TL;DR: Open banking in North and South American financial services is accelerating API-first customer experiences, but the real dependency is financial-grade APIs interacting with enterprise IAM standards, according to Ping Identity. The governance challenge is not just customer experience, but whether identity and access controls can keep pace with standards-based data sharing and trust relationships.
At a glance
What this is: This is Ping Identity's analysis of how open banking is forcing financial services to align API-first delivery with enterprise IAM and financial-grade API standards.
Why it matters: It matters because IAM teams in banking and adjacent financial services must govern trust, consent, and access flows that now extend beyond traditional application and user boundaries.
Context
Open banking changes the identity problem by making APIs part of the trust plane, not just the transport layer. In financial services, that means access decisions are no longer limited to user login and session control, but also extend to standards-based data sharing and delegated application access.
Ping Identity frames this shift as a competitive issue for North and South American banking, where customer experience, regulatory pressure, and ecosystem partnerships are converging. For IAM, the practical question is whether enterprise controls can keep pace with financial-grade APIs without weakening governance over who or what is allowed to act on behalf of a customer.
Key questions
Q: How should banks govern third-party access to open banking APIs?
A: Banks should govern third-party API access as a lifecycle-managed identity problem. That means issuing scoped consent, tracking each consumer identity, logging every authorization decision, and revoking access cleanly when a partner relationship ends. The goal is not just compliance, but provable control over who can use financial data and for what purpose.
Q: Why do legacy IAM controls struggle with financial-grade APIs?
A: Legacy IAM struggles because it was built for direct user-to-application access, while financial-grade APIs introduce delegated, multi-party trust relationships. Once access is mediated through partner platforms and consented data flows, the organisation must govern authorisation across several systems rather than a single session boundary.
Q: What breaks when API consent and IAM policy are managed separately?
A: When API consent and IAM policy are managed separately, organisations can approve one part of access while leaving another part uncontrolled. That creates mismatches between customer intent, token validity, and data exposure, which makes revocation, auditing, and incident investigation far harder.
Q: How do banks know whether their open banking controls are actually working?
A: Banks know the controls are working when every externally exposed API action can be traced back to a specific consent, policy rule, and accountable party. If the organisation cannot prove that linkage consistently, then open banking access is being granted faster than it is being governed.
Technical breakdown
Financial-grade APIs and enterprise IAM
Financial-grade APIs, or FAPIs, are standards that define how financial institutions expose data and functionality safely to third parties and partners. They depend on identity controls such as client authentication, token issuance, consent enforcement, and policy checks that are stronger than basic consumer app integration. The technical issue is that the API channel becomes part of the access decision, so IAM is no longer only authenticating a user, it is also governing machine-to-machine trust at scale.
Practical implication: IAM teams need to treat FAPI enablement as an access-control design problem, not a simple API integration task.
Why legacy IAM models struggle in open banking
Legacy IAM often assumes a direct relationship between a human user, a single application, and a bounded session. Open banking breaks that model by introducing multiple relying parties, consented data access, and ongoing trust between institutions and third-party applications. That creates a wider governance surface for token lifecycle, delegated authorization, and policy consistency across domains. The control problem is not just authentication, but whether the access context still holds after it leaves the original banking environment.
Practical implication: Organisations should review whether their current IAM architecture can represent delegated access across multiple financial actors without losing policy fidelity.
Standards-based access is now a competitive requirement
In open banking, standards are not just compliance artefacts. They are the mechanism that lets banks deliver reusable trust across customer journeys, partner ecosystems, and product experiences. When those standards are weakly integrated with enterprise IAM, the result is fragmented consent handling, inconsistent policy enforcement, and poor visibility into who can access what data through which API. The business issue and the governance issue are the same one.
Practical implication: Security and identity leaders should align API governance, consent, and IAM policy into one operating model for open banking.
Breaches seen in the wild
- Zacks breach claim 2025: A hacker leaked 12 million Zacks accounts in 2025, claiming domain admin access in 2024; HIBP verified the data, Zacks has not confirmed.
Read and download The State of NHI & AI Agent Breach Report 2026, covering 200+ breaches impacting Non-Human Identities including AI Agents.
NHI Mgmt Group analysis
Open banking moves identity control from the perimeter to the trust relationship. Once financial services expose customer data and actions through APIs, the decisive security issue is no longer only who signed in, but which parties are allowed to exchange, delegate, and reuse trust across sessions and organisations. That changes IAM from a login system into a policy engine for ecosystem participation.
Legacy IAM becomes brittle when the access path is no longer singular. Traditional models assume one application boundary and one authoritative control point, but open banking introduces multiple institutions, intermediaries, and consented interactions. The result is policy drift unless identity governance can express and enforce the same rule set across every financial-grade API touchpoint.
