Sebastien Rousseau

PAYMENTS

Cross-border payments

FX, correspondent banking, multi-rail routing, G20 roadmap targets, and the cost-plus-speed dimensions of moving money across borders.

28 articles

APPLIED AI

The Wholesale Payments Index in 2026: ISO 20022, Tokenised Deposits, Real-Time Rails, and Cross-Border Settlement

An index framework for measuring wholesale-payments readiness in 2026: ISO 20022 structured-address compliance ahead of SWIFT's November 2026 milestone, tokenised-deposit settlement, BIS Project Agorá cross-border atomicity, real-time rail orchestration, and liquidity efficiency. Four percentages — structured-data completeness, rail-routing optimality, settlement-finality lag, and Agorá-corridor coverage — turn payment-operations posture into supervisory-ready evidence.

APPLIED AI

The Quantum-Safe Banking Index in 2026: Post-Quantum Cryptography, QKD, Crypto-Agility, and Harvest-Now-Decrypt-Later Risk

An index framework for measuring quantum-safe banking readiness in 2026: cryptographic bill of materials, hybrid TLS deployment, NIST FIPS 203 / 204 / 205 migration progress, crypto-agility primitives, and harvest-now-decrypt-later exposure across long-lived confidential data. The Board-Level Quantum Scorecard defines four exact percentages — inventory completeness, HNDL exposure, NIST migration progress, crypto-agility readiness — that turn project statuses into supervisory-ready evidence.

APPLIED AI

Wholesale Digital Markets in the UK: Tokenised Gilts, Settlement, and the New Champion Role

The UK Wholesale Digital Markets Champion role makes tokenised gilts, DLT-based settlement, and digital wholesale finance a national competitiveness project. The 2026 strategic question for banks is design discipline — which tokenised assets sit on which platform, how settlement risk is evidenced, and how to defend the City's wholesale role against Singapore, Switzerland, and Frankfurt.

APPLIED AI

ISO 20022 After Migration: Turning Payment Data into Banking Products in 2026

ISO 20022 after migration is not a project closeout — it's the start of a data-product opportunity. Structured addresses, purpose codes, invoice details, and rich status events become reconciliation, fraud, liquidity, and compliance products. The 2026 question is design discipline: which payment data carries which client workflow, priced for which corporate.

APPLIED AI

Digital Assets in 2026: The Infrastructure Transition Banks Cannot Delay

Digital assets are no longer an innovation bet. They are a settlement, custody, and balance-sheet architecture question. Crypto is a ~$3 trillion asset class, stablecoins have reached ~$300 billion, and tokenised real-world assets grew ~300% in 2025. The strategic task for banks in 2026 is not whether to engage but how to design infrastructure, controls, and governance for a world where money, assets, and settlement become programmable.

APPLIED AI

DORA, the EU AI Act, and Data Sovereignty: The 2026 Compliance Stack for Banks

DORA, the EU AI Act, GDPR, cloud concentration risk, and data sovereignty converge into one 2026 compliance stack for banks. The strategic question is design discipline — running compliance, AI governance, ICT-resilience evidence, and sovereign-data choices as one architecture, not five parallel programmes.

APPLIED AI

Stablecoins vs Tokenised Deposits in 2026: What Banks Actually Need to Defend

Stablecoins and tokenised deposits converge around programmable settlement but diverge on balance-sheet, legal, liquidity, and trust models. The 2026 strategic question for banks is design discipline — which money model carries which client workflow — and how to defend deposit franchise, settlement role, and regulated brand against private-issuer competition.

APPLIED AI

Programmable Liquidity in 2026: AI, Tokenised Deposits, and Real-Time Treasury Orchestration

Programmable liquidity in 2026 connects AI forecasting, tokenised deposits, real-time rails, virtual accounts, stablecoins, and TMS into one orchestration layer for working capital. The strategic question for banks is design discipline: which data, rails, controls, liabilities, and client workflows belong together — and how to evidence the orchestration to clients and supervisors.

APPLIED AI

Agentic Payments in Banking: Consent, Liability, and the New Payment UX in 2026

Agentic payments crossed from concept to live transaction in 2026 — Mastercard and Rabobank executed a Netherlands AI-agent payment via Agent Pay, AP2-style cryptographic mandates are emerging, and HM Treasury says payment-services regulation must adapt. The banking architecture question is consent, identity, liability, and pre-settlement evidence.

APPLIED AI

Quantum-Safe Payments: Why the Industry Must Act Now

Modern payment infrastructure relies on public-key cryptography. RSA, ECC, and Diffie-Hellman. To authenticate transactions, protect cardholder data, and secure messaging between financial…

APPLIED AI

Unlocking Gemini 1.5: Google's AI Revolution Explained

Gemini 1.5 is built on a new version of the Mixture of Experts (MoE) architecture, enhancing its ability to selectively activate the most relevant pathways in its neural network. This advancement…

APPLIED AI

Static Site Generator: Fastest Rust-Based SSG

In the ever-evolving digital landscape, speed and quality are of paramount importance. I was determined to find a way to quickly generate static websites that showcase high quality, accessibility,…

APPLIED AI

Automating ISO 20022 Payment Files Creation with pain001

pain001 is an open-source Python library that generates ISO 20022 pain.001.001.09 (CustomerCreditTransferInitiation) XML from CSV or SQLite input, validates output against the XSD schema, and computes CtrlSum and NbOfTxs automatically — supporting both SEPA SCT and CBPR+ cross-border message formats.

APPLIED AI

Unveiling a new Cryptocurrency and Faster Payment Solution

The Express Transaction Credits (EXTC) platform was an early-2018 experiment in programmable payments on Ethereum, using ERC-223 smart contracts to enable instant cross-border transfers and atomic payment flows — ideas that decentralised finance later scaled.