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GET /lead-sources

Scope: leads:read. Returns the catalog of valid source strings used by Make/Zapier “Create Lead” dropdowns.

Request

Response 200

The list is small and rarely changes. Cache it in your integration rather than fetching it on every request — that reduces rate-limit pressure and improves UX in dropdowns.
You can also send arbitrary strings that aren’t in this list when creating a lead — see the source field semantics note.