--- title: "How do I look up a fund or ETF by its ISIN?" description: "One GET request per ISIN returns the fund's name, key facts, fees, risk indicator, holdings, exposures, returns and as-of date as JSON. The request, the response and the rules." canonical: https://fundfactsapi.com/answers/how-to-look-up-a-fund-by-isin published: 2026-09-12 updated: 2026-10-13 publisher: FundFacts API --- # How do I look up a fund or ETF by its ISIN? **Short answer:** Send GET https://fundfactsapi.com/api/v1/funds/{isin} with the header Authorization: Bearer . The response is the fund's name plus a data object with key facts, TER, the 1–7 risk indicator, a classification profile, top holdings, sector, country and asset weights, calendar and annualised returns, a monthly series, risk statistics and the as-of date of the figures. A free key (5 lookups a month) is enough to try it; the keyless demo endpoint shows the shape for already-loaded funds. ## The request ```bash curl -s --max-time 300 https://fundfactsapi.com/api/v1/funds/IE00B4L5Y983 -H "Authorization: Bearer $FUNDFACTS_API_KEY" ``` The ISIN is case-insensitive; the response echoes it in upper case. `X-Api-Key: ` is accepted instead of the bearer header. ## The response ```json { "isin": "IE00B4L5Y983", "name": "iShares Core MSCI World UCITS ETF", "cached": true, "generatedAt": "2026-09-12T06:00:00.000Z", "expiresAt": "2026-09-13T06:00:00.000Z", "plan": "free", "quota": { "limit": 15, "remaining": 14, "used": 1, "resetAt": "2026-10-01T00:00:00.000Z" }, "data": { "keyFacts": { "assetClass": "Equities", "currency": "USD", "aum": "USD 151.7bn", "inception": "2009-09-25", "distribution": "Accumulating", "holdings": 1253 }, "headlineMetrics": { "ter": "0.20%", "volatility3y": "11.8%", "sharpe3y": "1.68" }, "riskRating": 6, "profile": { "kind": "equity", "category": "Global Equity", "riskBand": "high", "regionFocus": "Global" }, "topHoldings": [ { "name": "NVIDIA", "weight": 5.48 } ], "sector": [ { "label": "Information Technology", "weight": 29.8 } ], "geography": [ { "label": "United States", "weight": 72.07 } ], "calendarReturns": { "years": ["2024", "2025"], "fund": [18.7, 21.2], "benchmark": [18.7, 21.1] }, "dataAsOf": "2026-09-01" } } ``` The response is one JSON envelope: `isin`, `name`, `cached`, `generatedAt`, `expiresAt`, `plan`, `quota` and a `data` object. Inside `data` you get `keyFacts` (asset class, currency, fund size, inception date, distribution policy, number of holdings), `headlineMetrics` (TER, AUM, 3-year volatility and Sharpe, yield to maturity and duration for bond funds), `riskRating` (the 1–7 KID indicator), `profile` (a rule-based classification: kind, category, risk band, region focus, sector tilt), `topHoldings`, `sector`, `geography`, `region`, `assetAllocation`, `creditQuality`, `maturity`, `calendarReturns`, `annualisedReturns`, `cumulativePerformance`, `indexedPerformance`, `metrics` (max drawdown, P/E, income yield…), `sfdrArticle`, `costs` (PRIIPs entry, exit, ongoing, transaction and performance fees, reduction in yield) and `dataAsOf`, the date of the underlying figures. Money and percentages arrive as the fund house prints them, as strings such as `"0.20%"` or `"USD 151.7bn"`. Breakdown weights and return series are plain numbers in percent. Fields that do not apply to the fund's asset class are empty strings, `null` or empty arrays, never missing keys; treat empty as "not disclosed", not as zero. ## Rules that save you requests - **Each share class is its own ISIN.** The accumulating USD class, the distributing EUR class and the hedged class of one fund are three ISINs with three payloads. `GET /search?q=` (free) lists them with currency and distribution policy so you can pick before you spend a request. - **Not every ISIN is a fund.** A stock, bond or index ISIN returns `404 fund_not_found`. Validate the format first with the [ISIN validator](https://fundfactsapi.com/tools/isin-validator) rules. - **First call is slow.** 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. - **Cache it.** 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. ## Several 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. ## FAQ ### Can I look up by ticker, WKN or SEDOL instead? The key is the ISIN. Search by name usually resolves it in one step, and every broker page and factsheet prints the ISIN. The glossary explains how the identifiers relate. ### Do I need a credit card to try it? No. The Free plan is 5 lookups per month with no card; sign up with an e-mail address or Google and the key is shown in the dashboard. ### Which ISINs work? Any share class of a UCITS fund, ETF, money-market fund or open-end fund whose management company publishes a product page, factsheet and KID. Each share class has its own ISIN and is looked up on its own. Stocks, bonds and indices are not funds and return 404 fund_not_found. ### How current are the figures? Each ISIN is re-read from the fund house's documents at most every 24 hours; a request past that is answered at once from the store (stale: true) while the refresh runs in the background. data.dataAsOf is the as-of date printed on the documents, typically the last month end for a factsheet and the last trading day for holdings files. ## About FundFacts API FundFacts turns any fund or ETF ISIN into one dated factsheet (fees and KID costs, the 1–7 risk indicator, holdings, sector and country exposure, returns) read from the fund house's own documents: as a client-ready PDF under your firm's name for advisers and wealth managers, as JSON through its API for developers, or inside ChatGPT and Claude through its MCP server. FundFacts works inside ChatGPT and Claude as a connector (a remote MCP server): ask about any fund or ETF by ISIN, ticker or name and the assistant answers from FundFacts' dated figures, fees, risk, holdings, exposure and returns, with fund cards, side-by-side comparisons, holdings overlap and portfolio look-through. - Free API key, no card: https://fundfactsapi.com/signup - Documentation: https://fundfactsapi.com/docs (OpenAPI: https://fundfactsapi.com/openapi.json) - MCP server: https://fundfactsapi.com/api/mcp (set-up for every client: https://fundfactsapi.com/mcp-server) - Pricing: https://fundfactsapi.com/pricing - Site index for AI assistants: https://fundfactsapi.com/llms.txt - Informational data, not investment advice.