LoopNet API: does LoopNet have an API? (2026)

Does LoopNet have an API? No — LoopNet doesn’t offer a self-serve public API for third-party developers. LoopNet is a commercial real estate (CRE) listing marketplace owned by CoStar Group, and programmatic access to CoStar’s data lives behind its enterprise products, not a developer signup page.

If you’re building software that needs commercial property data — office, retail, industrial, land listings — this page covers what access actually looks like in 2026, and where a productized residential-focused API like Zillapi does and doesn’t fit.

What exists today

• No public LoopNet API. There’s no documented endpoint, no API key signup, no rate-limited free tier for developers who want to pull LoopNet listings directly.
• CoStar Group’s enterprise data products (CoStar Suite, CoStar Real Estate Manager, and related tools) are the licensed route into CoStar/LoopNet-adjacent commercial real estate data. These are enterprise sales-led products — expect a sales process, contracts, and pricing that isn’t published.
• Other CRE data vendors exist as alternatives for teams that specifically need commercial-listing data: platforms like Crexi and CRE-focused data providers offer varying levels of programmatic access. Evaluate those directly against your CRE use case — this isn’t something Zillapi covers.
• Unofficial scraping of LoopNet carries the same problems as scraping any commercial site without a public API: fragile selectors, no schema guarantees, and ToS exposure.

Why doesn’t LoopNet offer a self-serve API?

CoStar Group’s business is built on licensing commercial real estate data and analytics to brokerages, lenders, and institutional investors at enterprise prices. LoopNet listings and CoStar’s underlying comps/analytics are the asset those contracts are sold against — a free or cheap public API would undercut that revenue model. That’s consistent with how most CRE data stays gated behind relationship-driven sales rather than developer self-signup: the buyers are large firms who can absorb enterprise pricing, not indie developers, so there’s little commercial incentive to build a public API tier.

The honest fit with Zillapi

Be direct about this: LoopNet is commercial real estate. Zillapi is a residential-focused, Zillow-sourced property data API. These are different property universes. Zillapi does not provide CRE listings — no office buildings, no industrial space, no retail pads, no land parcels marketed for commercial lease or sale. If your product needs LoopNet’s specific inventory or CoStar’s CRE analytics, Zillapi is not a substitute, and we’re not going to pretend otherwise.

Where Zillapi is a legitimate fit: if your developer intent behind searching “LoopNet API” is actually “I need U.S. property data through a REST API” more broadly — and your product touches residential or mixed-use properties (homes, condos, small multi-family) rather than pure CRE — the Zillow API gives you structured data (price, Zestimate-style valuation, photos, schools, tax history, price history — 300+ fields, 160M+ U.S. parcels) same-day, with no scraping and no enterprise sales cycle. It’s the right tool for the residential side of a property-data build, not a CRE-listings replacement.

When to actually look elsewhere: if your product is an investor deal-sourcing tool for office/industrial/retail assets, a CRE brokerage CRM, or anything that needs cap rates, tenant rosters, or commercial comps — go to CoStar’s enterprise products or a dedicated CRE data vendor. Building on Zillapi for that use case would mean shipping a product with no actual commercial-listing coverage, which isn’t a fit worth forcing.

Where Zillapi does fit alongside CRE tooling: teams building mixed real-estate platforms sometimes need both — CRE data from a licensed vendor for commercial assets, and residential data for the rest of the market. Zillapi can be the residential leg of that stack without requiring an enterprise contract to get started.

How to pull U.S. residential property data with one REST call

No scraping, no proxy farm, no rotating DOM. Zillapi handles proxy rotation, captcha, schema normalization, retries, and 24-hour caching behind one API call.

# Single property by its Zillow URL (1 credit per record)
curl https://api.zillapi.com/v1/properties/by-url \
  -H "Authorization: Bearer $ZILLOW_API_KEY" \
  --data-urlencode "url=https://www.zillow.com/homedetails/17-Zelma-Dr-Greenville-SC-29617/11026031_zpid/" -G

import os, requests
r = requests.get(
    "https://api.zillapi.com/v1/properties/by-url",
    params={"url": zillow_url},
    headers={"Authorization": f"Bearer {os.environ['ZILLOW_API_KEY']}"},
    timeout=60,
)
r.raise_for_status()
print(r.json()["data"]["zpid"])

const res = await fetch(
  `https://api.zillapi.com/v1/properties/by-url?url=${encodeURIComponent(zillowUrl)}`,
  { headers: { authorization: `Bearer ${process.env.ZILLOW_API_KEY}` } }
);
const { data } = await res.json();
console.log(data.zpid, data.address, data.price);

Response shape:

{
  "data": {
    "zpid": "11026031",
    "address": { "...": "..." },
    "price": 295000,
    "bedrooms": 3,
    "zestimate": 305100,
    "rentZestimate": 1850
  },
  "request_id": "..."
}

For search-style lookups across a broader area (residential/mixed-use), Zillapi’s search endpoint returns up to 50 results per call, 1 credit each — see the search reference for filters and bounding-box options.

LoopNet vs. CoStar vs. Zillapi — property type and access

Start free

If your build needs U.S. residential property data — not CRE listings — Zillapi gets you there with one REST call, no scraping and no sales process. Start free — 100 credits, no card. Check the Quickstart to make your first call, or see pricing for the full breakdown.

Zillapi is an independent service, not affiliated with, endorsed by, or sponsored by Zillow Group, Inc. “Zillow” and “Zestimate” are trademarks of Zillow Group, Inc. “LoopNet” is a trademark of CoStar Group. All marks are used here descriptively to refer to those services. See our Trademark & Affiliation page.