ISIN to ticker lookup

Lookup

Worked example: one ISIN, five listings

How the lookup works

1. A ticker is matched exactly, on every venue or on one.CSPX returns its London and Amsterdam lines; CSPX.L, CSPX.AS or a MIC in the API narrows it to one venue. Tickers are reused across exchanges, so a bare ticker can name several funds: each comes back with its own ISIN.
2. An ISIN returns every listing of that share class.The venue lists are keyed by ISIN, so the lookup lists each venue, MIC, ticker and trading currency the lists hold for it. A share class with no line is not exchange-traded, or is listed only on a venue outside the lists.
3. A WKN resolves through the Xetra list.Deutsche Börse publishes the WKN beside the ISIN and the mnemonic, so a six-character code that no venue lists as a ticker is tried as a WKN.
4. Each fund says whether FundFacts covers it.Covered funds have their data in the store; a fund the lists know but FundFacts never loaded is loaded by its first API request or factsheet. The lookup itself reads the store and crawls nothing.

The same lookup as JSON

GET /api/v1/resolve?ticker=CSPX&exchange=XLON

{
  "ticker": "CSPX",
  "exchange": "XLON",
  "count": 1,
  "isins": ["IE00B5BMR087"],
  "results": [
    {
      "isin": "IE00B5BMR087",
      "ticker": "CSPX",
      "mic": "XLON",
      "exchange": "London Stock Exchange",
      "currency": "USD",
      "name": "iShares Core S&P 500 UCITS ETF USD (Acc)",
      "kind": "ETP",
      "coverage": { "status": "covered", "dataAsOf": "2026-09-30", "cached": true }
    }
  ]
}