GET /brands/prefix find canonical brand names matching a prefix.
Send Authorization: Bearer <your-platform-api-key> with every request. POST requests also require Content-Type: application/json. Use the base URL https://api.storerouter.ai/v1.
Query parameters: required prefix (1–100 characters after trimming), and optional limit (1–50, default 20).
503 with brand_search_unavailable when the search backend is unavailable.
See Discover brands for brand-versus-store semantics, catalog scope, filter rules, MCP equivalents, and shared authorization, validation, and rate-limit errors.