Retrieve historical prices

Retrieve time-series price history for a catalog item.

Use this endpoint for pricing charts, trend indicators, and historical comparison views.

Input behavior:

• Accepts item lookup via urn or slug.
• Supports a predefined range window (for example 1M).

Rules and responses:

• Returns 404 when the item cannot be resolved.
• Returns normalized series data for the resolved item across the selected range.
• Short-lived caching is applied to improve chart load times.