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Overview

Momentum provides several types of public API:s which aggregates and deliveres information from several backend systems, for example Momentum Fastighet, Momentum Login and Momentum Files.

Communication

Please follow our Release notes where we notify you about breaking changes to our APIs. Breaking changes are also documented on the Breaking changes page. Breaking changes (except those necessary for bugfixes) are notified via release notes and documented on the Breaking changes page 6 months prior to being rolled out.

Frequently Asked Questions

Please check out our Frequently Asked Questions page for answers on questions asked by other customers.

Fastighet API

The Momentum Fastighet API is an open web api, and is used mainly to support the Momentum Fastighet Mina sidor application and similiar applications.

The API currently provides functions mainly targeted for features directly involving the end-customer, meaning, it typically only returns information directly related to the current signed-in customer and does not typically makes it possible to submit or query for example errands for other/all customers.

GraphQL

The Momentum Fastighet GraphQL API can be used to query information stored in Momentum Fastighet using the GraphQL query language.

This API is indended to be called by services. Public client applications (e g SPA or native mobile apps) used by customers should not call the GraphQL API directly since the API does not implement permissions checks that limit the returned data to only the data the signed-in customer should typically have access to. It is therefore necessary to build an API gateway that receives call from your public client application, performs security checks and then makes the appropriate query to the GraphQL API.

FastAPI

The FastAPI is a standard used in communication between real estate systems and other systems.