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8 clients · secrets stay placeholders

JSON (mcpServers)Claude CodeCodexOpenCodeCursorVS CodeGemini CLIGoose

{
  "mcpServers": {
    "freetoolhub": {
      "type": "http",
      "url": "https://freetoolhub.org/api/mcp",
      "headers": {
        "X-API-Key": "${X_API_KEY}"
      }
    }
  }
}

claude mcp add --transport http freetoolhub https://freetoolhub.org/api/mcp --header "X-API-Key: ${X_API_KEY}"

[mcp_servers.freetoolhub]
url = "https://freetoolhub.org/api/mcp"
env_http_headers = { "X-API-Key" = "X_API_KEY" }

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "freetoolhub": {
      "type": "remote",
      "url": "https://freetoolhub.org/api/mcp",
      "enabled": true,
      "headers": {
        "X-API-Key": "{env:X_API_KEY}"
      }
    }
  }
}

{
  "mcpServers": {
    "freetoolhub": {
      "type": "http",
      "url": "https://freetoolhub.org/api/mcp",
      "headers": {
        "X-API-Key": "${X_API_KEY}"
      }
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=freetoolhub&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vZnJlZXRvb2xodWIub3JnL2FwaS9tY3AiLCJoZWFkZXJzIjp7IlgtQVBJLUtleSI6IiR7WF9BUElfS0VZfSJ9fQ%3D%3D"
}

{
  "servers": {
    "freetoolhub": {
      "type": "http",
      "url": "https://freetoolhub.org/api/mcp",
      "headers": {
        "X-API-Key": "${X_API_KEY}"
      }
    }
  }
}

{
  "mcpServers": {
    "freetoolhub": {
      "httpUrl": "https://freetoolhub.org/api/mcp",
      "headers": {
        "X-API-Key": "${X_API_KEY}"
      }
    }
  }
}

extensions:
  "freetoolhub":
    enabled: true
    name: "freetoolhub"
    type: streamable_http
    uri: "https://freetoolhub.org/api/mcp"
    headers:
      "X-API-Key": "${X_API_KEY}"
    timeout: 300

Placeholders to fill from your own secret store: ${X_API_KEY}. The registry never accepts secret values.

Quality 73 / 100needs work

protocol75 · weight 25

warn
protocol.modernnewest supported version is 2024-11-05; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
n/a
protocol.statelessonly applies to 2026-07-28 servers
pass
protocol.transportstreamable HTTP
n/a
protocol.list_ttlonly applies to 2026-07-28 servers

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygiene71 · weight 30

pass
tools.descriptionsevery tool has a description
pass
tools.description_lengthdescriptions are concise
pass
tools.schemasevery tool has an object input schema
fail
tools.annotationsno tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
fail
tools.directory_hintsno tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: calculate_life_insurance (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); calculate_home_equity (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); validate_mcp_server_card (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); …
pass
tools.token_costabout 7,987 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump

stability75 · weight 15

warn
stability.changes6 tool changes in 30 days
pass
stability.rug_pullno tool changed its meaning under the same name

dependenciesn/a · weight 15

n/a
deps.known_vulns, deps.mcp_sdk_version, deps.resolvableno npm or PyPI package

50 tools, about 7,987 tokens to load them all · tool set 8f4d52473530 · tools last changed 2026-09-25 · checked 2026-10-19 10:20 UTC

Tool changes

2026-09-25calculate_pay_raiseadded
What a raise is actually worth after tax. Runs the real brackets before and after, so bracket crossings are handled — not a flat marginal rate applied to the raise.
2026-09-25calculate_marginadded
Gross margin AND markup for the same deal, plus reverse pricing from a target margin or markup and the real margin cost of a discount.
2026-09-25calculate_retirementadded
Retirement projection in today's dollars: projected nest egg, sustainable income at your withdrawal rate, gap, and the monthly contribution that closes it.
2026-09-25calculate_loanadded
Any fixed-rate loan: monthly payment, total interest, payoff time, and interest saved by extra monthly payments.
2026-09-25calculate_tax_refundadded
Estimate US tax refund or balance due before filing: tax owed minus withholding minus credits, federal and state. NOT the IRS refund tracker.
2026-09-25calculate_income_taxadded
US income tax for 2026: federal tax bracket by bracket, state tax, marginal vs effective rate. Uses latest IRS brackets from CDN data.

