Developers

Plug assumable intelligence into your own stack.

Deciding if a loan is assumable or not is just the first part. The real work comes in cleaning the loan data across multiple sources, gathering rate information, terms, and loan type and calculating which loans are the best based on real-time prime rate changes. Don't worry, we do the heavy lifting for you, and if your brokerage has a developer, you can be live in days, not months.

Request access

Content type application/xml

<?xml version="1.0" encoding="utf-8"?>
<edmx:Edmx Version="4.0" xmlns:edmx="http://docs.oasis-open.org/odata/ns/edmx">
  <edmx:DataServices>
    <Schema Namespace="org.reso.metadata" xmlns="http://docs.oasis-open.org/odata/ns/edm">
      <EntityType Name="Property">
        <Key>
          <PropertyRef Name="ListingKey"/>
        </Key>
        <Property Name="ListingKey" Type="Edm.String" Nullable="false"/>
        <Property Name="ListingId" Type="Edm.String"/>
        <Property Name="City" Type="Edm.String"/>
        <Property Name="StateOrProvince" Type="Edm.String"/>
        <Property Name="PostalCode" Type="Edm.String"/>
        <Property Name="ListPrice" Type="Edm.Decimal"/>
        <Property Name="BedroomsTotal" Type="Edm.Int32"/>
        <Property Name="ModificationTimestamp" Type="Edm.DateTimeOffset"/>
        <Property Name="AssumableLoan" Type="org.reso.metadata.AssumableLoan"/>
        <NavigationProperty Name="Media" Type="Collection(org.reso.metadata.Media)"/>
        <!-- ...additional RESO Data Dictionary 2.0 fields omitted for brevity... -->
      </EntityType>
      <!-- ...ComplexType definitions for AssumableLoan, Media, plus EntityContainer omitted... -->
    </Schema>
  </edmx:DataServices>
</edmx:Edmx>

Accessing assumable intelligence

1 Check one address

Look up a single property and get its assumable loan fields back.
2 Sync your whole book

Pull every listing in your brokerage and keep it current.
3 Subscribe to changes

Hear about changes as they happen, instead of polling for them.

Built on industry standard RESO

We authored the Assumable Loan standard, which ships in RESO v2.2. Endpoints are RESO-compliant OData, so if your team has worked with an MLS feed, this will look familiar.

RESO v2.2 compliant
OData endpoints
Updates in real time

Visit RESO

The standard, in full

Watch us present the Assumable Loan standard

Andy and Greg took the Assumable Loan standard to the RESO 2026 Spring Conference in San Antonio, where it was first put to the wider RESO membership. Fourteen minutes on what the standard covers and why affordability needs it.

How the standard got written