Here are all published changelogs for the API. The dates are when the changelog was published, which may be later than the changes went live.
May 2024 - Introducing webhooks (2024-05-20)
Can not have publish featured ProjectUnits in unpublished Projects (2023-09-19)
July 2023 - Introduce Attachment endpoints (2023-07-13)
March 2023 - Updated definition for resetAllowedAfter (2023-03-01)
November 2022 - Added verified bidding provider Boostad (2022-11-03)
July 2022 - Added more fields to EnergyClassification (2022-07-19)
May 2022 - Improved descriptions on endpoints related to Projects, ProjectUnits, Featuring (2022-05-02)
December 2021 - Relax id requirement on "Mark listings as sold" (2021-12-10)
November 2021 - Document data migration process between broker systems (2021-11-15)
October 2021 - New Verified bidding provider (2021-10-05)
August 2021 - New Verified bidding providers (2021-08-25)
June 2021 - Release Verified Biddings (2021-06-30)
June 2021 - Introduce sold market state (2021-06-29)
March 2021 - Remove "Experimental" tag from Sales and Project Unit Sales (2021-03-16)
September 2020 - Introduce Project Unit's Sale endpoints (2020-09-28)
September 2020 - Energy Classification for listings and project units (2020-09-14)
August 2020 - Introduce Sale endpoints (2020-08-24)
February 2020 - Occupancy field (2020-02-12)
December 2019 - Floor field (2019-12-16)
August 2019 - Changes to rules regarding republishing of sold listings (2019-08-22)
June 2019 - New fields (2019-06-20)
March 2019 (2019-04-02)
February 2019 (2019-03-07)
January 2019 (2019-01-25)
December 2018 (2018-12-19)
November 2018 (2018-11-19)
Projects API is now stable (2018-09-28)
September 2018 (2018-09-24)
August 2018 (2018-08-30)