MCP Server: com.530amodel/calculator

The MCP server com.530amodel/calculator provides free, deterministic 530A (Trump Account) projections. It emphasizes verified rules and offers searchable guides related to 530A (Trump Account) projections.

🛠️ Key Features

Free 530A (Trump Account) projection capability
Deterministic outputs
Verified rules for projections
Searchable guides for related information

🚀 Use Cases

Generating 530A (Trump Account) projections using deterministic logic
Following verified rules when calculating projections
Locating relevant guidance via searchable guides

⚡ Developer Benefits

Deterministic behavior for consistent projections
Rules explicitly described as “verified”
Guide content accessible through search

⚠️ Limitations

Scope is limited to 530A (Trump Account) projections and associated searchable guides.

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

code

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.

530A Model calculator