National Grid US

National Grid US is the US arm of National Grid plc, delivering electricity and natural gas in New York and Massachusetts. Its developer-facing data surface is Green Button Connect My Data: customers authorize registered third parties to receive their energy usage data, and customers can get API access (XML or JSON) to their own data, via the greenbuttonconnect.nationalgrid.com portal.

National Grid US is listed with 1 API on the APIs.io network. Tagged areas include Company, Energy, Utilities, Green Button, and Energy Data.

National Grid US’s developer surface includes signup flow, pricing, developer portal, and 6 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

12.0/100 emerging ▼ -5.8 Agent 0/100 human only Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 API

Company Energy Utilities Green Button Energy Data

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 12.0/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.4 / 17

Access Clarity 3.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.6 / 9

Regulatory Posture 1.2 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 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

MCP Tool Quality 6 / 6

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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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
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

13 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
Developer Ergonomics scores 14.3 — up to +17.1 composite points
Access Clarity scores 22.4 — up to +15.5 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/nationalgridus-com/apis.yml: open an issue on github.com/api-evangelist/nationalgridus-com 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 →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Green Button

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 1

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

National Grid Green Button Connect My Data

Customer-authorized energy usage data sharing in the Green Button Connect My Data standard (XML or JSON API, CSV/XML downloads). Third parties register with National Grid; custo...

Security Posture 1

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

Nationalgridus Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

SignUp

SignUp

Portal

Portal

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Pricing

Pricing

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: nationalgridus-com
name: National Grid US
description: 'National Grid US is the US arm of National Grid plc, delivering electricity and natural gas in New York and
  Massachusetts. Its developer-facing data surface is Green Button Connect My Data: customers authorize registered third parties
  to receive their energy usage data, and customers can get API access (XML or JSON) to their own data, via the greenbuttonconnect.nationalgrid.com
  portal.'
url: https://raw.githubusercontent.com/api-evangelist/nationalgridus-com/refs/heads/main/apis.yml
x-type: company
x-source: harvest:energy-gap
x-tier: profiled
x-tier-reason: harvest
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  probe_state: gated
  source:
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.20'
created: '2026-10-13'
modified: '2026-10-13'
tags:
- Company
- Energy
- Utilities
- Green Button
- Energy Data
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Hosts
  url: hosts/nationalgridus-com-hosts.yml
- type: Vendors
  url: vendors/nationalgridus-com-vendors.yml
- type: TermsOfService
  url: https://www.nationalgridus.com/Our-Company/Terms-Conditions
- type: SignUp
  url: https://www.nationalgridus.com/uwp_b2c/pages/register-account.json
- type: PrivacyPolicy
  url: https://www.nationalgridus.com/Our-Company/Privacy-Notice
- type: Pricing
  url: https://www.nationalgridus.com/News/2022/03/Price-of-Electricity-Coming-Down-for-National-Grid-Customers-in-Rhode-Island-
- type: DomainSecurity
  url: security/nationalgridus-com-domain-security.yml
- type: Website
  url: https://www.nationalgridus.com
- type: Portal
  url: https://greenbuttonconnect.nationalgrid.com
apis:
- aid: nationalgridus-com:green-button-connect
  name: National Grid Green Button Connect My Data
  description: Customer-authorized energy usage data sharing in the Green Button Connect My Data standard (XML or JSON API,
    CSV/XML downloads). Third parties register with National Grid; customers authorize them from their account. No public
    OpenAPI or API reference is published; the portal page markup references the UtilityAPI platform.
  humanURL: https://www.nationalgridus.com/Upstate-NY-Home/Ways-to-Save/Green-Button-Connect
  tags:
  - Green Button
  - Energy Data
  properties:
  - type: Portal
    url: https://greenbuttonconnect.nationalgrid.com
  - type: SignUp
    url: https://greenbuttonconnect.nationalgrid.com/third-party/register
  - type: Directory
    url: https://greenbuttonconnect.nationalgrid.com/directory
  - type: Documentation
    url: https://www.nationalgridus.com/MA-Home/Ways-to-Save/Green-Button-Connect
x-coverage:
  state: gated
  reason: customer-only-docs
  method: probed
  checked: '2026-10-13'
  detail: Green Button Connect My Data program exists (third-party registration and customer self-API access at greenbuttonconnect.nationalgrid.com).
    No OpenAPI, AsyncAPI, GraphQL, MCP, developer portal, or public API reference found; /docs and /api/docs 404; www.nationalgridus.com
    /developer and /greenbutton resolve to 404.aspx. Contract discovery on api/www/online/www1 hosts found nothing.
  evidence:
  - url: https://greenbuttonconnect.nationalgrid.com/
    status: 200
  - url: https://www.nationalgridus.com/developer
    status: 302
x-enrichment:
  status: enriched
  pass: local-v5
  date: '2026-10-13'

National Grid US API — frequently asked questions

Does National Grid US have an API?

Yes. APIs.io lists 1 API from National Grid US, including National Grid Green Button Connect My Data.

Is the National Grid US API ready for AI agents?

National Grid US has a Kin Score of 12.0 out of 100 (emerging) and an Agent Readiness score of 0.0 (human-only), scored by API Evangelist on 2026-11-06.

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get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
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