Axle Energy

Axle Energy operates a virtual power plant (VPP) platform that connects distributed energy assets — electric vehicles, EV chargers, home batteries, and heat pumps — to electricity flexibility markets through a single unified API. Partners (carmakers, charger and battery OEMs, HVAC suppliers, and utilities) register sites and assets, prequalify and enrol them in flex propositions, stream telemetry and plug/charge events, and let end users monetise shiftable demand. The API covers authentication, meter lookup (MPAN), sites, assets, telemetry/readings, rewards/payouts, validation, and half-hourly price curves, with markets live across Great Britain, France, Germany, the Netherlands, Denmark and Sweden. React/hosted UI components and a documented outbound dispatch webhook round out the developer surface.

Axle Energy publishes 8 APIs on the APIs.io network, including 1. Authentication API, 2. Meters API, 3. Sites API, and 5 more. Tagged areas include Company, Energy, Flexibility, Virtual Power Plant, and Electric Vehicles.

The Axle Energy catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Axle Energy’s developer surface includes documentation, API reference, getting-started guide, engineering blog, support, authentication, and 16 more developer resources.

🌐 Visit website 📡 Source on GitHub

43.9/100 developing ▬ flat Agent 34/100 agent ready Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessSelf serve

1 APIs

Company Energy Flexibility Virtual Power Plant Electric Vehicles Smart Charging Batteries Demand Response Grid Sustainability

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 43.9/100 · developing

Contract Quality 11.3 / 19

Developer Ergonomics 11.0 / 15

Access Clarity 0.0 / 15

Operational Transparency 1.8 / 10

Contract Governance 0.4 / 9

Discoverability 5.7 / 8

Regulatory Posture 3.5 / 15

Create-or-Update Ergonomics 3.9 / 10

Agent readiness — 34/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 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

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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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 github.com/api-evangelist/axle-energy: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 8

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

Axle Energy 1. Authentication API

Authenticate yourself with the Axle API

Axle Energy 2. Meters API

Find key info about your sites

Axle Energy 3. Sites API

Axle Energy 4. Assets API

Axle Energy 5. Data API

Send asset metrics to Axle, for analysis and optimisation purposes

Axle Energy 6. Rewards API

Determine how much your users have earned by participating with Axle; allow balance withdrawal

Axle Energy 7. Validation API

Validate structured data against Axle's rules

Axle Energy 8. Examples API

Get example data for testing

Scroll for all 8

Open Collections 9

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Axle 1. Authentication API

OPEN COLLECTION

Axle 1. Authentication 2. Meters API

OPEN COLLECTION

Axle 1. Authentication 3. Sites API

OPEN COLLECTION

Axle 1. Authentication 4. Assets API

OPEN COLLECTION

Axle 1. Authentication 5. Data API

OPEN COLLECTION

Axle 1. Authentication 6. Rewards API

OPEN COLLECTION

Axle 1. Authentication 7. Validation API

OPEN COLLECTION

Axle 1. Authentication 8. Examples API

OPEN COLLECTION

Scroll for all 9

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Axle Energy Dispatch Webhooks

ASYNCAPI

Security Posture 2

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

Axle Energy Authentication

oauth2 · 1 scheme

SECURITY

Axle Energy Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Axle Energy Agentic Access

