Xoserve

Xoserve Limited is the Central Data Services Provider (CDSP) for Great Britain's gas market — funded, governed and owned by the gas industry itself. From Solihull it operates the central register of every gas supply point in Britain and runs the systems the market clears through: UK Link, the Gemini transmission system, the Gas Enquiry Service, the Contact Management Service, SwitchStream and the Data Discovery Platform. It sits between the gas transporters, the independent gas transporters, the shippers and the retail suppliers under the Uniform Network Code (UNC) and the Data Services Contract (DSC), with further obligations under the Retail Energy Code. Britain mandated this data infrastructure, not a consumer data right: there is no CDR-style, consent-driven data portability obligation on Xoserve, and no Green Button or Consumer Data Standards implementation. Its API posture reflects that split exactly. Xoserve does publish a real developer portal — the Discovery API Platform, delivered by its service provider Correla at discoveryapiportal.correla.com — where four documented REST APIs (Shipper, Supplier, Meter Asset v1 and v2) expose meter-point-level information including proposed Formula Year Annual Quantity values, current supplier, network and meter asset detail. Anyone may browse that catalogue and export the OpenAPI documents anonymously, but nobody can call the gateway without being an eligible licensed GB gas industry party: every product requires a subscription AND approval, keys are issued only after a contract is countersigned, and the gateway returns 401 for everyone else. Consumer usage data is therefore reachable through a documented API, but only by accredited industry, never by a consumer or an agent acting on their behalf. On the other side, Xoserve publishes no open machine-readable market-data API at all — its public outputs are the free findmysupplier consumer lookup it operates and the Market Domain Data participant list as a spreadsheet download.

Xoserve is listed with 2 APIs on the APIs.io network: Shipper API and Supplier API. Tagged areas include Energy, United Kingdom, Gas, Utilities, and Energy Markets.

Xoserve’s developer surface includes authentication, developer portal, documentation, API reference, signup flow, pricing, getting-started guide, and 28 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

62.1/100 strong ▬ flat Agent 25/100 agent aware Front door AI 4/6 moderate saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

2 APIs 3 Agent Skills

Energy United Kingdom Gas Utilities Energy Markets Meter DataGas NetworksCentral Data Service ProviderData Services

Kin Score

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

Composite quality — 62.1/100 · strong

Contract Quality 9.1 / 21

Developer Ergonomics 11.4 / 17

Access Clarity 14.3 / 17

Operational Transparency 7.0 / 11

Contract Governance 1.9 / 10

Discoverability 5.6 / 9

Regulatory Posture 6.2 / 15

Agent readiness — 25/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 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 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 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

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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

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

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

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

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
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
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

6 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 42.6 — up to +14.4 composite points
Contract Governance scores 18.2 — up to +9.8 composite points
Developer Ergonomics scores 67.3 — up to +6.5 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/xoserve/apis.yml: open an issue on github.com/api-evangelist/xoserve 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
UK G-Cloud Suppliers (UK public-sector cloud procurement)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

Xoserve Shipper API

Bundled by Xoserve as the Supply Point Quantities service. Lets gas Shippers view the proposed Formula Year (Billing) Annual Quantity value for a meter point ahead of the late-M...

Xoserve Supplier API

Bundled by Xoserve as the Supply Point Enquiry service, part of the Gas Enquiry Service (GES). Exposes detailed supply meter point information, filtered by MPRN, address_id or p...

Open Collections 4

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

Meter Asset

OPEN COLLECTION

Meter Asset

OPEN COLLECTION

Shipper

OPEN COLLECTION

Supplier

OPEN COLLECTION

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

Enquire on a gas meter asset (v1 and v2)

AGENT SKILL

Look up Formula Year AQ and SOQ for a gas supply point

AGENT SKILL

Resolve a gas supply meter point from an address

AGENT SKILL

Xoserve API pricing

Prices published by Xoserve, read 2026-07-27 from www.xoserve.com/products-services/data-products/gas-apis/. This record is due for a re-check.

