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Open Finance API Standards: FDX, FAPI, OAuth2 and the Rulebooks That Move Financial Data
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One-line takeaway: regulation sets the obligation, but standards like FDX, FAPI and OAuth 2.0 / OIDC are what make open finance data actually move — here is the map you build against.
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INTRODUCTION
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Open finance is bigger than open banking: it spans banking, investments, pensions, insurance, credit and tax. Almost every open-finance regime converges on the same building blocks — OAuth 2.0 / OpenID Connect for authorisation, and FAPI-grade security on top — but each market wraps them in its own data model and consent rules. For developers and data teams planning an API integration, knowing which standard governs which market is the first design decision.
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THE SIX STANDARDS THAT MATTER
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FDX (Financial Data Exchange) — the dominant North American open-finance API standard and the leading candidate for CFPB 1033 compliance; a REST data model built on OAuth 2.0 / OIDC and FAPI.
FAPI — the OpenID Foundation's financial-grade security profile underpinning FDX, UK Open Banking, CDR and Brazil. It hardens OAuth 2.0 / OIDC for high-value data with mTLS, PAR, DPoP and dynamic client registration.
UK Open Banking Standard — the most mature implementation anywhere, run by Open Banking Limited: standardised APIs, a central directory and consent model, and the base for UK "Smart Data" open finance.
CDR Data Standards — Australia's Consumer Data Standards: the API schemas, consent flows and FAPI-based security a data holder or accredited recipient must implement.
OAuth 2.0 / OpenID Connect — the protocols that ultimately carry customer consent in every open-finance API; FAPI is what hardens them.
Berlin Group NextGenPSD2 — the widely-adopted framework for PSD2 account access and payment initiation across Europe, the de-facto counterpart to the UK's OBL standard.
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WHAT CAN BE INTEGRATED
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Once you know the governing standard, the integration surface becomes concrete:
Account and transaction data via standardised REST schemas (FDX, CDR, NextGenPSD2)
Payment initiation flows under PSD2-style frameworks
Consent and authorisation journeys on OAuth 2.0 / OIDC
High-assurance security: mTLS, PAR, DPoP, dynamic client registration per FAPI
Central-directory onboarding and client registration (UK OBL model)
Consent-based data export for apps outside official API coverage, via authorized protocol-layer analysis
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USE CASES
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[1] US fintech compliance — build against FDX now to be ready for CFPB 1033 obligations.
[2] UK Smart Data products — reuse the OBL consent model and directory to extend beyond banking.
[3] Australian accreditation — implement CDR schemas and FAPI security to operate as an accredited recipient.
[4] European account access — use NextGenPSD2 for account information and payment initiation across PSD2 markets.
[5] Emerging-market coverage — where no official API exists (much of India, Bangladesh, Pakistan, Thailand, Vietnam), commission an authorized, protocol-layer data-export integration for the specific banking, lending or investing app you need.
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WHY STANDARDS-FIRST, AUTHORIZED INTEGRATION
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Consent is built in: OAuth 2.0 / OIDC carries explicit customer authorisation, unlike credential scraping.
Security is audited: FAPI-grade profiles (mTLS, PAR, DPoP) are designed for high-value financial data.
Stability: standardised schemas change on published cycles, not silently overnight like an app UI a scraper depends on.
Coverage: where official APIs and aggregators fall short, Open Finance Studio delivers a documented, authorized data-export integration you run in your own environment.
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CONCLUSION
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Pick the standard your market dictates — FDX, UK Open Banking, CDR, NextGenPSD2 — and build on OAuth 2.0 / OIDC with FAPI security. For the apps official standards don't reach, authorized protocol-layer integration fills the gap.
Read the full standards guides and request an integration quote at:
https://openfinance-lab.com/standards/
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last updateTime: 2026-08-31 05:08:53b
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