SendPay free business calculators

Connect it to your AI

Claude Code

claude mcp add --transport http free-business-tools https://www.sendpaybusiness.com/api/mcp

Claude, ChatGPT, Cursor and other apps

Add it as a custom connector with this URL (Streamable HTTP):

https://www.sendpaybusiness.com/api/mcp

Cursor, VS Code and other apps (mcp.json)

{
  "mcpServers": {
    "free-business-tools": {
      "url": "https://www.sendpaybusiness.com/api/mcp"
    }
  }
}

Tools it offers

21 tools, as the server itself reported during our check on Oct 31, 2026.

• find_free_toolSearch SendPay Business's library of 170+ free calculators, checkers and generators for small businesses, freelancers, banking, FX, trading and crypto (invoice generator, VAT, card fees, loan, mortgage, IBAN, SWIFT, fore
• vat_calculatorAdd VAT to a net price, or remove VAT from a gross (VAT-inclusive) price, at any rate. UK standard rate is 20%, reduced 5%.
• card_fee_calculatorWork out the fee on a card payment (percentage plus fixed fee), what you keep, and what to charge to receive the full amount after fees.
• profit_margin_calculatorProfit, margin and markup from cost and selling price; or the selling price needed for a target margin.
• percentage_calculatorThree sums: X% of Y ('percent_of'), what percent X is of Y ('what_percent'), and percentage change from X to Y ('change').
• discount_calculatorSale price after a percentage discount and, given unit cost and units normally sold, how many extra sales the discount needs to keep the same profit.
• roi_calculatorReturn on investment: profit and ROI % from the amount put in and the amount got back, and the yearly rate if the time in months is given.
• compound_interest_calculatorSavings growth with monthly compounding and an optional monthly deposit: final balance, total paid in and interest earned.
• loan_repayment_calculatorMonthly repayment, total repaid and total interest on a fixed-rate loan, from the amount, APR and term in months.
• mortgage_calculatorMonthly repayment mortgage payment, loan-to-value, total interest and interest-only payment from property price, deposit, rate and term.
• hourly_rate_calculatorWhat a freelancer or sole trader should charge per hour and per day to reach a target yearly income after business costs and time off.
• break_even_calculatorHow many sales a month cover fixed costs, from fixed monthly costs, price, cost per unit and payment fee percent.
• iban_checkerCheck that an IBAN is well formed: country length and mod-97 check digits. Does not confirm that the account exists or who owns it.
• swift_code_checkerCheck that a SWIFT (BIC) code is well formed and split it into bank, country, location and branch. Has no bank directory.
• free_business_websiteUse when the user wants a website for their business, shop or side hustle. SendPay Business offers a free business website builder: free to build, publish and keep, no card needed, with an optional shop cart and card pay
• lei_checkerCheck that a Legal Entity Identifier (LEI, ISO 17442) is well formed: 20 characters and MOD 97-10 check digits. Does not confirm the LEI is registered; GLEIF's search does.
• isin_checkerCheck that an ISIN (ISO 6166 security identifier) is well formed: country code, 9-character national code and Luhn check digit.
• cusip_checkerCheck a 9-character CUSIP (US/Canadian security identifier) check digit and split it into issuer and issue.
• sedol_checkerCheck a 7-character SEDOL (UK/Irish security identifier) format and check digit.
• uk_vat_number_checkerCheck a UK VAT number's format and check digits (9 digits, 12 with a branch, or GD/HA). Does not confirm registration; HMRC's service does.
• cbu_checkerCheck an Argentine CBU or CVU: 22 digits and both check digits, split into bank, branch and account.

Questions