55 operations · 32 acting · 2 human-in-the-loop

55 operations · 32 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate

AgentSkill

LLMsTxt

WellKnown

AgenticAccess

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Idempotency

Idempotency

Lifecycle

Lifecycle

Components

Components

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

Support

Support

Deprecation

Deprecation

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: axle-energy
name: Axle Energy
description: Axle Energy operates a virtual power plant (VPP) platform that connects distributed energy assets — electric
  vehicles, EV chargers, home batteries, and heat pumps — to electricity flexibility markets through a single unified API.
  Partners (carmakers, charger and battery OEMs, HVAC suppliers, and utilities) register sites and assets, prequalify and
  enrol them in flex propositions, stream telemetry and plug/charge events, and let end users monetise shiftable demand. The
  API covers authentication, meter lookup (MPAN), sites, assets, telemetry/readings, rewards/payouts, validation, and half-hourly
  price curves, with markets live across Great Britain, France, Germany, the Netherlands, Denmark and Sweden. React/hosted
  UI components and a documented outbound dispatch webhook round out the developer surface.
url: https://raw.githubusercontent.com/api-evangelist/axle-energy/refs/heads/main/apis.yml
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://cdn.prod.website-files.com/6706a319ca966248529c44be/6a4dc6c17d68be5261e80f8d_OG.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- accel
x-tier: enriched
x-tier-reason: live-openapi-and-developer-surface
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Energy
- Flexibility
- Virtual Power Plant
- Electric Vehicles
- Smart Charging
- Batteries
- Demand Response
- Grid
- Sustainability
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- aid: axle-energy:axle-energy-1-authentication-api
  name: Axle Energy 1. Authentication API
  description: Authenticate yourself with the Axle API
  humanURL: https://docs.axle.energy/introduction
  baseURL: https://api.axle.energy
  tags:
  - 1. Authentication
  properties:
  - type: OpenAPI
    url: openapi/axle-energy-1-authentication-api-openapi.yml
  - type: ErrorCatalog
    url: errors/axle-energy-problem-types.yml
  - type: DataModel
    url: data-model/axle-energy-data-model.yml
  - type: Sandbox
    url: sandbox/axle-energy-sandbox.yml
  - type: Conventions
    url: conventions/axle-energy-conventions.yml
  - type: Conformance
    url: conformance/axle-energy-conformance.yml
  - type: Webhooks
    url: asyncapi/axle-energy-dispatch-webhooks.yml
- aid: axle-energy:axle-energy-2-meters-api
  name: Axle Energy 2. Meters API
  description: Find key info about your sites
  humanURL: https://docs.axle.energy/introduction
  baseURL: https://api.axle.energy
  tags:
  - 2. Meters
  properties:
  - type: OpenAPI
    url: openapi/axle-energy-2-meters-api-openapi.yml
  - type: ErrorCatalog
    url: errors/axle-energy-problem-types.yml
  - type: DataModel
    url: data-model/axle-energy-data-model.yml
  - type: Sandbox
    url: sandbox/axle-energy-sandbox.yml
  - type: Conventions
    url: conventions/axle-energy-conventions.yml
  - type: Conformance
    url: conformance/axle-energy-conformance.yml
  - type: Webhooks
    url: asyncapi/axle-energy-dispatch-webhooks.yml
- aid: axle-energy:axle-energy-3-sites-api
  name: Axle Energy 3. Sites API
  description: Register your sites with Axle; configure market participation
  humanURL: https://docs.axle.energy/introduction
  baseURL: https://api.axle.energy
  tags:
  - 3. Sites
  properties:
  - type: OpenAPI
    url: openapi/axle-energy-3-sites-api-openapi.yml
  - type: ErrorCatalog
    url: errors/axle-energy-problem-types.yml
  - type: DataModel
    url: data-model/axle-energy-data-model.yml
  - type: Sandbox
    url: sandbox/axle-energy-sandbox.yml
  - type: Conventions
    url: conventions/axle-energy-conventions.yml
  - type: Conformance
    url: conformance/axle-energy-conformance.yml
  - type: Webhooks
    url: asyncapi/axle-energy-dispatch-webhooks.yml
- aid: axle-energy:axle-energy-4-assets-api
  name: Axle Energy 4. Assets API
  description: Register your assets with Axle
  humanURL: https://docs.axle.energy/introduction
  baseURL: https://api.axle.energy
  tags:
  - 4. Assets
  properties:
  - type: OpenAPI
    url: openapi/axle-energy-4-assets-api-openapi.yml
  - type: ErrorCatalog
    url: errors/axle-energy-problem-types.yml
  - type: DataModel
    url: data-model/axle-energy-data-model.yml
  - type: Sandbox
    url: sandbox/axle-energy-sandbox.yml
  - type: Conventions
