{"policy":"Additive-only within /v1: existing fields never change type or meaning and are never removed; new fields may appear. Breaking changes would ship as /v2 with /v1 kept alive. Current schema version is sent on every response as X-Schema-Version.","current_version":"0.3.0","entries":[{"version":"0.3.0","date":"2026-07-12","changes":["ADD per-response provenance: as_of, source, cite","ADD free live example PINs (golden PINs) on paid routes","ADD /pricing, /changelog.json, /llms-full.txt, HTML landing","ADD X-Schema-Version header; HEAD support; ETag caching on discovery surfaces","FIX /v1/search short-query error body (was invalid_pin)"]},{"version":"0.2.0","date":"2026-07-05","changes":["ADD llms.txt, agents.txt, sitemap, robots, security.txt, favicon, /.well-known/{agent.json,mcp,mcp.json}","ADD curated /openapi.json with x-payment-info"]},{"version":"0.1.0","date":"2026-06-13","changes":["Initial public release: /v1/{search,parcel,dossier,comps} behind x402; /v1/sample free; A2A card; x402 resource list"]}]}