SUPA Blog
Field notes on running a principal cross-border business — payments, foreign exchange, signed documents and operating discipline.
Plainly written. No fluff. Articles on payments, foreign exchange, registration discipline, signed documents and the operating decisions a principal operator actually has to make.
The Mandate Verification API: Checking an Agent Before You Pay
How any bank can verify an agent's authority in real time, and what a clean verification response should contain.
Read →Designing Webhooks for Money Movement
Delivery guarantees, retries, ordering and signature verification for financial events that must not be missed.
Read →Why TigerBeetle: A Ledger Engine Built for Financial Volume
Behind the choice of a purpose-built double-entry database for high-throughput, high-integrity settlement.
Read →Idempotency, Reversals and Reconciliation in a Double-Entry Ledger
Practical ledger discipline for payment builders: keys, retries, compensating entries and clean reconciliation.
Read →Building a Payment Agent With Guardrails
A hands-on pattern for policy-bound agents that can transact but cannot exceed their mandate or approved counterparties.
Read →MCP for Money: Connecting Agents to Financial Infrastructure
How the Model Context Protocol becomes an entry point for agent business units, alongside API and OpenAPI.
Read →ISO 20022 for Builders: What Changes When You Speak the Standard
A developer's orientation to the messaging standard used across institutional payments, and what it means for integration design.
Read →Integrating a Payment Perimeter: An API-First Primer
How to embed accounts, FX, payouts and a double-entry ledger through a single API instead of stitching together separate vendors.
Read →What Institution Would a Hub Refuse — and Why
Admission standards and the consequences ladder: warning, reduced limits, suspension and exclusion.
Read →From Bilateral to Multilateral: The Economics of Shared KYC
Why verifying a client once and relying on it many times lowers the cost of the whole network rather than just one institution.
Read →Interchange and Card Rails for Institutional Clients
Where card networks fit as adapters, including for agent-initiated transactions, inside an agent-ready protocol.
Read →Stress-Testing a Settlement Hub: PFMI in Practice
Liquidity, operational resilience and recovery planning for a layer that could become systemically relevant.
Read →