# Voltus OpenADR 2.0a VTN

**Canonical:** https://apis.io/apis/voltus/voltus-openadr-vtn/  
**Provider:** Voltus — https://apis.io/providers/voltus/  
**Base URL:** https://openadr.voltus.co  
**Documentation:** https://api.voltus.co/docs/concepts/openadr

Voltus OpenADR 2.0a VTN is one of 5 APIs that [Voltus](https://apis.io/providers/voltus/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include OpenADR, Demand Response, Standards, and Dispatch. The published artifact set on APIs.io includes API documentation, a changelog, and authentication docs.

Standards-based alternative to the REST dispatch integration. Voltus states it "supports OpenADR2.0a via Simple HTTP (PULL)" and that "Voltus provides a VTN, and our partners run one or more VENs". Partners poll https://openadr.voltus.co/vtn/YOUR_VEN_ID/OpenADR2/Simple/EiEvent (recommended once per minute) and reply with an oadrCreatedEvent acknowledgement. Authentication is mutual TLS — the partner submits a Certificate Signing Request to Voltus and presents the returned client certificate. The host is not anonymously reachable (connection refused on a bare HTTPS GET), which is consistent with an mTLS-only endpoint.

## Machine-readable artifacts (5)

- **Documentation** — https://api.voltus.co/docs/concepts/openadr
- **Tutorials** — https://api.voltus.co/docs/tutorials/openadr
- **ChangeLog** — https://api.voltus.co/docs/changelog/sandbox-openadr-support
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/voltus/refs/heads/main/authentication/voltus-authentication.yml
- **Conformance** — https://raw.githubusercontent.com/api-evangelist/voltus/refs/heads/main/conformance/voltus-conformance.yml

## Other Voltus APIs (4)

- [Voltus Dispatches API](https://apis.io/apis/voltus/voltus-dispatches-api/)
- [Voltus Sites API](https://apis.io/apis/voltus/voltus-sites-api/)
- [Voltus Telemetry API](https://apis.io/apis/voltus/voltus-telemetry-api/)
- [Voltus Webhooks API](https://apis.io/apis/voltus/voltus-webhooks-api/)

## Tags

OpenADR, Demand Response, Standards, Dispatch

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/voltus/voltus-openadr-vtn/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/voltus/.