Full history: list_changes · trend: quality JSON.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 93 / 100

provenance90

liveness98

freshness85

hygiene100

+repository +namespace-matches-repo +website +reachable +uptime-95% ~updated-34d-ago

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Endpoints

remote	auth	reachable	uptime 30d	p50	protocol	last ok
`https://freetoolhub.org/api/mcp` streamable-http	none	yes	95%	201 ms	2024-11-05	2026-10-19

Tools (50)

`advise_tool_portfolio`	Too many MCP tools makes agents pick the wrong one. Given your tool list and usage, get keep / merge / remove recommendations to get under the 10–15 tool guideline.
`audit_mcp_server_security`	Audit an MCP server against the OWASP MCP Top 10. Reports authentication, path traversal, command injection, secret exposure and supply-chain risk with a concrete remediation list.
`calculate_1099k_tax`	Estimate tax on 1099-K income (reselling, gig work). SE tax, QBI, quarterly 1040-ES. Uses latest CDN data.
`calculate_break_even`	Break-even point: units to sell to cover fixed costs. Contribution margin, target profit analysis.
`calculate_capital_gains_tax`	US capital gains tax on stock/crypto. Short vs long-term, NIIT 3.8%, state tax. Uses latest CDN LTCG brackets.
`calculate_car_loan`	Monthly car payment, total interest, amortization. Includes sales tax, trade-in, down payment. Uses latest CDN sales tax rates.
`calculate_compound_interest`	Compound interest with monthly contributions. Returns final balance, total interest, inflation-adjusted value. Uses latest CDN inflation rate.
`calculate_dropship_profit`	True dropshipping profit after product cost, platform fees, payment processing, ad spend. Uses latest CDN payment processor fees.
`calculate_estate_tax`	Calculate federal estate tax. 2026 exemption $13.61M, 40% rate. Includes marital deduction.
`calculate_freelancer_pricing`	Turn hourly rate into project quote with overhead, profit margin, milestone splits.
`calculate_freelancer_tax`	Complete freelancer tax: SE tax, QBI deduction, federal + state income tax. Returns quarterly payment. Uses latest CDN data.
`calculate_github_actions_cost`	Estimate a GitHub Actions monthly bill using the January 2026 runner rates (Linux $0.006/min, Windows $0.010, macOS $0.062), accounting for plan allowances. Also reports what the same workload cost before the price cut.
`calculate_home_equity`	Calculate home equity, max borrowable amount (HELOC), and monthly payments. LTV limits included.
`calculate_hsa_fsa_savings`	Calculate tax savings from HSA and FSA contributions. Federal + FICA + state tax savings. Latest CDN limits.
`calculate_income_tax`	US income tax for 2026: federal tax bracket by bracket, state tax, marginal vs effective rate. Uses latest IRS brackets from CDN data.
`calculate_life_insurance`	Calculate life insurance needs using DIME method: Debt, Income, Mortgage, Education.
`calculate_loan`	Any fixed-rate loan: monthly payment, total interest, payoff time, and interest saved by extra monthly payments.
`calculate_margin`	Gross margin AND markup for the same deal, plus reverse pricing from a target margin or markup and the real margin cost of a discount.
`calculate_mortgage`	Monthly mortgage payment (P&I) + property tax, insurance, PMI. Full PITI breakdown. Uses latest CDN mortgage rates for defaults.
`calculate_pay_raise`	What a raise is actually worth after tax. Runs the real brackets before and after, so bracket crossings are handled — not a flat marginal rate applied to the raise.
`calculate_payroll_tax`	Calculate paycheck deductions: federal tax, Social Security, Medicare, state tax. All 50 states. Latest CDN data.
`calculate_quarterly_tax`	Calculate quarterly estimated tax payments (Form 1040-ES). SE tax + income tax divided by 4. Latest CDN data.
`calculate_rental_affordability`	How much rent can you afford? 30% rule, DTI ratio, comfortable rent range.
`calculate_rental_roi`	Rental property ROI: cap rate, cash-on-cash return, NOI, annual cash flow. Includes vacancy and management.
`calculate_reseller_profit`	Compare real profit across reselling platforms (eBay, Poshmark, Mercari, etc.) after fees. Uses latest CDN platform fee data.
`calculate_retirement`	Retirement projection in today's dollars: projected nest egg, sustainable income at your withdrawal rate, gap, and the monthly contribution that closes it.
`calculate_roi`	ROI, ROAS, net profit, CPA, CPC for marketing campaigns. Facebook, Google, TikTok ad analysis.
`calculate_se_tax`	Calculate US self-employment tax (15.3%), QBI deduction, quarterly payments. Uses latest IRS brackets from CDN data.
`calculate_student_loan`	Student loan payoff: monthly payment, total interest, months saved with extra payments.
`calculate_tariff`	Estimate import duties and landed cost by HS code category. Covers US MFN + Section 301 tariffs.
`calculate_tax_refund`	Estimate US tax refund or balance due before filing: tax owed minus withholding minus credits, federal and state. NOT the IRS refund tracker.
`check_economic_nexus`	Check which US states you have economic nexus in for sales tax collection. Based on Wayfair ruling. Latest CDN thresholds.
`compare_401k_vs_roth`	Compare 401(k) pre-tax vs Roth IRA post-tax. 30-year growth, tax drag, recommendation. Uses latest CDN contribution limits.
`compare_ai_coding_tool_costs`	Compare monthly and annual cost of AI coding subscriptions (GitHub Copilot, Cursor, Claude Code/Pro/Max, OpenAI Codex) for a given team size and usage intensity, then compare the winner against pay-as-you-go API pricing for the same workload. Prices verified 2026-09.
`compare_automation_platform_costs`	Compare real monthly cost on Zapier (per task) versus Make (per operation) for the same workflow volume, including the counting-model difference that makes the two quotes non-obvious.
`compare_llc_cost`	Compare LLC formation and maintenance costs across US states. 5-year total cost. Uses latest CDN LLC state fees data.
`compare_llm_api_costs`	Rank 18 LLM models by the real monthly cost of a given workload (input/output tokens per call × calls per month). Reports the cheapest and most expensive option, the cost spread, and which models can actually hold your prompt in their context window.
`compare_w2_vs_1099`	Compare take-home pay: W-2 salary vs 1099 contractor rate. SE tax, FICA, standard deduction, state tax. Latest CDN data.
`compress_tool_definitions`	Shrink MCP tool descriptions and JSON schemas to cut context cost without changing how agents call them. Returns the compressed definitions plus exact token savings.
`detect_polling_cost_traps`	Find the most common hidden cost in no-code automation: using polling where a webhook would do. Quantifies the wasted task/operation quota and the monthly dollars.
`estimate_mcp_context_budget`	Estimate how much of an LLM context window your MCP servers consume, and which tool definitions to cut first. Paste your MCP config. Returns per-server token cost, remaining budget, and ranked reduction advice.
`estimate_selfhosted_tco`	Compare paying hosted CI overage against running self-hosted runners, including the maintenance hours people forget to cost. Reports the true break-even volume.
`find_tool`	Semantic tool router. Given a natural-language intent, return only the most relevant tools from this server so the client can inject 3 schemas instead of 27. This is the "find_tool" meta-tool the MCP optimisation literature calls for.
`generate_mcp_client_config`	Generate ready-to-paste MCP server config for Claude Desktop, Cursor, VS Code and Windsurf from one input. Config completeness decides whether developers can install your server at all.
`generate_mcp_server_card`	Generate a SEP-1649 MCP Server Card (/.well-known/mcp/server-card.json) so crawlers and registries can discover your server without connecting to it.
`get_sales_tax_rate`	Get state sales tax rate for any US state. Returns base state rate + estimated local rate. Latest CDN data.
`plan_context_window_budget`	Given a set of MCP servers and their tool counts, show for every model context window (128K, 200K, 1M, 10M) how much of the window the tool definitions consume, how much is left for conversation, and whether the server set fits at all. Answers "how many servers can I attach on model X?".
`plan_mcp_token_budget`	Plan and attribute MCP token spend across agents, servers and workflows — something the protocol provides no native support for. Outputs per-dimension cost split and a quota plan.
`score_mcp_server_trust`	Score an MCP server A–F on trustworthiness and maintenance health, so you can choose between four servers that all claim to do the same thing. Supply what you know about the server.
`validate_mcp_server_card`	Validate an MCP Server Card against SEP-1649 and report every missing or malformed field before you publish it. Checks structure (serverInfo, transport, capabilities, authentication) and format (semver version, http(s) transport URL, capabilities.tools entries), returning a full error and warning list.

