This is the complete guide to Eulerpool’s ISIN API: what the endpoint returns, how often it updates, and where it sits next to quotes, filings, and macro on the same key.
Everything in the Eulerpool ISIN lookup API: endpoint, fields, history depth, and how teams actually use it in production.
What the data contains
- Resolve ticker, name, ISIN, or CUSIP to a canonical security record
- 100,000+ securities across 90+ exchanges
- The missing piece when every other API only speaks US tickers
Example request
Swap US0378331005 for any listed identifier (ticker, and for many routes ISIN via search). Batch routes exist when you outgrow one-symbol GETs.
curl -H 'Authorization: Bearer YOUR_KEY' \
'https://api.eulerpool.com/v1/search'Authentication
Send Authorization: Bearer YOUR_KEY. Keys are created at register in under a minute. Official SDKs take the key in the constructor; Excel stores it in the add-in settings. There is no key-in-query-string mode — do not paste tokens into public notebooks.
Primary route for this article: /v1/search. Docs: /developers.
Coverage and freshness
Eulerpool maps 100,000+ securities across 90+ exchanges. ISIN API rides that same reference layer — identifiers resolve through ticker, name, ISIN, or CUSIP via search, so a European name is not a dead end. History depth depends on the source: prices and macro go back 100+ years, 1-minute bars to 2010, 13F to 2013.
Paid plans can stream quotes over WebSocket; the free plan uses REST with a 15-minute delay on real-time equity fields. Fundamentals, ownership, and calendars are identical on every plan. Rate-limit headers ship on every response. Batch routes (up to 100 symbols) count as one request.
How it updates
Market-data routes follow the exchange session (including pre/post for US equities). Fundamentals refresh as filings and vendor feeds land. Ownership and 13F routes update as EDGAR publishes. If a number is daily, the changelog and docs say so — we do not hide a T+2 in a footnote.
Fit versus other sources
Most teams land here after fighting Yahoo Finance scrapers, Alpha Vantage’s 25-request/day ceiling, or a Polygon bill that ignored fundamentals. Eulerpool is a licensed ISIN API with statements, estimates, filings, and macro on the same key — and a terms of service you can actually show legal.
Deep comparisons live here: vs Alpha Vantage, vs Polygon, Yahoo Finance alternative, best stock market APIs in 2026.
Who should call this
- Quant research — pandas/R dataframes, point-in-time fields, 20+ years of history where the source publishes it.
- Fintech apps — watchlists, screeners, and portfolio views without relicensing Bloomberg for every customer.
- AI agents — typed JSON and a native MCP server so models stop inventing numbers for ISIN and Ticker Search.
- Spreadsheets — the Excel and Google Sheets add-in covers the same endpoints as REST.
ISIN and Ticker Search API is one slice of the Eulerpool Financial Data API. Adjacent routes — quotes, statements, ownership, macro — use the same key, so a prototype that starts here does not hit a wall at the second dataset.
Get started
Create a free key at eulerpool.com/developers/register — no credit card, 100,000 requests/month. Then read the ISIN API docs and ship.
Every day’s drop is listed on the Financial Data API changelog. Same data powers the Eulerpool terminal 500,000+ investors already use — the API is that database with a key in front of it.