API

API changelog

What changed in the v1 public API, newest first. Additions are backwards compatible. A breaking change would ship as a new version, listed here with its version marked.

Consuming this programmatically? GET /api/v1/changelog.json Atom feed

API v1 #

26 September 2026 #

Added

• Filter the feed to specific assets with ?asset= (by slug or id, comma-separated, and combinable with ?category=).
• The API now documents itself for tools and AI agents: a Link header pointing to the spec and docs, documented values for every field, the sell and buy reading rules, and a full example response.

Changed

• Errors now return application/problem+json (RFC 9457), keeping the existing fields so nothing breaks.
• The free feed now returns the most recent 30 days of history per asset (see seriesWindowDays). Longer and per-seller history is reserved for the paid tier.

Fixed

• Browser apps can now read the ETag and rate-limit headers and use conditional requests across origins.

28 August 2026 #

Added

• Public API launched. The free JSON feed at /api/v1/feed.json returns the best licensed seller by direction, the day's verdict, the official and global rates, and daily history, with a versioned URL, a category filter, conditional requests using ETag, a published OpenAPI contract, no key, and CORS open.

Open the OpenAPI spec