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engineering

Five Clocks in Every Transaction

A single payment carries five timestamps that each answer a different question, and confusing any two is how you fail an audit.

analysis

X Money Launched at 6% Yield

X Money offers 6% when the federal funds rate is 3.75% to 4%, and nobody has explained where the extra 200 basis points come from.

opinion

GPU Securitization Will End Badly

CoreWeave pays five times more in interest than it earns, and pension funds hold the paper.

fintech

How Payments Actually Work

A card tap takes two seconds to approve and three days to settle, and the gap is where payments actually happen.

anatomy

How Affirm Underwrites a Loan Before the Page Loads

A sub-second credit decision running on fourteen years of repayment data the bureaus never collected.

ai & ml

RAG for Compliance Docs: What Actually Works

Most RAG pipelines are tuned for clean prose, but compliance documents have cross-references, nested definitions, and tables that break every default.

analysis

African Fintech: The Leapfrog

Africa's fintech leapfrogs are real where they follow market structure and overhyped where they import assumptions from somewhere else.

analysis

The OCC's AI Risk Tiers and What They Mean for Engineers

The OCC gave examiners a four-tier rubric for scoring AI in banks, and your architecture determines which tier you land in.

analysis

Visa Tested 22 AI Shopping Agents. The Payment Stack Wasn't Part of the Test.

Visa's benchmark scored whether agents buy the right thing, but 23% of runs bought the wrong thing, and the payment stack has no way to tell.

engineering

Reconciliation Is Where the Money Hides

Every fintech has a ledger and a bank account, and the numbers between them disagree more often than anyone admits.

engineering

Threat-Model a Fintech System, Not a Web App

OWASP catches injection and broken auth, but it won't catch the retry that donates twice from someone's bank account.