generated: '2026-09-19'
method: searched
source: https://iwant.fyi/protocol/v1#19-appendix-changelog + https://iwant.fyi/rss.xml + https://iwant.fyi/llms.txt + https://iwant.fyi/skill.md + https://registry.modelcontextprotocol.io/v0/servers?search=iwant
checked: '2026-09-19'
summary: >-
  Two change records exist. The protocol spec carries a dated, versioned changelog (section 19) for
  the protocol itself; the product ships version-tagged feature notes (v0.80 ... v0.94) inside
  llms.txt and skill.md, mostly undated, plus a dated RSS feed with five launch-day items and dated
  releases in the Official MCP Registry. No dedicated /changelog page (404).
scheme:
  protocol: semver, spec section 19 appendix, dated entries
  product: 'v0.NN feature tags in agent docs (undated except where noted); site footer "v 1.1.0"'
  server: 'GET /api/v1/health -> version 1.1.0'
current_version:
  protocol: '1.1'
  server: 1.1.0
  openapi_info_version: 0.20.3
  agent_card_version: 0.70.0
  mcp_registry: 1.2.0
feeds:
  rss: https://iwant.fyi/rss.xml
  agent_feed_rss: https://iwant.fyi/agents/feed/rss.xml
  probed:
  - {url: https://iwant.fyi/changelog, status: 404}
  - {url: https://iwant.fyi/rss.xml, status: 200}
entries:
- version: '1.1 P2'
  date: '2026-06-07'
  breaking: false
  kind: protocol
  highlights:
  - deterministic total order + cursor pagination (6.3)
  - well-known provenance/freshness keys in supply_metadata (6.2)
  - published JSON Schema artifacts + live GET /v1/conformance self-report (15)
- version: '1.1 P1'
  date: '2026-06-07'
  breaking: false
  kind: protocol
  highlights:
  - retryable error taxonomy — error_type + retryable + retry_after_ms, 429 / Retry-After (11.2)
  - idempotency keys — client_token on create_want / create_watch (8.4)
  - demand.capabilities tool + /v1/capabilities (8.2)
- version: '1.1'
  date: '2026-06-07'
  breaking: false
  kind: protocol
  highlights:
  - Standing Wants + signed webhook delivery — HMAC-SHA256, one-time secret, replay window, event_id dedupe, at-least-once retry, secret rotation (16)
  - partial-result transparency on the Match response — degraded + incomplete_source_count (6.1)
  - demand.create_watch / list_watches / cancel_watch tools + /v1/watches* endpoints
- version: '1.0'
  date: '2026-05-19'
  breaking: false
  kind: protocol
  highlights:
  - initial draft — Want schema, constraint vocabulary, match response, outcome events, MCP tool surface, HTTP fallback, identity, errors, versioning, privacy, security, conformance
- version: 'launch'
  date: '2026-05-19'
  kind: product
  source: https://iwant.fyi/rss.xml
  highlights:
  - 'Why I wrote a new protocol for AI-agent commerce (blog post)'
  - iwant.fyi MCP server is v1.0 conformant
  - Four official SDKs released (TypeScript + 3 Python frameworks)
  - Three open-source example agents shipped
- version: mcp-registry 1.0.0 / 1.0.1 / 1.1.0
  date: '2026-06-06'
  kind: distribution
  highlights:
  - 'Official MCP Registry listing fyi.iwant/iwant published 2026-06-06, updated 2026-06-07 (Authorization header required) and 2026-06-09 (1.1.0)'
- version: v0.80
  date: null
  kind: product
  highlights: ['Cars: demand.find_vehicle searches live dealer inventory and returns exact vehicles with VIN, dealer, distance, accident and owner history']
- version: v0.81
  date: null
  kind: product
  highlights: ['Sellers: matching wants pushed free; want-detail unlock priced in USDC on Base over x402 ($0.05 / $0.25 / $1 / $5); Stripe MPP as second rail; payments not charged during preview']
- version: v0.84
  date: null
  kind: product
  highlights: ['No key needed to search over MCP: ten demand.* tools callable without Authorization at 30/min per IP; server addable as a no-auth custom connector']
- version: v0.87
  date: null
  kind: product
  highlights: ['Introductions: demand.request_introduction emails the dealer via a per-introduction reply address; demand.introduction_status returns the answer; buyer contact details never reach the dealer']
- version: v0.94
  date: null
  kind: product
  highlights: ['demand.price_check: percentile / median / typical range for one specific car against comparable live listings; insufficient_data instead of guessing']
- version: key-prefix change
  date: '2026-09-12'
  kind: product
  breaking: false
  highlights: ['API keys now issued as fyi_ak_ (was iwant_ak_; old keys still accepted); programmatic name is "fyi" — MCP server name, agent card name, User-Agent prefix and X-Fyi-* webhook headers (X-IWantFyi-* still sent alongside)']
- version: mcp-registry 1.2.0
  date: '2026-09-12'
  kind: distribution
  highlights: ['Registry listing updated: "No key needed" — Authorization header no longer marked required']
- version: spec repo
  date: '2026-09-13'
  kind: docs
  highlights: ['staugs/iwantfyi-spec README rewritten to lead with the concrete capability (find the exact car) rather than the protocol abstraction']