Schemas: list_tools.

Similar MCP servers

Official server.json

{
  "name": "io.github.cavan1977/freetoolhub",
  "_meta": {
    "io.modelcontextprotocol.registry/publisher-provided": {
      "tool": "manual",
      "freeTier": "50 calls/day per IP",
      "toolCount": 44,
      "categories": [
        "finance",
        "tax",
        "business",
        "developer-tools",
        "productivity",
        "ai"
      ],
      "transportNote": "Stateless, POST-only JSON-RPC. Implements initialize / tools/list / tools/call. GET returns 405 (no server-initiated SSE stream) and no Mcp-Session-Id is issued — both explicitly permitted for stateless servers by the Streamable HTTP spec. Verified end-to-end with the official @modelcontextprotocol/sdk StreamableHTTPClientTransport.",
      "protocolVersion": "2024-11-05"
    }
  },
  "title": "FreeToolHub",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://freetoolhub.org/api/mcp",
      "type": "streamable-http",
      "headers": [
        {
          "name": "X-API-Key",
          "isSecret": true,
          "description": "Optional. Free for 50 tool calls per IP per day without a key. Supply a key to lift the daily quota."
        }
      ]
    }
  ],
  "version": "2.0.0",
  "repository": {
    "url": "https://github.com/cavan1977/freetoolhub",
    "source": "github"
  },
  "websiteUrl": "https://freetoolhub.org/mcp/",
  "description": "44 calculators for AI agents: US tax, finance, business + an MCP engineering & security suite."
}