OpenDTU

OpenDTU provides open-source firmware for solar inverters, enabling local monitoring and control without reliance on cloud services. The project supports ESP32-based hardware, offers a web UI, MQTT integration, and a documented Web API for retrieving inverter data, configuring settings, and managing devices. It targets DIY solar enthusiasts and small installations seeking transparent, self-hosted energy monitoring solutions.

OpenDTU publishes 1 API contract indexed on the APIs.io network. Tagged areas include solar, firmware, open-source, iot, and energy-monitoring.

The OpenDTU catalog on APIs.io includes 1 Spectral governance ruleset.

OpenDTU’s developer surface includes authentication, sandbox, documentation, API reference, support, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

22.0/100 emerging Agent 5/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract

solarfirmwareopen-sourceiotenergy-monitoring

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 22.0/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 6.9 / 17

Access Clarity 2.2 / 17

Operational Transparency 0.6 / 11

Contract Governance 2.2 / 10

Discoverability 4.9 / 9

Regulatory Posture 4.2 / 15

Agent readiness — 5/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Energy & Utilities regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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<a href="https://apis.io/providers/opendtu/"><img src="https://apis.io/badge/opendtu/card.svg" alt="OpenDTU on APIs.io — Kin Score by API Evangelist"></a>

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

11 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Access Clarity scores 13.2 — up to +17.4 composite points
Operational Transparency scores 5.3 — up to +12.3 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/opendtu/apis.yml: open an issue on github.com/api-evangelist/opendtu to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

OpenDTU API

Open Source software to talk to Hoymiles solar inverters.

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

OpenDTU API Rules

9 rules · 7 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Opendtu Authentication

1 scheme

SECURITY

Opendtu Domain Security

TLSv1.3

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Opendtu Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Get Started 2

Portal, sign-up, and the first successful call

Sandbox

Sandbox

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

Vocabulary

Lifecycle

ErrorCatalog

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: opendtu
name: OpenDTU
image: https://www.opendtu.solar/assets/images/logo.png
description: OpenDTU provides open-source firmware for solar inverters, enabling local monitoring and control without reliance
  on cloud services. The project supports ESP32-based hardware, offers a web UI, MQTT integration, and a documented Web API
  for retrieving inverter data, configuring settings, and managing devices. It targets DIY solar enthusiasts and small installations
  seeking transparent, self-hosted energy monitoring solutions.
url: https://artifacts.apis.io/opendtu/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-28 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-28'
modified: '2026-10-28'
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: Documentation exists but no OpenAPI, AsyncAPI, GraphQL, gRPC, or WSDL contract was found.
  evidence:
  - url: https://www.opendtu.solar/
    status: 200
  checked: '2026-10-28'
tags:
- solar
- firmware
- open-source
- iot
- energy-monitoring
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/opendtu-rules.yml
- type: Vocabulary
  url: vocabulary/opendtu-vocabulary.yml
- type: Authentication
  url: authentication/opendtu-authentication.yml
- type: Lifecycle
  url: lifecycle/opendtu-lifecycle.yml
- type: ErrorCatalog
  url: errors/opendtu-problem-types.yml
- type: Conformance
  url: conformance/opendtu-conformance.yml
- type: Hosts
  url: hosts/opendtu-hosts.yml
- type: Vendors
  url: vendors/opendtu-vendors.yml
- type: Sandbox
  url: https://www.opendtu.solar/firmware/configuration/console/
- type: Login
  url: https://www.opendtu.solar/firmware/configuration/login/
- type: Documentation
  url: https://github.com/tbnobody/OpenDTU-docs/raw/master/docs/index.md
- type: DomainSecurity
  url: security/opendtu-domain-security.yml
- type: Website
  url: https://www.opendtu.solar/
- type: APIReference
  url: https://www.opendtu.solar/firmware/web_api/
- type: Support
  url: https://www.opendtu.solar/#support
- type: GitHubOrganization
  url: https://github.com/tbnobody
apis:
- name: OpenDTU API
  description: Open Source software to talk to Hoymiles solar inverters.
  humanURL: https://github.com/tbnobody/OpenDTU-docs/blob/master/docs/index.md
  aid: opendtu:opendtu-api
x-submission-probe: 200, 2026-10-26
x-enrichment:
  date: '2026-10-28'
  status: enriched
  artifacts_added: 20
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

OpenDTU API — frequently asked questions

Does OpenDTU have an API?

Yes. APIs.io lists 1 API from OpenDTU, including OpenDTU API.

How do I authenticate with the OpenDTU API?

OpenDTU uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Opendtu Authentication.

Is the OpenDTU API ready for AI agents?

OpenDTU has a Kin Score of 22.0 out of 100 (emerging) and an Agent Readiness score of 5.4 (agent-aware), scored by API Evangelist on 2026-10-31.

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