Plan	Price
Try Before You Buy (TBYB) trial	—
Supply Point Quantities contract	—
Supply Point Enquiry contract	—
Meter Asset Enquiry contract	—

Plan details, limits and sources →

Rate limits

Supply Point Quantities — Band A: 60000 api calls
Supply Point Quantities — Band B: 600000 api calls
Supply Point Quantities — Band C: 3600000 api calls

All 6 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Xoserve Plans

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Xoserve Rate Limits

6 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Xoserve

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Xoserve Finops

FINOPS

OpenAPI Overlays 4

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Xoserve Meter Asset Api V1 Overlay

4 actions · update · xoserve-meter-asset-api-v1-openapi.yml

DERIVED

Xoserve Meter Asset Api V2 Overlay

4 actions · update · xoserve-meter-asset-api-v2-openapi.yml

DERIVED

Xoserve Shipper Api Overlay

4 actions · update · xoserve-shipper-api-openapi.yml

DERIVED

Xoserve Supplier Api Overlay

4 actions · update · xoserve-supplier-api-openapi.yml

DERIVED

JSON Schema 4

Standalone JSON Schema definitions for this provider's data models.

Xoserve Meter Asset Api V1 Components

0 properties

JSON SCHEMA

Xoserve Meter Asset Api V2 Components

0 properties

JSON SCHEMA

Xoserve Shipper Api Components

0 properties

JSON SCHEMA

Xoserve Supplier Api Components

0 properties

JSON SCHEMA

Examples 4

Example request and response payloads for these APIs.

Xoserve Meter Asset Api V1 Response Example

1 fields

EXAMPLE

Xoserve Meter Asset Api V2 Response Example

1 fields

EXAMPLE

Xoserve Shipper Api Response Example

1 fields

EXAMPLE

Xoserve Supplier Api Response Example

1 fields

EXAMPLE

Security Posture 2

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

Xoserve Authentication

apiKey · 2 schemes

SECURITY

Xoserve Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Xoserve Agentic Access

4 operations

4 operations · 0 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

Portal

SignUp

GettingStarted

Sandbox

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

TechnicalSpecification

TechnicalSpecification

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate

AgenticAccess

AgentSkill

LLMsTxt

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Lifecycle

Conventions

Conformance

ErrorCatalog

DataModel

Build 2

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

ToolCrosswalk

ToolCrosswalk

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Compliance

Compliance

Operate 6

Status, limits, changes, and where to get help

Support

HelpCenter

StatusPage

ChangeLog

ChangeLog

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 4

The organization behind the API

Website

Website

Blog

Blog

LinkedIn

Website

Website

Source (apis.yml)

