Servers by com.gumballtools
All 14 servers published to the MCP Registry under the com.gumballtools namespace.
Amortization Schedule
RemoteRow-by-row loan amortization schedules: monthly or daily accrual, extra principal, PMI, biweekly.
Payload Validator
RemoteValidate JSON, YAML, XML and CSV with exact line/column errors and silent-corruption warnings.
Equation Steps
RemoteStep-by-step solver for linear/quadratic equations in one variable, signs and ± always right.
JSON to Types
RemoteConvert JSON samples into TypeScript interfaces and Zod schemas, with inference caveats.
Penny Rounding
RemoteRound cash totals to the nearest nickel correctly — after tax, on the total, cash only.
Body Metrics
RemoteConvert height and weight, compute BMI, TDEE and protein targets with error bounds.
Due Date
RemoteEstimate a due date from LMP, conception, or ultrasound, with ACOG redating rules.
Timezone Truth
RemoteConvert times between IANA zones and detect skipped or ambiguous DST local times.
Color Companion
RemoteConvert colours between hex, RGB, HSL, OKLCH and CMYK, and compute harmonies.
Words in Context
RemoteWords-in-context vocabulary practice questions with distractor explanations.
Regex Explainer
RemoteExplain a regex in plain English and detect catastrophic backtracking risk.
Sports Rules
RemoteWork an offside call through IFAB Law 11 or NHL Rule 83, step by step.
Check Digit Validator
RemoteValidates IBAN/ISBN/EAN/Luhn checksums and finds the one wrong digit
ISO Week Number
RemoteISO 8601 week numbers: date to week, week to date, weeks-per-year.