LoopNet API
No public API, developer portal, or webhooks for listings, leads, or analytics. The sole first-party product is LoopLink, a paid embeddable widget that displays a broker's own listings. CoStar's terms prohibit scraping, and the company has repeatedly litigated against automated access.
Frequently asked questions
LoopNet scores F on the API Report Card. No public API, developer portal, or webhooks for listings, leads, or analytics. The sole first-party product is LoopLink, a paid embeddable widget that displays a broker's own listings. CoStar's terms prohibit scraping, and the company has repeatedly litigated against automated access.
Without a usable official API, teams fall back on manual exports, file drops, or one-off vendor integrations. The other option is an unofficial API layer like Supergood that automates the authenticated web app directly.
LoopNet is the largest online commercial real estate (CRE) marketplace in North America, owned and operated by CoStar Group, Inc. (NASDAQ: CSGP) since CoStar's $860M acquisition in April 2012.
Real Estate, specifically commercial real estate marketing, syndication, and lead generation. CRE brokers and listing teams log in to the LoopNet Marketing Center daily-to-weekly to post new listings, refresh photos and floor plans, update pricing and availability, manage ad-package placement and budget, respond to inbound lead inquiries, and pull view/lead/contact analytics for client reporting.
Very high in U.S. commercial real estate marketing.
For brokers and owners who pay for LoopNet, the platform holds the active listing inventory and marketing presence for properties they are trying to sell or lease, including listing photos and floor plans, marketing copy, pricing and availability, ad-package tier and spend, broker contact assignment, inquiry/lead history, view and impression analytics, saved-search trigger data, and competitor visibility on the same submarket.
Mature web marketplace, founded in 1995 and acquired by CoStar Group in April 2012 for $860M after a contested FTC review.
LoopNet does not offer a public API, brokers and owners with active paid subscriptions cannot programmatically retrieve their own listings, leads, or analytics. The only sanctioned integration is LoopLink, an embedded widget, not a real API, with no programmatic access to underlying data, leads, or events. Full sourced list under Sources below.
Common alternatives include Crexi, CommercialSearch, Showcase.com, CityFeet, 42Floors, Truss. Graded alternatives appear under "More from the report card" below.
Grades measure one thing: can a customer's engineering team get their own data out programmatically? We check six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and roll them into a letter grade. Grades get re-verified, and they only move on evidence.