aid: xoserve
url: https://raw.githubusercontent.com/api-evangelist/xoserve/refs/heads/main/apis.yml
name: Xoserve
kind: company
description: 'Xoserve Limited is the Central Data Services Provider (CDSP) for Great Britain''s gas market — funded, governed
  and owned by the gas industry itself. From Solihull it operates the central register of every gas supply point in Britain
  and runs the systems the market clears through: UK Link, the Gemini transmission system, the Gas Enquiry Service, the Contact
  Management Service, SwitchStream and the Data Discovery Platform. It sits between the gas transporters, the independent
  gas transporters, the shippers and the retail suppliers under the Uniform Network Code (UNC) and the Data Services Contract
  (DSC), with further obligations under the Retail Energy Code. Britain mandated this data infrastructure, not a consumer
  data right: there is no CDR-style, consent-driven data portability obligation on Xoserve, and no Green Button or Consumer
  Data Standards implementation. Its API posture reflects that split exactly. Xoserve does publish a real developer portal
  — the Discovery API Platform, delivered by its service provider Correla at discoveryapiportal.correla.com — where four documented
  REST APIs (Shipper, Supplier, Meter Asset v1 and v2) expose meter-point-level information including proposed Formula Year
  Annual Quantity values, current supplier, network and meter asset detail. Anyone may browse that catalogue and export the
  OpenAPI documents anonymously, but nobody can call the gateway without being an eligible licensed GB gas industry party:
  every product requires a subscription AND approval, keys are issued only after a contract is countersigned, and the gateway
  returns 401 for everyone else. Consumer usage data is therefore reachable through a documented API, but only by accredited
  industry, never by a consumer or an agent acting on their behalf. On the other side, Xoserve publishes no open machine-readable
  market-data API at all — its public outputs are the free findmysupplier consumer lookup it operates and the Market Domain
  Data participant list as a spreadsheet download.'
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - plans
  - authentication
  - rate-limits
  - security
  - sandbox
  generated: '2026-11-06'
  method: derived
image: https://www.xoserve.com/assets/images/Favicons/favicon-96x96.png
tags:
- Energy
- United Kingdom
- Gas
- Utilities
- Energy Markets
- Meter Data
- Gas Networks
- Central Data Service Provider
- Data Services
created: '2026-07-27'
modified: '2026-07-27'
specificationVersion: '0.23'
apis:
- aid: xoserve:xoserve-shipper-api
  name: Xoserve Shipper API
  description: Bundled by Xoserve as the Supply Point Quantities service. Lets gas Shippers view the proposed Formula Year
    (Billing) Annual Quantity value for a meter point ahead of the late-March notification to the current Shipper, together
    with meter point and network information. A single GET operation filtered by MPRN, or by postcode combined with optional
    address detail (house_no, street, town, county, country, sub_building_name, dependent_street, dependent_local). Returns
    JSON or XML. Available to Gas Shippers only, after contract countersigning.
  humanURL: https://discoveryapiportal.correla.com/api-details#api=shipper&operation=getShipper_1
  baseURL: https://discoveryapi.correla.com/shipper/v1
  tags:
  - Gas
  - Supply Point
  - Annual Quantity
  - Energy Markets
  properties:
  - type: OpenAPI
    url: openapi/xoserve-shipper-api-openapi.yml
  - type: Overlay
    name: API Evangelist overlay — reconstitutes the operation, parameters and schemas Azure APIM strips from the anonymous
      export
    url: overlays/xoserve-shipper-api-overlay.yaml
  - type: JSONSchema
    name: Provider-published component schemas
    url: json-schema/xoserve-shipper-api-components.json
  - type: Examples
    name: Provider-published response example
    url: examples/xoserve-shipper-api-response-example.json
  - type: AgentSkill
    url: skills/xoserve-lookup-supply-point-quantities.md
  - type: APIReference
    url: https://discoveryapiportal.correla.com/api-details#api=shipper&operation=getShipper_1
  - type: Documentation
    url: https://www.xoserve.com/products-services/data-products/gas-apis/
  - type: Portal
    url: https://discoveryapiportal.correla.com/
  - type: SignUp
    url: https://discoveryapiportal.correla.com/signin
  - type: Pricing
    url: https://www.xoserve.com/media/7975/xoserve-try-before-you-buy-api-service-subscription-guide.pdf
- aid: xoserve:xoserve-supplier-api
  name: Xoserve Supplier API
  description: Bundled by Xoserve as the Supply Point Enquiry service, part of the Gas Enquiry Service (GES). Exposes detailed
    supply meter point information, filtered by MPRN, address_id or postcode combined with optional address detail. Aimed
    at organisations working to improve change-of-supply and data assurance processes. Access is arranged through the Retail
    Energy Code Company (RECCo), not directly with Xoserve.
  humanURL: https://discoveryapiportal.correla.com/api-details#api=supplier&operation=getSupplier_1
