# CoStar Group

**Canonical:** https://apis.io/providers/costar/  
**Website:** https://www.costargroup.com  
**APIs profiled:** 14

CoStar Group is the dominant commercial and residential real estate data, analytics, and marketplace company. The portfolio spans the flagship CoStar commercial real estate intelligence platform, LoopNet (CRE marketplace), Apartments.com network (residential rentals, including ForRent.com and Westside Rentals), Homes.com and Homesnap (for-sale residential), Ten-X (online CRE auctions), BizBuySell (business-for-sale marketplace), STR (hotel data), Visual Lease (lease management), Matterport (3D spatial capture), and international properties including OnTheMarket (UK), Emporis (Germany), and a controlling stake in Domain Group (Australia). Distribution to partners is via enterprise data licensing, syndication feeds, and brand-specific marketplace tooling rather than a public self-serve developer portal.

## Kin Score — 17.5 / 100 (emerging)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 17.5).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 21.1 |
| Developer Ergonomics | 0.0 |
| Commercial Clarity | 36.8 |
| Access Clarity | 36.8 |

## Agent readiness — 3.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Free — onboarding: unknown, pricing: free, trial: no (confidence: medium).

## APIs (14)

- **CoStar Commercial Real Estate Platform** — CoStar's flagship commercial real estate information platform covering property, tenant, lease, sale, and market analytics across office, industrial, retail, multifamily, and sp...
- **LoopNet** — The largest commercial real estate marketplace in the United States, surfacing CRE listings for sale and lease alongside CoStar-sourced analytics.
- **Apartments.com Network** — Residential rental marketplace network including Apartments.com, ForRent.com, and Westside Rentals, providing listings, leads, and advertising to multifamily owners and managers.
- **Homes.com** — Residential for-sale and rental marketplace operating agent-first branding and search, paired with the Homesnap mobile and agent tooling.
- **Homesnap** — Mobile residential real estate search and agent productivity application that integrates with MLSs and Homes.com.
- **Ten-X** — Online commercial real estate transaction and auction platform for buyers and sellers of CRE assets.
- **BizBuySell** — Online marketplace for buying and selling small and mid-sized businesses, with broker tools and financing partners.
- **STR (Smith Travel Research)** — Hotel benchmarking, performance data, and analytics provider serving the global lodging industry.
- **Visual Lease** — Lease management and lease accounting platform for corporate and real estate tenants.
- **Matterport** — 3D spatial data capture platform used to digitise real estate, retail, and built-environment spaces, integrated across CoStar's marketplaces.
- **OnTheMarket** — UK residential property portal acquired by CoStar Group, providing for sale and to let listings with agent tooling.
- **Emporis** — Global building data and imagery provider covering high-rise and commercial structures.
- **Domain Group** — Australian residential real estate marketplace and media company in which CoStar Group acquired a majority stake.
- **Land.com / Lands of America** — Land-for-sale marketplace network covering rural, ranch, recreational, and development land in the United States.

## Security (2)

- **Costar Domain Security** — TLSv1.3 · DMARC
- **Costar Trust Center** — SOC 2, ISO 27001, PCI DSS, GDPR

## Plans (1)

- **Costar Plans Pricing**

## Tags

Commercial Real Estate, Residential Real Estate, Real Estate Data, Marketplaces, Analytics, Listings, PropTech

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/costar/). Scores are computed from the provider's own public artifacts under a published rubric.