# MLS Grid

**Canonical:** https://apis.io/providers/mls-grid/  
**Website:** https://www.mlsgrid.com/  
**APIs profiled:** 1

The MLS Grid is a United States MLS data-distribution cooperative created by a network of Multiple Listing Services to give brokers, MLSs and technology vendors ONE normalized data feed, ONE license agreement and ONE compliance process instead of dozens of per-MLS RETS and Web API feeds. It ingests listing data from participating MLSs, converts it to the RESO Data Dictionary, and republishes it as a single RESO Web API (OData v4) replication surface at https://api.mlsgrid.com/v2/. It sits in the middle of the residential real estate value chain, between the MLSs that own the data and the IDX/VOW sites, portals and proptech applications that display it. Its API posture is the sector archetype: the documentation is genuinely public and complete, and MLS Grid is RESO-certified for Data Dictionary 2.0 and Web API Server Core 2.0.0 in the RESO certification directory (UOI T00000045) — but nothing is reachable without credentials. Every anonymous call to the service root, to /Property and to the OData $metadata document returns HTTP 401. Access requires the MLS Grid Master Data License Agreement plus approval by each originating MLS before a long-lived OAuth 2.0 bearer token is issued in the MLS Grid web application. Certified, documented, and closed.

## Kin Score — 32.4 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 32.4).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 1.4 |
| Governance | 33.3 |
| Contract Governance | 33.3 |
| Operational Transparency | 50.0 |
| Developer Ergonomics | 38.1 |
| Commercial Clarity | 31.6 |
| Access Clarity | 31.6 |

## Agent readiness — 16.5 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | documented |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## APIs (1)

- **MLS Grid Web API v2** — MLS Grid's RESO Web API — a replication-oriented OData v4 surface over listing data normalized to the RESO Data Dictionary and pooled from the participating MLSs. Documented ent...

## Security (2)

- **Mls Grid Authentication** — http · 1 scheme
- **Mls Grid Domain Security** — TLSv1.2 · HSTS · DMARC

## Tags

Real-Estate, United States, MLS, RESO, Property Listings, IDX, PropTech, OData, Data Licensing

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/mls-grid/). Scores are computed from the provider's own public artifacts under a published rubric.