "…"], "wait": true } returns the same payload for up to 10 ISINs per call on Starter, 50 on Pro and 200 on Scale. One request is counted per fund found. X-RateLimit-Remaining on every response tells you how many are left this month; a 429 rate_limited response carries Retry-After. Search and /me are free.

A fund never loaded before is read on demand from the documents the fund house publishes. That first call takes 15 seconds to about 3 minutes; set your client timeout to 300 seconds and do not fire a second request for the same ISIN while the first is running. Every later call returns from the store in well under a second with cached: true; past 24 hours the payload comes back flagged stale: true while a refresh runs in the background, and nothing older than 7 days is served without a new read.

Everything else in the payload is listed in the field reference.