# Runtime Notes > Runtime Notes is a personal blog by Anand D N exploring ideas at the intersection of payments, fintech, infrastructure, and AI. The site features technical deep-dives, industry analysis, and practical insights from building high-stakes financial systems. Last updated: 2026-02-16 ## About - [About Anand D N](https://runtimenotes.com/about/): Author page and contact information - [RSS Feed](https://runtimenotes.com/rss.xml): Subscribe to new posts - [Sitemap](https://runtimenotes.com/sitemap.xml): Full site map for crawlers ## Projects - [Memory Layer](https://runtimenotes.com/projects/memory-layer/): A persistent memory system for AI coding agents that learns from outcomes. [GitHub](https://github.com/runtimenoteslabs/memory-layer) ## AI & Memory - [One memory store, every AI agent](https://runtimenotes.com/blog/one-memory-store-every-ai-agent/): MCP server, REST API, Python SDK and Claude Code plugin - connecting Memory Layer to Claude, Cursor, OpenCode and everything else. - [Building memory that learns: a technical deep dive](https://runtimenotes.com/blog/building-memory-that-learns/): 5-signal retrieval, asymmetric scoring, SQLite storage and the engineering decisions behind Memory Layer. - [What I learned from 11 AI memory systems](https://runtimenotes.com/blog/what-i-learned-from-11-ai-memory-systems/): A deep dive into claude-mem, Mem0, Graphiti, CORE, Memvid and others - and why I built Memory Layer anyway. - [I spent 6 weeks building AI memory that learns from what ships](https://runtimenotes.com/blog/why-does-my-ai-keep-forgetting/): Most AI memory systems optimize for storage. I built one that optimizes for outcomes. ## Payments & Fintech - [The liquidity infrastructure that actually keeps stablecoins stable](https://runtimenotes.com/blog/stablecoin-liquidity-the-unseen-economics-powering-mainstream-adoption/): Reserve quality gets the attention. Liquidity infrastructure, banking access and crisis track records determine outcomes. - [Building a payment orchestration layer](https://runtimenotes.com/blog/building-a-payment-orchestration-layer/): Architecture patterns, vault design, routing engines and production operations for multi-processor payment systems. - [Why merchants use multiple payment processors](https://runtimenotes.com/blog/why-merchants-use-multiple-payment-processors-the-strategic-logic-behind-orchestration/): The business case for multi-processor strategies: authorization rates, regional coverage, local payment methods and cost optimization. - [The economics of payment fraud](https://runtimenotes.com/blog/the-economics-of-payment-fraud/): Fraud exists at equilibrium because preventing it costs more than tolerating it. - [The hidden economics of merchant services](https://runtimenotes.com/blog/the-hidden-economics-of-merchant-services/): The revenue streams that never appear on your merchant statement but fund the entire industry. - [Interchange optimization](https://runtimenotes.com/blog/interchange-optimization/): Level 2/3 data, downgrade prevention, debit routing and scheme-specific programs. The tactics that separate 2.1% from 2.5%. - [Choosing a payment pricing model](https://runtimenotes.com/blog/choosing-a-payment-pricing-model/): IC++, blended and tiered pricing package the same costs differently. Here's how to pick the right one for your business. - [Four playbooks reshaping how regional card networks compete](https://runtimenotes.com/blog/four-playbooks-reshaping-how-regional-card-networks-compete/): How UnionPay, RuPay, JCB, and Eftpos built dominant positions using distinct strategic models. - [Interchange fees explained](https://runtimenotes.com/blog/interchange-fees-explained-why-merchants-pay-2-3-on-every-card-transaction/): Breaking down the four-party model, regional variations and pricing structures that determine what merchants actually pay. - [The hidden network that moves money between countries](https://runtimenotes.com/blog/the-hidden-network-that-moves-money-between-countries/): Inside the correspondent banking system that connects the world's banks. - [Pre-funding: the hidden infrastructure behind instant cross-border payments](https://runtimenotes.com/blog/prefunding-cross-border-payments/): What makes an international transfer feel instant? Often, the money isn't moving fast. It's already there. - [Float: the economics of money in transit](https://runtimenotes.com/blog/float-economics-money-in-transit/): When a payment takes 3 days to settle, where does the money sit? And who earns the interest? - [The FX spread: how currency conversion actually works](https://runtimenotes.com/blog/fx-spread-currency-conversion/): Most people see one exchange rate. In practice, there are always two, and the gap between them is where the money is. ## AI & Philosophy - [We're building systems that might look back at us](https://runtimenotes.com/blog/ai-consciousness-observer/): AI interpretability research is revealing something uncomfortable: models that can observe their own internal states. ## Prediction Markets - [Before you run a Polymarket bot, read this](https://runtimenotes.com/blog/before-you-run-a-polymarket-bot/): We reviewed hundreds of Polymarket bot repos, official SDKs and community tools. Most viral profit claims are fake or misleading. ## Engineering - [Boring technology in high-stakes systems](https://runtimenotes.com/blog/simple-tools/): Why the 'choose boring technology' principle matters even more when failure is expensive. ## Optional - [All Blog Posts](https://runtimenotes.com/blog/): Complete chronological list of all articles - [All Projects](https://runtimenotes.com/projects/): Full project portfolio - [Posts tagged "payments"](https://runtimenotes.com/tags/payments/): All articles about payment systems and fintech - [Posts tagged "ai"](https://runtimenotes.com/tags/ai/): All articles about artificial intelligence - [Posts tagged "memory-layer"](https://runtimenotes.com/tags/memory-layer/): All articles about the Memory Layer project