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One LEI → the full verified legal-entity record (Level-1 who-is-who): legal name, addresses, jurisdiction, legal form, registration status + honesty note, authority ids, renewal dates, BIC/ISIN-adjacent identifiers.
The 20-character Legal Entity Identifier (ISO 17442). Spaces/dashes are ignored; case-insensitive. Format + MOD-97-10 checksum are validated offline first — a malformed LEI returns a clean error with the reason, never an upstream call.
If true, also resolve the legal-form ELF code and registration-authority code to their human-readable names (2 extra cached GLEIF calls; silently skipped if unavailable).
If true, append the record's field-modification audit trail (what changed, when, old/new value) — GLEIF Level-1 history.
curl -X POST https://api.reefapi.com/lei/v1/lookup \
-H "x-api-key: $REEF_KEY" \
-H "content-type: application/json" \
-d '{"lei":"HWUPKR0MPOU8FGXBT394"}'Hit Send to run this endpoint live.