LEI lookup API (GLEIF) — resolve and search Legal Entity Identifiers
A guide to resolving and searching Legal Entity Identifiers (LEIs) through one REST endpoint. An LEI is a 20-character ISO 17442 code that uniquely identifies a legal entity in the global GLEIF register. Prometiam's Risk API wraps GLEIF so you can look up a known LEI or resolve a company name to candidate LEIs with a single Bearer key.
What the guide covers
- What an LEI is — the ISO 17442 standard, the 20-character structure (LOU prefix, entity block, checksum), and why regulators require it.
GET /lei/{lei} — resolve a known 20-char LEI to legal name, jurisdiction, registration status, and headquarters address from the GLEIF Global LEI Index (188K+ entities).
GET /lei/search?name= — resolve a company name to candidate LEIs when you do not already have the code.
- When KYB and regulatory reporting (EMIR, MiFID II, MiFIR, Dodd-Frank) need an LEI, plus copy-paste Python and JavaScript examples.
Runs on the free tier (1,000 calls/month, no credit card). The same key covers Spain, France, the UK, Ireland, and Poland, plus sanctions + US export-control screening, VIES VAT validation, and corporate-event timelines.
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