Kelvin (kelvin°) is a Paris-based startup, founded in 2023 and backed by Seedcamp, building an AI-powered commercial platform for the home energy-renovation industry in France. Its tools help RGE-certified artisans, renovation contractors, general contractors, CEE delegatees and trade platforms find and qualify renovation prospects, generate leads through embeddable address-based simulators, automatically compute energy-efficiency scenarios and government aids (MaPrimeRenov / CEE) with remaining customer cost, and assemble complete financing packages. The AI is trained by thermal engineers and architects and uses open data plus computer vision to assess buildings without a recent DPE. More than 4,000 artisans and sales reps use Kelvin to prospect, prepare appointments and quote work.
Kelvin publishes 1 API on the APIs.io network. Tagged areas include Company, Energy, Energy Efficiency, Home Renovation, and Construction.
Kelvin’s developer surface includes authentication, engineering blog, signup flow, documentation, API reference, support, and 10 more developer resources.
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.
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/.
REST API for kelvin's energy-renovation engine. Create a simulation from a latitude/longitude (and optionally a Base Adresse Nationale key), record the occupant's qualification ...
aid: kelvin
name: Kelvin
description: Kelvin (kelvin°) is a Paris-based startup, founded in 2023 and backed by Seedcamp, building an AI-powered commercial
platform for the home energy-renovation industry in France. Its tools help RGE-certified artisans, renovation contractors,
general contractors, CEE delegatees and trade platforms find and qualify renovation prospects, generate leads through embeddable
address-based simulators, automatically compute energy-efficiency scenarios and government aids (MaPrimeRenov / CEE) with
remaining customer cost, and assemble complete financing packages. The AI is trained by thermal engineers and architects
and uses open data plus computer vision to assess buildings without a recent DPE. More than 4,000 artisans and sales reps
use Kelvin to prospect, prepare appointments and quote work.
url: https://raw.githubusercontent.com/api-evangelist/kelvin/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- seedcamp
x-tier: profiled
x-tier-reason: 'Promoted from stub 2026-08-14: a real, live, versioned OpenAPI 3.1.0 contract (kelvin API v3, 25 operations)
was found published at https://app.go-kelvin.com/api/docs and harvested, along with v2.'
accessModel:
pricing: enterprise
onboarding: sales
trial: false
try_now: false
public: false
label: Enterprise · Requires approval
confidence: high
source:
- https://app.go-kelvin.com/api/docs
- https://www.go-kelvin.com/demo-produit
- https://www.go-kelvin.com/creer-un-compte-kelvin
note: The API reference is fully public and requires no login, but access to the API is not. No price is published anywhere
(/tarifs, /prix and /pricing all 404), there is no self-serve key issuance, and credentials are per-team keys prefixed
team-api-key- that kelvin provisions. Every commercial path funnels to a demo request or contact form. Free public calculators
exist on the marketing site but are not API access.
generated: '2026-08-14'
method: searched
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-08-14'
image: https://cdn.prod.website-files.com/6655caeb6e3835fd7ee50dd6/67a1271dde24f8ccdf843524_Kelvin-Wordmark.svg
tags:
- Company
- Energy
- Energy Efficiency
- Home Renovation
- Construction
- Artificial Intelligence
- Lead Generation
- Sales Enablement
- France
- Sustainability
apis:
- name: kelvin API
description: REST API for kelvin's energy-renovation engine. Create a simulation from a latitude/longitude (and optionally
a Base Adresse Nationale key), record the occupant's qualification profile, run kelvin's model, then read back the dwelling's
current energy performance (DPE energy and carbon letters, consumption, insulation U-values, heating and hot-water systems,
with a per-field provenance map saying whether each value came from AI, the user or a filed DPE) and a set of costed renovation
scenarios carrying MaPrimeRenov', CEE, eco-PTZ and local aid amounts plus a property-valuation KPI. Also searches published
French DPE certificates, exposes the team's own enabled catalogue of work gestures, services and price references, and
asynchronously generates the paperwork a renovation company needs - full study, CEE contribution framework, dimensioning
note, sworn statement and the commercial quote. Authenticated with a per-team bearer key prefixed team-api-key-. Current
version v3 (25 operations); v2 remains served and documented.
