Fintech tools that are deterministic, private, and yours to keep
AINumbers.co is a catalog of browser-based calculators, validators, and simulators for the people who actually run payments, compliance, treasury, and risk. Every tool runs entirely on your device — same input, same output, nothing sent anywhere.
A working reference for payments practitioners
Most fintech work happens in spreadsheets, vendor portals, and half-remembered rulebooks. AINumbers.co replaces the repetitive parts with focused, single-purpose tools — an ISO 20022 message builder, a FedNow participation scorer, a Basel RWA calculator, a sanctions-screening batch checker, a DORA gap analyser, and a few hundred more.
Each one does a single job well: you give it structured inputs, it returns a defensible, reproducible result, and where it matters it exports a machine-readable mandate or report you can hand to a counterparty, auditor, or your own systems. There are no accounts, no paywalls, and no "request a demo" gates between you and the answer.
Four principles, no exceptions
connect-src 'none', so the page cannot make a network call even if it tried. You can safely work with sensitive structure (just not real personal data).AP2 policy-mandate export and an MCP-ready manifest for agentic pipelines.Two related things, two different jobs
AINumbers.co is built and maintained by Post Oak Labs, a fintech and payments consultancy. The two sites are easy to confuse, so here's the distinction in one line: AINumbers is a self-serve reference you operate yourself; the Post Oak Labs demo suite shows those same capabilities running end-to-end.
- Open any tool, enter your own inputs, get a result
- Organized by category, hub, and goal-based tool chains
- Discovery aid: find the right tool and the right order
- Free, client-side, zero PII, no sign-up
- Pre-filled inputs and commentary across a full scenario
- Organized by archetype: Agentic Runtime, RegTech, BaaS, Processors, Stablecoin Issuer
- Demonstration: shows what the tools can do together
- The consulting context behind the catalog
Use AINumbers when you want to do the work yourself. Visit the Post Oak Labs demos ↗ when you want to see a complete workflow run before you build it.
The tools compose on purpose
The catalog isn't a pile of unrelated calculators. Tools share input and output conventions so the result of one feeds cleanly into the next, and the site exposes that structure three ways. Categories group tools by domain. Integration hubs gather everything you need for a single area — open banking, DORA resilience, AML/KYC, B2B payments, and seventeen more. And tool chains organize sequences by goal rather than category: "validate an ISO 20022 cutover," "build a DORA submission," "design a BaaS programme."
That intentional composition is the point. Whether you're a practitioner finding the next step or someone evaluating the catalog as a whole, the tools are meant to be read as a coherent system — each piece useful alone, and more useful in sequence.
Built for developers, bots, and LLMs too. Because every tool is plain, deterministic HTML, it's as legible to a machine as it is to a person — many ship an MCP-ready manifest.json and an AP2 policy-mandate export so agents can call them inside automated pipelines, and the site publishes an llms.txt with clean semantic markup so crawlers and language models can index it reliably. The entire catalog is open source — fork it on GitHub ↗.
Built and maintained by Post Oak Labs
Post Oak Labs is a payments and fintech consultancy. AINumbers.co is its open, public reference library — the deterministic tools behind the consulting work, released free under CC BY 4.0 so anyone can use, fork, and build on them.
Spotted a wrong result, want a tool that doesn't exist yet, or have a payment code we're missing? Get in touch — every message gets read.