aid: housesigma url: https://raw.githubusercontent.com/api-evangelist/housesigma/refs/heads/main/apis.yml name: HouseSigma kind: company description: 'HouseSigma, Inc. Brokerage is a Toronto-based Canadian residential real estate portal and licensed brokerage that pairs map-based MLS listing search with sold-price history and machine-learning home valuations (SigmaEstimate) across Ontario, British Columbia, and Alberta. It sits in the challenger layer of the Canadian value chain, below CREA, which operates REALTOR.ca and the national Data Distribution Facility (DDF) that syndicates member boards'' listings, and alongside Wahi, Zolo, and Properly, competing on visibility into data the boards control, a position it won in part through the Competition Bureau litigation that forced TRREB to release sold data in 2018. Its API posture is closed. There is no developer portal, no published API program, and no partner or data-licensing page; developer., developers., and docs.housesigma.com do not resolve in DNS, and /developers, /api, /api-docs, /openapi.json and /swagger.json all return the single-page-application shell rather than any contract. The listing, sold-history and valuation backend at housesigma.com/bkv2/api/ is private, keyless, undocumented, and explicitly disallowed to all crawlers in robots.txt. The one genuinely public, anonymously callable, machine-readable HTTP surface the company operates is the WordPress REST API behind housesigma.com/blog-en, which serves its Canadian housing-market analysis blog as JSON across 157 advertised routes; API Evangelist derived an OpenAPI for the 22 operations verified to answer anonymously. HouseSigma also publishes a real llms.txt and mobile deep-link association documents. RESO is absent: HouseSigma is not among the Canadian organizations RESO lists as members, and no Web API or Data Dictionary certification, OData $metadata document, or Universal Property Identifier usage was found. No open, unlicensed dataset is published. The underlying listing and sold data is board-licensed and reaches HouseSigma through its own brokerage membership, not through anything a third-party developer can sign up for.' image: https://housesigma.com/apple-touch-icon.png?v=2 tags: - Real Estate - Canada - Property Listings - MLS - Valuation - AVM - PropTech - Rentals - Blog - Content - WordPress - oEmbed - Ontario - British Columbia - Toronto created: '2026-07-26' modified: '2026-07-26' specificationVersion: '0.19' apis: - name: HouseSigma Blog Content API description: 'The public, read-only WordPress REST API (wp/v2) behind housesigma.com/blog-en, which serves HouseSigma''s Canadian housing-market analysis blog as JSON. This is the only anonymously callable, machine-readable HTTP surface HouseSigma operates: 157 routes across 8 namespaces are advertised by the live route-discovery document at https://housesigma.com/blog-en/wp-json/ (HTTP 200), of which 22 GET operations - posts, pages, media, categories, tags, authors, comments, search, the type/taxonomy/status registry, and oEmbed - were verified to answer without credentials. Page-number pagination with X-WP-Total / X-WP-TotalPages / RFC 8288 Link headers; errors use the WordPress {code,message,data.status} envelope rather than RFC 9457. It is NOT an official HouseSigma developer product: the company documents, supports and issues keys for nothing, and its listing, sold-price and SigmaEstimate valuation data is served only by the private, robots-disallowed /bkv2/api/ backend, which is deliberately not listed here.' humanURL: https://housesigma.com/blog-en/ baseURL: https://housesigma.com/blog-en/wp-json tags: - Blog - Content - Real Estate - Canada - WordPress - oEmbed properties: - type: OpenAPI url: openapi/housesigma-blog-content-openapi.yml - type: Overlay url: overlays/housesigma-blog-content-overlay.yaml - type: Examples url: examples/ - type: ErrorCatalog url: errors/housesigma-problem-types.yml - type: DataModel url: data-model/housesigma-data-model.yml - type: Conventions url: conventions/housesigma-conventions.yml common: - type: AgenticAccess url: agentic-access/housesigma-agentic-access.yml - type: DomainSecurity url: security/housesigma-domain-security.yml - type: Authentication url: authentication/housesigma-authentication.yml - type: Website url: https://housesigma.com/ - type: Blog url: https://housesigma.com/blog-en/ - type: BlogRSS url: https://housesigma.com/blog-en/feed/ - type: GitHubOrganization url: https://github.com/housesigma - type: LinkedIn url: https://www.linkedin.com/company/housesigma - type: LLMsTxt url: llms/housesigma-llms.txt - type: WellKnown url: well-known/housesigma-well-known.yml - type: Conventions url: conventions/housesigma-conventions.yml - type: ErrorCatalog url: errors/housesigma-problem-types.yml - type: Lifecycle url: lifecycle/housesigma-lifecycle.yml - type: Conformance url: conformance/housesigma-conformance.yml - type: DataModel url: data-model/housesigma-data-model.yml - type: Components url: components/housesigma-components.yml - type: AgentSkill url: skills/_index.yml - type: Examples url: examples/ - type: Overlay url: overlays/housesigma-blog-content-overlay.yaml - type: TermsOfService url: https://housesigma.com/blog-en/2018/04/25/terms-of-use/ - type: PrivacyPolicy url: https://housesigma.com/blog-en/2018/04/25/privacy-policy/ - type: Support url: https://housesigma.com/blog-en/contact-us/ - type: FAQ url: https://housesigma.com/blog-en/faq/ - type: About url: https://housesigma.com/blog-en/about-us/ - type: Careers url: https://team.housesigma.com/ - type: iOSApp url: https://itunes.apple.com/ca/app/toronto-real-estate-housesigma/id1255490256?mt=8 - type: AndroidApp url: https://play.google.com/store/apps/details?id=com.housesigma.android&hl=en_CA - type: Facebook url: https://www.facebook.com/housesigma/ - type: Instagram url: https://www.instagram.com/housesigma/ maintainers: - FN: Kin Lane email: kin@apievangelist.com