AINumbers.co: Fintech Intelligence Suite

Fintech compliance calculations get done by hand, in spreadsheets, or inside a vendor black box with no way to check the work. AINumbers.co gives payments engineers, ops teams, treasury analysts, and compliance professionals 500+ deterministic browser tools plus ChainGraph: an open standard where every calculation emits a reproducible hash, so any output can be independently re-verified instead of trusted on faith.

Built by Post Oak Labs. Live Suite · MCP Server · ChainGraph Standard

Try it

• Run a tool: open any tool page directly. Single self-contained HTML file, no install, no account.
• Run a chain: Workbench, pick a chain from the catalog, run it, verify the resulting hash.
• Connect an agent: point any MCP host at https://mcp.ainumbers.co/mcp. Docs at ainumbers.co/mcp.html.

Counts drift as tools ship. Never trust a hardcoded number here or anywhere else in this repo. Live figures: node scripts/counts.mjs (site) and mcp-apps-poc/data/counts.json (MCP server).

What this is

A privacy-first, deterministic tool suite spanning 32 fintech categories: AML/KYC, cross-border payments, DLT/tokenization, treasury, embedded finance, e-invoicing, DORA/PSD3/MiCA compliance, and more. Plus ChainGraph, an open standard for verifiable, hash-chained decision artifacts (the standard's formal name is OpenChainGraph; ChainGraph is the name its AINumbers surfaces use). Every ChainGraph node emits a reproducible execution_hash. Chains cite the hashes of the nodes they consume, so any agent can independently re-verify a multi-step decision. See chaingraph/standard/SPEC.md for the normative spec.

Two consumption surfaces:

• Browser, direct. Every tool and ChainGraph node is a single self-contained .html page, zero network calls after load.
• Agent, via MCP. The tool suite is also served to any MCP host (Claude, ChatGPT, Cursor, and others) by a separate Cloudflare Workers server. See Model Context Protocol server below.

Repository structure

ainumbers/
CONTRACT.md         Build contract, SSOT for all contributors, read before any build
index.html          Homepage (tool grid, category filters, search)
tools/               Self-contained standalone tool pages (inline CSS/JS, no build step)
guides/              Category hub pages (*-hub.html)
chaingraph/          ChainGraph: standard/ (SPEC.md, JSON schema), kernels/, node + chain pages
ledger/              Local-only receipt ledger (IndexedDB carve-out, CONTRACT §A7)
manifests/           Per-tool MCP manifests (one JSON per tool)
mcp/                 Data files consumed by the MCP server (catalog.json, server.json).
                     Not the server itself; the live MCP server is a separate repo, see below.
scripts/             Build/CI gates. preflight.mjs runs every hard gate locally before push.
.github/workflows/   Deploy pipeline (preflight-equivalent gates, rsync, smoke test)
sitemap.xml / robots.txt / llms.txt

Model Context Protocol server

The live MCP server (https://mcp.ainumbers.co/mcp, streamable HTTP, no auth) lives in a separate repo, PostOakLabs/ainumbers-mcp-apps, deployed to Cloudflare Workers. That server vendors tool HTML, manifests, and ChainGraph kernels from this repo at build time (generate.mjs, run from the worker repo) and re-registers every time chaingraph.json or a manifest changes and gets re-vendored.

Every tool ships a manifest at manifests/{tool}.manifest.json for MCP auto-discovery, and mcp/catalog.json is the machine-readable bulk index the worker repo's generate.mjs reads from. Agents discovering the suite from outside start at .well-known/mcp.json, which resolves to mcp/server.json for capabilities and mcp/catalog.json for the tool list.

Architecture

• Single-file tools and nodes. Each lives in tools/ or chaingraph/ with fully inline CSS/JS. No build step, no dependencies, no CDNs.
• Deterministic execution. Rule-based math, schema validation, static reference tables. Bit-for-bit reproducible outputs across runs.
• ChainGraph as the sole orchestration surface. Multi-tool workflows are ChainGraph chains (chaingraph/chains/), not the deprecated Composer/Scenario Guide page types. See chaingraph/standard/SPEC.md §18.4 for the strength-of-verifiable ladder (L1 §4 hash → L2 §16 proof binding → L3 §18 compute receipt) and §15 for the conformance gates.
• AINumbers Policy Mandate export. Policy, rule, mandate, and compliance tools export a structured Policy Mandate (JSON and Markdown), validated before download. This is AINumbers' own schema, not Google's AP2 payments protocol (CONTRACT §3.1).
• Ledger. ledger/ is the one carve-out from the site's zero-client-storage rule (CONTRACT §A7): local-only IndexedDB receipt store, export/import, zero transmission except a user-initiated anchor call.

Deploy flow (CI-owned)

Branch, then PR. Run node scripts/preflight.mjs locally: every hard CI gate (JS syntax, hash integrity, SSOT conformance, count-drift, dead-link, copy-hallmarks, and more) runs the same way it does in CI, so green here means green there. Merging to main triggers GitHub Actions, which runs the same gates, rsyncs to the DreamHost production host, then runs an HTTP smoke test against the live domain. No manual SFTP or rsync, ever.

A committed pre-push hook (.githooks/pre-push) runs preflight.mjs automatically. Enable it once per clone with node scripts/setup-hooks.mjs.

Adding a tool

1. Create tools/XX-{kebab-slug}.html, a single self-contained file per CONTRACT.md.
2. Add manifests/XX-{kebab-slug}.manifest.json per CONTRACT.md §2.2.
3. Add a card to index.html with the correct data-cat attribute and T-number.
4. Run node scripts/preflight.mjs and fix anything red.
5. Push. CI validates and deploys automatically.

Full workflow: CLAUDE.md in this directory, then CONTRACT.md for the full spec.

Contributing

• Open an issue or PR on GitHub.
• Follow deterministic, auditable logic standards per CONTRACT.md.
• Include citation footnotes for all regulatory and financial claims.
• Never introduce external dependencies, PII collection, or network calls after page load.
• Policy Mandate export is required on all new policy, rule, mandate, or compliance tools.

Links

• Live Suite
• MCP Server docs
• ChainGraph standard
• ChainGraph hub
• Ledger
• Post Oak Labs

Post Oak Labs. Code MIT; site content CC BY 4.0.