humanURL: https://app.go-kelvin.com/api/docs
baseURL: https://app.go-kelvin.com
tags:
- energy-efficiency
- home-renovation
- building-data
- energy-simulation
- dpe
- france
- government-incentives
- lead-generation
- document-generation
- construction
properties:
- type: Documentation
url: https://app.go-kelvin.com/api/docs
- type: APIReference
url: https://app.go-kelvin.com/api/docs
- type: OpenAPI
url: openapi/kelvin-api-openapi.yml
- type: OpenAPI
url: openapi/kelvin-api-v2-openapi.yml
- type: Overlay
url: overlays/kelvin-api-overlay.yaml
- type: Authentication
url: authentication/kelvin-authentication.yml
- type: OAuthScopes
url: scopes/kelvin-scopes.yml
- type: Conventions
url: conventions/kelvin-conventions.yml
- type: ErrorCatalog
url: errors/kelvin-problem-types.yml
- type: DataModel
url: data-model/kelvin-data-model.yml
- type: Lifecycle
url: lifecycle/kelvin-lifecycle.yml
- type: ChangeLog
url: changelog/kelvin-changelog.yml
- type: RateLimits
url: rate-limits/kelvin-rate-limits.yml
- type: Conformance
url: conformance/kelvin-conformance.yml
- type: MCPServer
url: mcp/kelvin-mcp.yml
- type: AgentSkill
url: skills/_index.yml
maintainers:
- FN: Kin Lane
email: kin@apievangelist.com
- FN: APIs.json
email: info@apis.io
common:
- type: Authentication
url: authentication/kelvin-authentication.yml
- type: Website
url: https://go-kelvin.com
- type: Blog
url: https://go-kelvin.com/ressources
- type: SignUp
url: https://go-kelvin.com/creer-un-compte-kelvin
- type: Login
url: https://app.go-kelvin.com/users/sign_in
- type: PrivacyPolicy
url: https://go-kelvin.com/gestion-des-donnees
- type: LLMsTxt
url: llms/kelvin-llms.txt
- type: DomainSecurity
url: security/kelvin-domain-security.yml
- type: DeveloperPortal
url: https://app.go-kelvin.com/api/docs
- type: Documentation
url: https://app.go-kelvin.com/api/docs
- type: APIReference
url: https://app.go-kelvin.com/api/docs
- type: Support
url: https://go-kelvin.com/demande-de-contact
- type: TermsOfService
url: https://go-kelvin.com/conditions-de-vente
- type: LegalNotice
url: https://go-kelvin.com/mentions-legales
- type: Components
url: components/kelvin-components.yml
- type: Plans
url: plans/kelvin-plans-pricing.yml
x-artifacts-without-pointer:
note: These artifacts document a verified ABSENCE. They are deliberately left unwired, because the canonical pointer asserts
the provider serves the surface and this provider does not.
files:
- path: well-known/kelvin-well-known.yml
reason: No /.well-known/ document on either host — 404 on go-kelvin.com, soft-200 HTML error page on app.go-kelvin.com.
No WellKnown or SecurityTxt pointer.
- path: packages/kelvin-packages.yml
reason: Zero first-party client libraries on any registry, and no GitHub organisation. No Packages or SDKs pointer.
x-enrichment:
date: '2026-08-14'
status: enriched
artifacts_added: 23
pass: local-v1
note: 'Contract discovery found the kelvin API. The spec is not served at any /openapi.json-style URL — every such path
on both hosts returns the Rails application error page — it is embedded as Redoc state in the docs page at https://app.go-kelvin.com/api/docs,
where a version selector exposes v3 and v2. Both were extracted verbatim. Ownership verified: info.title "kelvin API",
servers[] default host app.go-kelvin.com, bearer keys prefixed team-api-key-, and the docs URL is cited by kelvin''s own
resources pages.'
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