Financial-grade APIs create a control plane that banks now depend on for customer trust. If that control plane is weak, the organisation does not just risk technical exposure, it risks inconsistent customer experience and fragmented trust across channels. That makes open banking a governance programme as much as a digital strategy.
Open banking exposes a named governance gap: delegated API access without enterprise IAM coherence. The industry often treats API standards and IAM controls as separate initiatives, but they are operationally inseparable once third parties and partner ecosystems become part of the access model. The practical conclusion is that identity leaders must govern the full path from consent to token to data access, not any one layer in isolation.
What this signals
Financial-grade API governance now belongs inside the IAM operating model. Open banking turns customer-facing innovation into an access-governance problem, because every API call can represent delegated authority rather than direct user action. IAM teams should treat consent, token control, and revocation as one lifecycle across the ecosystem, not as separate administrative tasks.
Open banking exposes the governance gap between application security and identity policy. The more banks rely on standards-based sharing, the more they need consistent policy enforcement across portals, partner integrations, and downstream services. Without that coherence, customer experience improvements can outrun the organisation's ability to explain and control access.
Trust-based banking only scales when identity rules scale with it. That means security leaders need a shared operating view across API teams, IAM architects, and business owners so that innovation does not create invisible access paths.
For practitioners
- Map delegated API access paths Inventory which third parties, partner applications, and internal services can reach customer data through open banking interfaces. Align each path to an owner, policy rule, and revocation trigger so consent does not become a permanent trust grant.
- Review token and consent lifecycles Verify that token expiry, consent withdrawal, and client credential rotation are governed together rather than as separate controls. If one lifecycle outlives the others, the access model no longer matches the business trust relationship.
- Test policy consistency across APIs Check whether the same authorisation decision is enforced consistently across banking portals, partner APIs, and downstream services. In open banking, inconsistent policy application creates hidden exceptions that are difficult to detect later.
- Align API governance with IAM operating models Bring identity, application, and API teams into one governance process for standards-based data sharing. The objective is to ensure customer-facing innovation does not outpace the organisation's ability to prove who or what is authorised.
Key takeaways
- Open banking shifts IAM from a login-centred control model to a trust-centred operating model across financial-grade APIs.
- The main risk is policy fragmentation, where consent, token lifecycles, and authorisation are managed as separate controls.
- Practitioners should align API governance and IAM so every delegated access path remains visible, revocable, and auditable.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP API Security Top 10 addresses the attack and risk surface, while CSA Cloud Controls Matrix, NIST CSF 2.0, NIST SP 800-53 Rev 5 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CSA Cloud Controls Matrix | IAM — Identity and Access Management | Open banking depends on coordinated IAM controls across API consumers and financial ecosystems. |
| Recommendation — Align API consent and delegated access governance with IAM policy enforcement across all open banking touchpoints. | ||
| OWASP API Security Top 10 | API2 — Broken Authentication | The article centres on API-first trust relationships that depend on strong authentication and token handling. |
| Recommendation — Harden API authentication and token lifecycle controls for all financial-grade API integrations. | ||
| NIST CSF 2.0 | PR.AA-05 — Access Permissions, Entitlements and Authorizations | Open banking requires consistent authorisation across third-party and internal API pathways. |
| Recommendation — Map delegated API access to PR.AA-05 and verify entitlements remain consistent across channels. | ||
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | Token issuance, expiry, and revocation are central to controlling open banking access. |
| Recommendation — Apply IA-5 to manage API credentials, token expiry, and revocation as one lifecycle. | ||
| NIST Zero Trust (SP 800-207) | Policy enforcement point — Policy enforcement point | The article's trust model depends on enforcing access decisions at the point of API interaction. |
| Recommendation — Place policy enforcement at each open banking access point so trust decisions remain current. | ||
Key terms
- Financial-grade APIs: Financial-grade APIs are API standards designed to support regulated data sharing with stronger identity assurance and access controls. They matter because they make authorisation, token handling, and trust relationships part of the security model, not just technical integration details.
- Delegated Access: Delegated access is permission granted to one identity to act on behalf of another user, service, or system. In NHI environments, this usually appears in OAuth-connected apps and automation tooling. It is powerful, but it must be tightly scoped and reviewed because it can persist long after the original business need ends.
- Consent Lifecycle: Consent lifecycle is the full path from approval to review, change, suspension, and revocation. It matters because a consent record without ongoing enforcement leaves the delegate with authority that may no longer match the customer’s intent, business need, or regulatory obligation.
- API Trust Boundary: An API trust boundary is the point at which a system decides whether to accept, reject, or constrain a request based on identity, policy, and context. It is where authentication becomes governance, because the boundary determines what data can move and under what conditions.
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Published by the NHIMG editorial team on June 24, 2026.
Updated on October 11, 2026.
NHI Mgmt Group, the independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org