# Green Button Third Party (OpenESPI) API

**Canonical:** https://apis.io/apis/green-button-alliance/green-button-third-party-api/  
**Provider:** Green Button Alliance — https://apis.io/providers/green-button-alliance/  
**Base URL:** https://services.greenbuttondata.org/ThirdParty  
**Documentation:** https://greenbuttonalliance.github.io/OpenESPI-GreenButton-API-Documentation/ThirdParty/

Green Button Third Party (OpenESPI) API is one of 3 APIs that [Green Button Alliance](https://apis.io/providers/green-button-alliance/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Green Button, Third-Party, ESPI, Energy, and Reference Implementation. The published artifact set on APIs.io includes an API reference.

The Third Party side of the OpenESPI reference implementation — ApplicationInformation, Authorization and RetailCustomer operations documented as legacy Swagger 1.2 resource listings served from GBA's GitHub Pages site. The documented base path is https://services.greenbuttondata.org/ThirdParty, which returned HTTP 200 with an empty body on 2026-07-27. No OpenAPI 3.x definition of this surface was found and no live, callable service was confirmed; listed here because the documentation is genuinely published and reachable.

## Machine-readable artifacts (3)

- **APIReference** — https://greenbuttonalliance.github.io/OpenESPI-GreenButton-API-Documentation/ThirdParty/
- **Repository** — https://github.com/GreenButtonAlliance/OpenESPI-ThirdParty-java
- **Repository** — https://github.com/GreenButtonAlliance/OpenESPI-Common-java

## Other Green Button Alliance APIs (2)

- [Green Button Connect My Data (CMD) ESPI Resource Server API](https://apis.io/apis/green-button-alliance/green-button-connect-my-data-api/)
- [Green Button Alliance OpenESPI Authorization Server API](https://apis.io/apis/green-button-alliance/green-button-alliance-authorization-server-openapi/)

## Tags

Green Button, Third-Party, ESPI, Energy, Reference Implementation

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/green-button-alliance/green-button-third-party-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/green-button-alliance/.