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RESO Web API via MLS Grid

OneKey MLS listings, on the site you already have.

OneKey MLS delivers its feed through MLS Grid. We sync it into your WordPress, Laravel or custom site and keep it current every 2 to 3 hours.

Book the feed audit How the switch works
Region
New York City
Protocol
RESO Web API via MLS Grid
Refresh, configurable
2 to 3 h
MLS Grid handshakeIllustration, not a live connection
  1. Authorization: Bearer {token}
    Issued once access is approved.
  2. $filter=MlgCanView eq true
    On the first load only.
  3. $expand=Media
    Downloaded and stored.
  4. ModificationTimestamp gt {last}
    Only what changed since the last run.
  5. MlgCanView eq false
    Those listings come off the site.
An MLS Grid bearer token, issued once OneKey MLS approves the subscription.
The gap

Long Island to the Hudson Valley, on one feed.

OneKey covers a wide, varied market, and MLS Grid has strict rules on photos and removals. Plugins that skip those rules show the wrong listings, and the fix offered is usually a new site. We have synced this board's feed before, on a multi MLS platform we built and ran from 2018 to 2025.

  • Active listingsPending and coming soon included, refreshed every 2 to 3 hours.
  • SoldsSynced on their own schedule, scoped to your office by default.
  • Agent and office rostersFrom the feed, or built from listings when there is no roster access.
  • Open housesSynced and attached to their listings.
  • Photos and virtual toursCarried through and served from an image CDN with resizing.
  • Map searchBox, drawn polygon, radius and neighborhood, with pin clustering.
The board

What OneKey MLS is

OneKey MLS is the regional MLS for New York City, Long Island and the Hudson Valley, based in Farmingdale, New York. Its own About page calls it New York State's largest MLS.

For websites it offers Matrix Data Link embeds, IDX and VOW feeds, and back office feeds, including a feed of a broker's own listings with no usage restrictions.

The feeds go out through MLS Grid, which delivers a RESO standard OneKey feed over the Web API, in the same format as the other MLS Grid markets.

The board decides which platform carries its feed. Each route has its own login, paging and limits, and its own page here.

Feed route MLS Grid OneKey MLS delivers a RESO standard feed through MLS Grid to vendors working with its brokers.
Getting access

How a OneKey broker gets a feed

OneKey sends vendors to MLS Grid. The vendor works with a OneKey broker, and the subscription needs OneKey's approval.

  1. 1

    Pick the feed

    IDX for public pages, VOW for signed in consumers, or back office for internal use.

  2. 2

    Create an MLS Grid account

    Your developer signs on with MLS Grid as the vendor working for your brokerage.

  3. 3

    Request the licence

    Add a OneKey subscription for your brokerage's data and sign MLS Grid's standard licence.

  4. 4

    OneKey approval

    OneKey reviews the subscription. Nothing is issued until it approves.

  5. 5

    Generate the token

    The API token appears in the MLS Grid portal once approved, and is stored as a server secret.

OneKey MLS sets the terms. Billing runs through MLS Grid's portal, and we did not find a fee published on OneKey's site.
What the feed carries

What the OneKey feed carries

Through MLS Grid the feed follows the RESO Web API, with MLS Grid's rules on top.

01

Resources

Property, Member, Office, OpenHouse and Lookup, with Media expanded on the record.

02

Feed types

IDX, VOW and back office, per OneKey's data delivery page. Each sets its own fields and display rules.

03

Visibility flag

MlgCanView shows whether a record may be shown. False values arrive and those listings are deleted.

04

Photos

Signed media URLs that expire, so every photo is downloaded and stored.

05

Change tracking

Pulls filter on ModificationTimestamp gt the last value seen.

06

Rate limits

MLS Grid caps requests per second, per hour and per day, so the sync is paced to stay under them.

Board rules

Rules the sync follows here.

Taken from the board's own published rules and data pages, listed under Sources above. The audit confirms the current version before anything is built.

IDX shows most, not all

OneKey says IDX sites can show listings alongside 98% of the properties for sale and rent on OneKey MLS. The sync shows what the feed allows and nothing more.

