Proportunity

Proportunity is a London-based proptech/fintech mortgage lender, founded in 2016 by Vadim Toader and Stefan Boronea, that helps first-time buyers get onto the property ladder with a shared-equity loan. The Proportunity Loan supplements a buyer's deposit and can boost purchasing power by up to GBP 150,000, letting buyers secure a home with as little as a 5% deposit on any property on the market (not just new-builds). The company uses machine-learning models to forecast house prices and identify fair-valued homes in high-growth areas to reduce financing risk. Proportunity is authorised and regulated by the UK Financial Conduct Authority (FRN 716565). It was surfaced as a portfolio company of Anthemis and added to the API Evangelist network; enrichment found no public developer/API surface (consumer-facing product only).

Proportunity is profiled on the APIs.io network. Tagged areas include Company, Fintech, PropTech, Mortgage, and Real-Estate.

Proportunity’s developer surface includes engineering blog, support, and 4 more developer resources.

🌐 Visit website 📡 Source on GitHub

10.6/100 minimal ▬ flat Agent 0/100 human only saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

Company Fintech PropTech Mortgage Real-Estate Lending Homeownership Machine-Learning United Kingdom

Kin Score

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

Composite quality — 10.6/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 1.4 / 20

Access Clarity 4.2 / 20

Operational Transparency 0.0 / 13

Contract Governance 0.0 / 12

Discoverability 5.0 / 10

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

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.

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/proportunity: 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 →

Resources

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Website

Website

About

About

Blog

Blog

Source (apis.yml)

aid: proportunity
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/proportunity.png
name: Proportunity
description: Proportunity is a London-based proptech/fintech mortgage lender, founded in 2016 by Vadim Toader and Stefan Boronea,
  that helps first-time buyers get onto the property ladder with a shared-equity loan. The Proportunity Loan supplements a
  buyer's deposit and can boost purchasing power by up to GBP 150,000, letting buyers secure a home with as little as a 5%
  deposit on any property on the market (not just new-builds). The company uses machine-learning models to forecast house
  prices and identify fair-valued homes in high-growth areas to reduce financing risk. Proportunity is authorised and regulated
  by the UK Financial Conduct Authority (FRN 716565). It was surfaced as a portfolio company of Anthemis and added to the
  API Evangelist network; enrichment found no public developer/API surface (consumer-facing product only).
url: https://raw.githubusercontent.com/api-evangelist/proportunity/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- anthemis
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Fintech
- PropTech
- Mortgage
- Real-Estate
- Lending
- Homeownership
- Machine-Learning
- United Kingdom
tags_raw:
- Company
- Fintech
- Proptech
- Mortgage
- Real Estate
- Lending
- Home Ownership
- Machine Learning
- United Kingdom
apis: []
common:
- type: Website
  url: https://www.proportunity.com/
- type: About
  url: https://www.proportunity.com/about
- type: Blog
  url: https://www.proportunity.com/blog
- type: Support
  url: https://www.proportunity.com/contact
- type: TermsOfService
  url: https://www.proportunity.com/terms-and-conditions
- type: PrivacyPolicy
  url: https://www.proportunity.com/privacy-policy
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-20'
  status: minimal
  artifacts_added: 0
  pass: local-v1

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