  baseURL: https://discoveryapi.correla.com/supplier/v1
  tags:
  - Gas
  - Supply Point
  - Switching
  - Retail Energy Code
  properties:
  - type: OpenAPI
    url: openapi/xoserve-supplier-api-openapi.yml
  - type: Overlay
    name: API Evangelist overlay — reconstitutes the operation, parameters and schemas Azure APIM strips from the anonymous
      export
    url: overlays/xoserve-supplier-api-overlay.yaml
  - type: JSONSchema
    name: Provider-published component schemas
    url: json-schema/xoserve-supplier-api-components.json
  - type: Examples
    name: Provider-published response example
    url: examples/xoserve-supplier-api-response-example.json
  - type: AgentSkill
    url: skills/xoserve-resolve-supply-point-from-address.md
  - type: APIReference
    url: https://discoveryapiportal.correla.com/api-details#api=supplier&operation=getSupplier_1
  - type: Documentation
    url: https://www.xoserve.com/products-services/data-products/gas-apis/
  - type: Documentation
    url: https://www.xoserve.com/products-services/data-products/gas-enquiry-service-ges/
  - type: Portal
    url: https://discoveryapiportal.correla.com/
  - type: SignUp
    url: https://discoveryapiportal.correla.com/signin
common:
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/xoserve/overview
- type: DomainSecurity
  url: security/xoserve-domain-security.yml
- type: Authentication
  url: authentication/xoserve-authentication.yml
- type: Website
  url: https://www.xoserve.com/
- type: Portal
  url: https://discoveryapiportal.correla.com/
- type: Documentation
  url: https://www.xoserve.com/products-services/data-products/gas-apis/
- type: APIReference
  name: Discovery API Platform catalogue
  url: https://discoveryapiportal.correla.com/apis
- type: SignUp
  url: https://discoveryapiportal.correla.com/signin
- type: Pricing
  url: https://www.xoserve.com/products-services/data-products/gas-apis/
- type: GettingStarted
  url: https://www.xoserve.com/media/7975/xoserve-try-before-you-buy-api-service-subscription-guide.pdf
- type: Blog
  url: https://www.xoserve.com/news/
- type: LinkedIn
  url: https://www.linkedin.com/company/xoserve/
- type: Support
  url: https://www.xoserve.com/help-and-support/
- type: HelpCenter
  url: https://www.xoserve.com/help-and-support/raise-a-new-support-request/
- type: TermsOfService
  url: https://www.xoserve.com/terms-and-conditions/
- type: PrivacyPolicy
  url: https://www.xoserve.com/privacy-notice/
- type: Compliance
  url: https://www.xoserve.com/about-us/
- type: StatusPage
  url: https://www.xoserve.com/news-updates/news-and-updates/planned-outages/
- type: ChangeLog
  url: https://www.xoserve.com/change/uk-link-releases/
- type: ChangeLog
  name: Xoserve UK Link release programme (structured)
  url: changelog/xoserve-changelog.yml
- type: Lifecycle
  url: lifecycle/xoserve-lifecycle.yml
- type: Conventions
  url: conventions/xoserve-conventions.yml
- type: Conformance
  url: conformance/xoserve-conformance.yml
- type: ErrorCatalog
  url: errors/xoserve-problem-types.yml
- type: DataModel
  url: data-model/xoserve-data-model.yml
- type: Sandbox
  url: sandbox/xoserve-sandbox.yml
- type: Plans
  url: plans/xoserve-plans.yml
- type: RateLimits
  url: rate-limits/xoserve-rate-limits.yml
- type: X-MCPServerCandidate
  name: Xoserve MCP server (derived candidate — no official server exists)
  url: mcp/xoserve-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: ToolCrosswalk
  url: mcp/xoserve-tool-crosswalk.yml
- type: AgenticAccess
  url: agentic-access/xoserve-agentic-access.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/xoserve-llms.txt
- type: TechnicalSpecification
  name: Supply Point Quantities API Technical Specification
  url: https://discoveryapiportal.correla.com/api-details#api=shipper&operation=getShipper_1
- type: Website
  name: findmysupplier — free consumer gas supplier lookup operated by Xoserve
  url: https://www.findmysupplier.energy/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Xoserve API — frequently asked questions

Does Xoserve have an API?

Yes. APIs.io lists 2 APIs from Xoserve, including Xoserve Shipper API and Xoserve Supplier API.

Is there an OpenAPI specification for the Xoserve API?

Yes. APIs.io indexes 2 OpenAPI specifications for Xoserve, each linked for download from this page.

How do I authenticate with the Xoserve API?

Xoserve uses bearer-token authentication (apiKey · 2 schemes). The details are profiled on APIs.io as Xoserve Authentication.

How much does the Xoserve API cost?

APIs.io lists 4 pricing plans for Xoserve, with each plan's price, limits and inclusions under Pricing on this page.

Is the Xoserve API ready for AI agents?

Xoserve has a Kin Score of 62.1 out of 100 (strong) and an Agent Readiness score of 24.8 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
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.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/xoserve"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/xoserve/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/xoserve/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.