Trestle RETS

Trestle's legacy Real Estate Transaction Standard interface, documented as compliant with RETS 1.8. RESO no longer updates the RETS specification, but Trestle continues to serve it for customers who cannot move to the Web API. Login is POST /trestle/rets/login; the service is session-less and supports either HTTP Basic with a Base64-encoded client_id:client_secret or an OAuth2 bearer token obtained with scope=rets. Digest authentication is explicitly not supported.

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools

Call it yourself

curl for this page
This API
curl "https://apis.io/api/v1/apis/trestle-rets"
All apis
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

A second provider on the same verified email joins the account you already have.

API entry from apis.yml

apis.yml Raw ↑
aid: trestle:trestle-rets
name: Trestle RETS
description: Trestle's legacy Real Estate Transaction Standard interface, documented as compliant with
  RETS 1.8. RESO no longer updates the RETS specification, but Trestle continues to serve it for customers
  who cannot move to the Web API. Login is POST /trestle/rets/login; the service is session-less and supports
  either HTTP Basic with a Base64-encoded client_id:client_secret or an OAuth2 bearer token obtained with
  scope=rets. Digest authentication is explicitly not supported.
humanURL: https://trestle-documentation.corelogic.com/rets.html
baseURL: https://api.cotality.com/trestle/rets
tags:
- RETS
- Legacy
- MLS
- Real-Estate
tags_raw:
- RETS
- Legacy
- MLS
- Real Estate
properties:
- type: Documentation
  url: https://trestle-documentation.corelogic.com/rets.html
- type: Documentation
  url: https://trestle-documentation.corelogic.com/rets-libraries.html
- type: Documentation
  url: https://trestle-documentation.corelogic.com/rets-connector.html