    url: conventions/axle-energy-conventions.yml
  - type: Conformance
    url: conformance/axle-energy-conformance.yml
  - type: Webhooks
    url: asyncapi/axle-energy-dispatch-webhooks.yml
- aid: axle-energy:axle-energy-5-data-api
  name: Axle Energy 5. Data API
  description: Send asset metrics to Axle, for analysis and optimisation purposes
  humanURL: https://docs.axle.energy/introduction
  baseURL: https://api.axle.energy
  tags:
  - 5. Data
  properties:
  - type: OpenAPI
    url: openapi/axle-energy-5-data-api-openapi.yml
  - type: ErrorCatalog
    url: errors/axle-energy-problem-types.yml
  - type: DataModel
    url: data-model/axle-energy-data-model.yml
  - type: Sandbox
    url: sandbox/axle-energy-sandbox.yml
  - type: Conventions
    url: conventions/axle-energy-conventions.yml
  - type: Conformance
    url: conformance/axle-energy-conformance.yml
  - type: Webhooks
    url: asyncapi/axle-energy-dispatch-webhooks.yml
- aid: axle-energy:axle-energy-6-rewards-api
  name: Axle Energy 6. Rewards API
  description: Determine how much your users have earned by participating with Axle; allow balance withdrawal
  humanURL: https://docs.axle.energy/introduction
  baseURL: https://api.axle.energy
  tags:
  - 6. Rewards
  properties:
  - type: OpenAPI
    url: openapi/axle-energy-6-rewards-api-openapi.yml
  - type: ErrorCatalog
    url: errors/axle-energy-problem-types.yml
  - type: DataModel
    url: data-model/axle-energy-data-model.yml
  - type: Sandbox
    url: sandbox/axle-energy-sandbox.yml
  - type: Conventions
    url: conventions/axle-energy-conventions.yml
  - type: Conformance
    url: conformance/axle-energy-conformance.yml
  - type: Webhooks
    url: asyncapi/axle-energy-dispatch-webhooks.yml
- aid: axle-energy:axle-energy-7-validation-api
  name: Axle Energy 7. Validation API
  description: Validate structured data against Axle's rules
  humanURL: https://docs.axle.energy/introduction
  baseURL: https://api.axle.energy
  tags:
  - 7. Validation
  properties:
  - type: OpenAPI
    url: openapi/axle-energy-7-validation-api-openapi.yml
  - type: ErrorCatalog
    url: errors/axle-energy-problem-types.yml
  - type: DataModel
    url: data-model/axle-energy-data-model.yml
  - type: Sandbox
    url: sandbox/axle-energy-sandbox.yml
  - type: Conventions
    url: conventions/axle-energy-conventions.yml
  - type: Conformance
    url: conformance/axle-energy-conformance.yml
  - type: Webhooks
    url: asyncapi/axle-energy-dispatch-webhooks.yml
- aid: axle-energy:axle-energy-8-examples-api
  name: Axle Energy 8. Examples API
  description: Get example data for testing
  humanURL: https://docs.axle.energy/introduction
  baseURL: https://api.axle.energy
  tags:
  - 8. Examples
  properties:
  - type: OpenAPI
    url: openapi/axle-energy-8-examples-api-openapi.yml
  - type: ErrorCatalog
    url: errors/axle-energy-problem-types.yml
  - type: DataModel
    url: data-model/axle-energy-data-model.yml
  - type: Sandbox
    url: sandbox/axle-energy-sandbox.yml
  - type: Conventions
    url: conventions/axle-energy-conventions.yml
  - type: Conformance
    url: conformance/axle-energy-conformance.yml
  - type: Webhooks
    url: asyncapi/axle-energy-dispatch-webhooks.yml
common:
- type: Overlay
  url: overlays/axle-energy-api-overlay.yaml
- type: DeveloperPortal
  url: https://docs.axle.energy/
- type: Documentation
  url: https://docs.axle.energy/introduction
- type: APIReference
  url: https://docs.axle.energy/api-reference
- type: GettingStarted
  url: https://docs.axle.energy/components/getting-started/introduction
- type: Blog
  url: https://www.axle.energy/blog
- type: GitHubOrganization
  url: https://github.com/axle-energy
- type: Support
  url: mailto:support@axle.energy
- type: Idempotency
  url: conventions/axle-energy-conventions.yml
- type: Deprecation
  url: lifecycle/axle-energy-lifecycle.yml
- type: Lifecycle
  url: lifecycle/axle-energy-lifecycle.yml
- type: Packages
  url: packages/axle-energy-packages.yml
- type: SDKs
  url: packages/axle-energy-packages.yml
- type: Components
  url: components/axle-energy-components.yml
- type: X-MCPServerCandidate
  url: mcp/axle-energy-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/axle-energy-llms.txt
- type: WellKnown
  url: well-known/axle-energy-well-known.yml
- type: DomainSecurity
  url: security/axle-energy-domain-security.yml
- type: AgenticAccess
  url: agentic-access/axle-energy-agentic-access.yml
- type: Authentication
  url: authentication/axle-energy-authentication.yml
- type: Website
  url: https://www.axle.energy/
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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