Constantinople

Constantinople is a Sydney-based fintech providing an AI-native core-banking platform that lets banks run product, technology, data, operations, and compliance as a single modern fabric. It powers retail, business, and embedded banking across accounts, payments, cards, lending, mortgages, and term deposits, with headless APIs and SDKs, digital onboarding, an AI concierge for customers, and the "Justinian" AI workbench for bankers. Risk and compliance (fraud, financial-crime detection, regulatory reporting) are built into the platform, which is SOC 2 Type II and ISO 27001 certified. Constantinople is backed by Prosus Ventures (Series A, A$50M). The developer/API surface is a gated B2B platform; enrichment here is sourced from the company's public web presence.

Constantinople is profiled on the APIs.io network. Tagged areas include Company, Fintech, Banking, Core Banking, and Banking as a Service.

Constantinople’s developer surface includes documentation, engineering blog, support, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

18.2/100 emerging ▬ flat Agent 0/100 human only Front door AI 5/6 prominent saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs

Company Fintech Banking Core Banking Banking as a Service Embedded Finance Payments Lending

Kin Score

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

Composite quality — 18.2/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.8 / 17

Access Clarity 6.3 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 4.7 / 9

Regulatory Posture 2.8 / 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 Banking & Open Finance 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 16.7 — up to +16.7 composite points
Operational Transparency scores 0.0 — up to +13.0 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/constantinople/apis.yml: open an issue on github.com/api-evangelist/constantinople 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
Consumer Lending Licensing (UK, US, Canada credit licence registers)	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.

Security Posture 2

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

Constantinople Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Constantinople Trust Center

SOC 2 Type II, ISO 27001, ASAE 3150

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

Packages

Packages

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

TrustCenter

TrustCenter

Compliance

Compliance

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 3

The organization behind the API

Website

Website

Blog

Blog

LinkedIn

Source (apis.yml)

aid: constantinople
name: Constantinople
description: Constantinople is a Sydney-based fintech providing an AI-native core-banking platform that lets banks run product,
  technology, data, operations, and compliance as a single modern fabric. It powers retail, business, and embedded banking
  across accounts, payments, cards, lending, mortgages, and term deposits, with headless APIs and SDKs, digital onboarding,
  an AI concierge for customers, and the "Justinian" AI workbench for bankers. Risk and compliance (fraud, financial-crime
  detection, regulatory reporting) are built into the platform, which is SOC 2 Type II and ISO 27001 certified. Constantinople
  is backed by Prosus Ventures (Series A, A$50M). The developer/API surface is a gated B2B platform; enrichment here is sourced
  from the company's public web presence.
url: https://raw.githubusercontent.com/api-evangelist/constantinople/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- prosus-ventures
x-tier: stub
x-tier-reason: portfolio-lead
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:
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
image: https://a-ap.storyblok.com/f/3000014/1128x191/a976c900db/constantinople-opengraph.jpg
tags:
- Company
- Fintech
- Banking
- Core Banking
- Banking as a Service
- Embedded Finance
- Payments
- Lending
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://cxnpl.com
- type: Documentation
  url: https://www.cxnpl.com/resources/documentation
- type: Blog
  url: https://www.cxnpl.com/resources/insights
- type: Support
  url: https://www.cxnpl.com/contact-us
- type: PrivacyPolicy
  url: https://www.cxnpl.com/privacy-and-terms
- type: TermsOfService
  url: https://www.cxnpl.com/privacy-and-terms
- type: LinkedIn
  url: https://au.linkedin.com/company/cxnplio
- type: DomainSecurity
  url: security/constantinople-domain-security.yml
- type: TrustCenter
  url: security/constantinople-trust-center.yml
- type: Compliance
  url: security/constantinople-trust-center.yml
- type: Conformance
  url: conformance/constantinople-conformance.yml
- type: Packages
  url: packages/constantinople-packages.yml
- type: WellKnown
  url: well-known/constantinople-well-known.yml
- type: LLMsTxt
  url: llms/constantinople-llms.txt
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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