HALOWERK medienwerk — Engineering Performance Literal Index Snapshot Compare

Use this endpoint when you need a precise, literal diff between two named engineering-performance index snapshots — particularly when vocabulary fidelity matters and you want exact entry-level change detection rather than semantic similarity scoring. Prefer it over generic diff tools when the index is in the HALOWERK literal-index format or when you need a structured JSON delta suitable for downstream automation.

• Missing or invalid snapshot reference returns 400 with validation error
• Snapshot data too large or malformed returns 422 unprocessable entity
• Unreachable snapshot URL (if URL-based) returns 502 or timeout
• Payment not completed or insufficient USDC balance returns 402 Payment Required
• Identical snapshots return an empty diff with no changes listed