External food lookup cascade (API key, rate-limited)

GET /foods/lookup · API key required

Local cache → USDA FDC (name search) → Open Food Facts (barcode) → FatSecret barcode lookup (Premier-exclusive) → FatSecret (name search). First external hit is cached into external_foods_cache so subsequent lookups skip upstream calls.

Parameters

• q (query) - Name search (tries USDA, then FatSecret).
• barcode (query) - Barcode lookup (Open Food Facts, then FatSecret).
• offset (query)

Responses

• 200
• 429

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