Source and availability

Tedix identifies Mamble Calculators from Upstream Mcp tool source; Store sources: ChatGPT app store; Distribution: Ecosystem Directory. Availability is reported for US, FR, GB, ES, KR, IN.

• ChatGPT app store Auth not flagged · RELEASED · US, FR, GB, ES, KR, IN

Auth, tools, and actions

Authentication: Open Access. No special capability flags are currently listed. Current MCP inventory reports 21 tools, 21 resources, and 0 prompts.

• analyze_break_even · Read-only action

  Educational refinance break-even: months to recover user-entered closing costs (and optional prepayment penalty) through modeled monthly P&I savings (monthlySavingsBasis: pi_only). Returns adjusted break-even, payment comparison, and modeled interest/cost differences. Not loan approval, live rates, or tax advice.

• analyze_buydown · Read-only action

  Educational temporary buydown analysis for 2-1, 1-0, or custom structures. Returns qualifying payment (note-rate P&I), year-by-year temporary payment reductions, monthly savings, payment shock at reset, and estimated buydown fund. Optional quoted buydown cost comparison. P&I only; user supplies all inputs — not a lender disclosure.

• analyze_cash_flow · Read-only action

  Educational rental property cash flow analysis from user-entered rent, vacancy, operating expenses, and financing. Returns modeled NOI, debt service (P&I), monthly and annual cash flow, cash-on-cash return, DSCR, expense ratio, and break-even occupancy. Not live market data, tax advice, or investment advice.

• analyze_cash_out_refinance · Read-only action

  Educational modeled cash-out refinance: equity withdrawn, estimated proceeds, new loan amount, LTV, equity remaining, and P&I payment change (monthlySavingsBasis: pi_only). Optional educational PMI estimate when LTV ≥ 80%. Not loan approval, live rates, tax advice, or debt-consolidation guidance.

• analyze_extra_payments · Read-only action

  Analyses how monthly and one-time extra principal payments affect a fixed-rate mortgage. Returns interest saved, months and years saved, illustrative payoff dates, and effective interest reduction versus the baseline schedule. Use when a user asks about paying off a mortgage early, extra payments, prepayment impact, or mortgage prepayment vs investing (educational only).

• analyze_refinance · Read-only action

  Analyses a mortgage refinance scenario by comparing the current loan against a proposed refinance. Returns monthly savings, break-even period (months/years to recover closing costs), total lifetime cost comparison, and a simple should-refinance heuristic. Supports rate-and-term and cash-out refinances. Use when a user asks "should I refinance?", wants to compare their current rate to a new offer, or wants to know the break-even point on closing costs.

• analyze_roi · Read-only action

  Educational modeled total return for a rental property over a user-chosen horizon. Combines cumulative modeled cash flow and projected equity at sale (from appreciation assumptions you enter). Returns modeled total return %, cash-on-cash (year-one), annual cash flow, equity at horizon, and projection rows. Not IRR/XIRR, not tax-adjusted, not investment advice or live market data.

• calculate_apr · Read-only action

  Calculates an educational actuarial APR for a fixed-rate mortgage from the note rate, loan amount, and upfront finance charges (discount points, origination fee, and additional finance charges). Returns APR, note rate, amount financed, fee breakdown, and whether APR exceeds the note rate. User supplies all fees — no live lender pricing. Use when comparing loan estimates or explaining APR vs interest rate. Not an official lender disclosure.

Plus 13 additional actions in the full tool inventory.

Verification freshness

• Catalog synced 11h ago (June 6, 2026)
• Connector checked 1d ago (June 5, 2026)
• MCP scanned 1d ago (June 5, 2026)
• Directory updated 11h ago (June 6, 2026)