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 📡 Source on GitHub

22.4/100 emerging ▬ flat Agent 4/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyFintechBankingCore BankingBanking as a ServiceEmbedded FinancePaymentsLending

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 22.4/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 3.0 / 20

Commercial Clarity 7.4 / 20

Operational Transparency 0.0 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 4/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

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 4 / 4

Consent & Bot Identity 0 / 3

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/constantinople: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

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
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
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