About 530A Model calculator
530A Model is a scenario-planning calculator for 530A custodial retirement accounts, with deterministic projections, rules, and guides. Its MCP server and JSON API are available to clients without login or an API key.
Key features
- 01Calculate 530A scenarios
- 02Look up rules and returns data
- 03Search and fetch guides
- 04Run calculations in the browser
- 05Offer a public JSON API
Use cases
- 01Compare account contribution scenarios
- 02Check the basis for 530A rules
- 03Fetch data for a calculator or agent
MCP support
The Streamable HTTP MCP server exposes `project_530a`, `explain_530a`, `search`, and `fetch` tools for projections, explanations, and guide retrieval. No API key is required.
Configuration
Remote servers need no local install. Pick your client, then copy the config or install in one click.
https://mcp.530amodel.comclaude mcp add --transport http com-530amodel-calculator https://mcp.530amodel.com{"mcpServers":{"com-530amodel-calculator":{"type":"http","url":"https://mcp.530amodel.com"}}}Open in Cursor{"servers":{"com-530amodel-calculator":{"type":"http","url":"https://mcp.530amodel.com"}}}Open in VS Code{"mcpServers":{"com-530amodel-calculator":{"type":"http","url":"https://mcp.530amodel.com"}}}{"mcpServers":{"com-530amodel-calculator":{"serverUrl":"https://mcp.530amodel.com"}}}Run commands in a terminal; paste JSON into the client’s MCP config and restart. Servers that need sign-in will prompt on first connect.
Tools
4| Parameter | Type | Required | Description |
|---|---|---|---|
| asOf | string | Yes | |
| mcSeed | integer | No | |
| mcPaths | integer | No | |
| sources | array | No | |
| annualFee | number | No | |
| birthDate | string | Yes | |
| includeSeed | boolean | No | |
| annualReturn | number | No | |
| returnIsReal | boolean | No | |
| annualInflation | number | No | |
| targetAgeMonths | integer | Yes | |
| annualVolatility | number | No |
Details
From the project README530A Model
530amodel.com — a free, privacy-first, mobile-first scenario-planning calculator for 530A custodial retirement accounts ("Trump Accounts").
No login. No email capture. No monetization. All calculation runs in your browser.
Use the public API / MCP server
The engine is free to call — no key, nothing stored, attribution to 530amodel.com asked:
- JSON API —
https://api.530amodel.com(POST /v1/project,GET /v1/rules,GET /v1/returns; OpenAPI 3.1 with full request/response schemas) - MCP server —
https://mcp.530amodel.com(streamable HTTP; toolsproject_530a,explain_530a,search,fetch; registry namecom.530amodel/calculator). Works as a custom connector in Claude and ChatGPT, and with the Anthropic/OpenAI agent APIs. - Docs & platform quickstarts — 530amodel.com/api · machine-readable maps: llms.txt, llms-full.txt
- Contact — [email protected]
Structure
packages/
engine/ # pure TS calculation engine — zero deps, deterministic, integer-cents money
config/ # legal figures + sources + verifiedAt + feature flags (single source of truth)
ui/ # design tokens, shared components, charts
apps/
web/ # Astro static site (widget, advanced model, content pages)
workers/ # Cloudflare Workers: analytics beacon, rollup cron, newsfeed cron, email
api/ # public calculator API (wraps the engine; OpenAPI; cache-by-input-hash)
mcp/ # read-only MCP server (project_530a / explain_530a)
reference/ # Python reference implementation + golden-vector generator
e2e/ # Playwright specs (user journeys UC-1..UC-7)
Non-negotiables
- Financial math is exact, deterministic, and independently tested (golden vectors from the Python reference implementation must match the TS engine to the cent).
- Static-first: calculation is client-side; a million users cost the same as one.
- Minimal dependencies, no PII, small attack surface, everything scanned in CI.
- Every user-facing claim is honest: ranges are labeled estimates, legal figures cite sources,
unverified items live behind OFF feature flags (
packages/config/src/flags.ts).
Development
pnpm install
pnpm check # lint + typecheck + test + build (same as CI)
pnpm --filter @530a/web dev
Node ≥ 22, pnpm ≥ 11. Engine numeric contract: money is integer cents (bigint), balances are
quantized round-half-to-even every monthly step, display formatting only via formatMoney.
Disclaimer
This tool provides educational estimates only, not financial, tax, or legal advice. Market projections are probabilistic and not guarantees.
Comments
New to MCP?
From what the protocol is to installing your first server, these answers cover most first questions.
An open protocol that defines how AI applications connect to external tools and data in a uniform way. Clients talk to the model; MCP servers provide tools, resources and prompt templates. They exchange standard messages, so one server can be reused by many clients.