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530A Model calculator

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Free, deterministic 530A (Trump Account) projections, verified rules, and searchable guides.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http 530a-model-calculator 'https://mcp.530amodel.com'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "530a-model-calculator": {
            "type": "http",
            "url": "https://mcp.530amodel.com"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. 530A Model
  2. Use the public API / MCP server
  3. Structure
  4. Non-negotiables
  5. Development
  6. Disclaimer

530A 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; tools project_530a, explain_530a, search, fetch; registry name com.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 — api@530amodel.com

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

  1. Financial math is exact, deterministic, and independently tested (golden vectors from the Python reference implementation must match the TS engine to the cent).
  2. Static-first: calculation is client-side; a million users cost the same as one.
  3. Minimal dependencies, no PII, small attack surface, everything scanned in CI.
  4. 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.

Frequently asked questions

What is 530A Model calculator?

Free, deterministic 530A (Trump Account) projections, verified rules, and searchable guides.

How do I install 530A Model calculator?

It runs as a remote server. In Claude Code: claude mcp add --transport http 530a-model-calculator 'https://mcp.530amodel.com'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does 530A Model calculator need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is 530A Model calculator open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains 530A Model calculator?

It is published by zach-eikenberry. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.