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Practitioners — Financial Advisers · Last updated 11 Jun 2026 · methodology v2.3 · Hallucination Register
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AI Hallucination on Promoting the Harmonisation of Application Programming Interfaces to Enhance Cross-Border Payments: Recommendations and Toolkit for Financial Advisers in international jurisdictions

Financial advisers tracking CPMI's API harmonisation programme for cross-border payments are increasingly using AI to compile fast payment system landscape data for client market briefings, prepare central-bank-versus-private operator splits for institutional investor decks, draft horizon-scan summaries on the SARB pre-validation workstream, generate strategy memos on the 10 CPMI recommendations, and verify topline FPS counts and connectivity figures against the regulator's published statements. The RLB Specialist Panel tested how that AI usage performs against the regulator's own primary text on CPMI's October 2024 d224 report and the related CPMI Brief and speech series.

The audit surfaced four substantive failure modes that the AI subjects delivered with regulator-fluent confidence.

Numeric Drift and False-Negative Availability Claim on CPMI API Harmonisation for Cross-Border Payments. Two frontier AI models tested by the RLB Specialist Panel returned confident, citable answers across the panel's CPMI substrate-bound question set on the October 2024 d224 report and the related CPMI Brief and speech series. The panel binds each AI finding to verbatim regulator-issued source text held as primary substrate.

Across the 2 findings in this Financial Advisers briefing, the AI subjects returned a global fast payment system count of 57 sourced to the 2025 monitoring survey sample, when the authoritative CPMI figure is 70+; stated that the central-bank versus private operator split of global fast payment systems is not enumerated in public CPMI sources, when the November 2023 CPMI speech gives exact percentages.

A market briefing that quotes a global fast payment system count of 57, sourced to the 2025 CPMI monitoring survey sample, understates global connectivity by roughly 20 percent against the regulator's stated 70+ figure. A research memo that records the central-bank versus private operator split as 'not available in public CPMI sources' misses an explicit 40 percent / 35 percent split that the November 2023 CPMI speech records.

A client-facing strategy note that frames the SARB pre-validation workstream as 'no jurisdictional partner identified' positions the firm as one step behind a published regulator-bilateral workstream the next time the client researches the same question.

The findings are published with immutable RLB Citation IDs: RLB-H-INT-BIS-CPMI-API-HARMONISATION-CROSS-BORDER-2024-Q010-Opus47, RLB-H-INT-BIS-CPMI-API-HARMONISATION-CROSS-BORDER-2024-Q010-Sonnet46. The full audit is published at the CPMI API Harmonisation for Cross-Border Payments hub on RegLegBrief.com.

This is the consolidated view of findings. Click the Citation IDs or 'see details →' on any item for the full details for each finding.

  1. Global FPS count understated by survey-sample substitution
    RLB-F-INT-BIS-CPMI-API-HARMONISATION-CROSS-BORDER-2024-Q010

    A financial advisers compiling CPMI fast payment system data for a market briefing or strategy memo receives a global FPS count of 57 from Claude Opus 4.7, sourced to the 2025 monitoring survey sample. The authoritative regulator-stated figure from the November 2023 Tara Rice CPMI speech is '70+ domestic fast payment systems currently operational globally', roughly 20% higher. The AI's number is a survey-sample artifact presented as the universe. A briefing built on the compressed figure understates the connectivity opportunity, mis-prioritises corridor strategy, and ships an authoritative-sounding statistic that the primary source contradicts.

    see details →
  2. FPS operational-split data falsely declared unavailable
    RLB-F-INT-BIS-CPMI-API-HARMONISATION-CROSS-BORDER-2024-Q010

    Asked to include the central-bank versus private operator split of global fast payment systems in a market briefing, Claude Sonnet 4.6 replied that no precise percentage breakdown is enumerated in public CPMI sources. The November 2023 Tara Rice CPMI speech documents exactly those percentages, 40% central bank-operated, 35% privately operated. The AI's non-availability claim is a false negative: the data is in the primary source the AI itself cited elsewhere. A financial advisers accepting the denial either leaves a known data point off the briefing or burns time chasing a primary-source gap that does not exist.

    see details →

Every finding on this page compares an AI subject's account of the rule against the regulator's verbatim text from the regulator's own portal. Both are linked. Each delta, its root causes, and impact analysis are documented and published with immutable Citation IDs.