VOW needs a login

OneKey's VOW feed covers 100% of its inventory, including non public data, and consumers must log in to see it. Those pages sit behind a login.

Your own listings, no limits

OneKey offers a back office feed of a broker's own listings with no usage restrictions, separate from the full back office feed.

MlgCanView and stored photos

MLS Grid's rules apply: records that turn not viewable are deleted, and every photo is downloaded and kept.

Your stack

Into WordPress, Laravel or your own stack

WordPress

Many OneKey brokers start with the Matrix Data Link embed. Moving to a feed means a server cron job syncs listings into their own tables, and photos go to object storage behind a CDN rather than the media library.

Laravel

A rate limited queue keeps workers under MLS Grid's limits, and photo jobs run straight after each listing update. A VOW gets its own guarded routes, so non public data never reaches a public page.

Custom

Your pages read only your own database, since MLS Grid serves no on demand queries. Map search runs on the local copy, with neighborhood boundaries for a market split across boroughs and counties.

How the switch happens

Old feed stays up until the new one agrees.

Your listings never go blank. The new sync runs beside whatever feeds the site today, and we only switch when the two match.

  1. Audit

    We check your MLS Grid subscription, your platform and what the site needs to show.

  2. Run the new sync beside the old

    It fills its own tables while your current listings stay up.

  3. Compare

    Counts, statuses, photos and rosters checked against the feed.

  4. Switch and retire

    Pages read from the new sync. The Matrix Data Link embed or old plugin is removed.

Choosing a feed

Matrix Data Link, IDX, or VOW?

OneKey's Matrix Data Link is included and quick, but the search lives inside an embed. An IDX feed through MLS Grid puts the listings in your own site, under your design and your URLs.

A VOW opens all OneKey inventory, including non public data, to consumers who log in. It costs more to build and comes with stricter rules. The audit sets out which one fits.

Matrix Data LinkIncluded with the subscription. An embedded search, not your own pages.
IDX via MLS GridPublic listing pages in your own site, synced every 2 to 3 hours.
VOW via MLS GridAll inventory, including non public data, behind a consumer login.
Start here

MLS feed audit

$499credited to the integration
  • Your MLS access and feed type checked: RESO Web API, RETS, Trestle, Bridge, MLS Grid
  • Your platform, data model and hosting checked
  • Written sync plan: what syncs, how often, what shows where
  • Fixed quote for the integration
Request this package
What happens next

  1. You send the basics.

    Your site's address, what it runs on, and which MLS or feed you have access to.

  2. We check the feed and the site.

    Access, fields, photos, rosters, and how your platform stores listings.

  3. You get a written plan.

    What syncs, how often, what shows where, and a fixed price for the build.

  4. You decide.

    If you go ahead, the $499 comes off the integration.

We are an independent developer. We are not affiliated with, or certified by, any MLS or data provider named on this page.

Other boards

On a different MLS?

FAQ

Before the audit.

Through MLS Grid. A vendor working with a OneKey MLS broker signs on with MLS Grid and requests a licence for the broker's data. Access, billing and documentation run through MLS Grid's portal.
Matrix Data Link is included with the subscription and embeds a OneKey search in your site. An IDX feed puts the listings in your own database, so they render as your own pages.
On a VOW, behind a consumer login. OneKey says its VOW feed covers 100% of its inventory, including non public data. Public IDX pages follow the IDX rules.
Yes. MLS Grid requires you to keep your own copy of every photo. We store them and serve them through an image CDN with resizing.
Active listings every 2 to 3 hours, configurable, with removals deleted on the next run.
No. We are an independent developer, not affiliated with OneKey MLS or MLS Grid. The licence is between you and OneKey MLS.
You can, the first version. Many RETS era feeds were built quickly and broke over the next few years: token changes, board rule changes, photos moving hosts, purges that wiped sites. The audit tells you what you would be signing up for either way.
The feed audit is $499 and credited to the integration. The integration is quoted as a fixed price after the audit.

Find out what your feed needs.

Send the site's address and the feed you have access to. The audit gives you a written plan and a fixed quote.

Book the feed audit MLS Data Integration