{ "openapi": "3.1.1", "info": { "title": "Ledgerly Is It Peanuts? Relative Scale API", "version": "1.0.0", "summary": "A billionaire’s gift as a share of their fortune, scaled to your own money and working hours.", "description": "Every endpoint performs the same calculation as the human page and returns inputs, result, units, assumptions, sources, warnings and computedAt. MCP endpoint: /mcp." }, "servers": [ { "url": "https://ledgerlyrelativescale.usefulweb.app" } ], "paths": { "/api/v1/calculate": { "post": { "operationId": "calculate", "summary": "A billionaire’s gift as a share of their fortune, scaled to your own money and working hours.", "description": "Compares a big amount — a donation, a fine, a bonus or a price — with the wealth of whoever pays it and scales the same share to your net worth, your hourly income and a median household. The reverse check scales your own gift up to their fortune. Part of Ledgerly’s Reality Check.\n\nMethodology:\n- Share = amount ÷ their net worth. Your equivalent = share × your net worth; working hours = that equivalent ÷ (your net income ÷ working hours per year).\n- Years to earn the full amount = amount ÷ your net income per year; per person = amount ÷ population.\n- Reverse check: your gift ÷ your net worth × their net worth. The optional median household uses the ECB survey’s median net wealth (euro only).\n\nPublished fortunes are estimates; pledges paid over years or through foundations are not the same as cash from personal wealth.", "tags": [ "apps" ], "x-mcp-tool": "ledgerly_relative_scale", "x-owner-app": "ledgerly", "requestBody": { "required": true, "content": { "application/json": { "schema": { "$ref": "#/components/schemas/LedgerlyRelativeScaleInput" }, "examples": { "example1": { "summary": "$100 million gift from a $50 billion fortune", "value": { "currency": "USD", "amount": 100000000, "theirWealth": 50000000000, "yourWealth": 120000, "yourIncome": 52000, "workHoursPerYear": 1800 } }, "example2": { "summary": "€1 billion pledge vs a median German household", "value": { "currency": "EUR", "amount": 1000000000, "theirWealth": 30000000000, "yourWealth": 80000, "yourIncome": 38000, "population": 83500000, "country": "DE" } }, "example3": { "summary": "Reverse: your €50 gift at a €200 billion scale", "value": { "currency": "EUR", "amount": 5000000, "theirWealth": 200000000000, "yourWealth": 60000, "yourIncome": 35000, "yourGift": 50 } } } } } }, "responses": { "200": { "description": "Calculation result envelope.", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/LedgerlyRelativeScaleResult" } } } }, "400": { "description": "Malformed JSON body.", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } }, "422": { "description": "Invalid input (see errors[]).", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } }, "429": { "description": "Rate limit exceeded (see Retry-After).", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } } } } }, "/api/v1/tool": { "get": { "operationId": "getToolDefinition", "summary": "Inputs, output schema and examples for this tool", "responses": { "200": { "description": "Tool definition.", "content": { "application/json": { "schema": { "type": "object" } } } } } } } }, "components": { "schemas": { "Problem": { "type": "object", "description": "RFC 9457 problem details. 422 responses include per-field `errors`.", "required": [ "type", "title", "status", "detail" ], "properties": { "type": { "type": "string" }, "title": { "type": "string" }, "status": { "type": "integer" }, "detail": { "type": "string" }, "code": { "type": "string" }, "errors": { "type": "array", "items": { "type": "object", "required": [ "field", "message" ], "properties": { "field": { "type": "string" }, "message": { "type": "string" } } } } } }, "LedgerlyRelativeScaleInput": { "type": "object", "additionalProperties": false, "properties": { "currency": { "title": "Currency", "type": "string", "maxLength": 3, "default": "EUR" }, "amount": { "title": "The big amount (gift, fine, price …)", "type": "number", "minimum": 0.01, "maximum": 1000000000000000, "default": 100000000 }, "theirWealth": { "title": "Net worth of the giver or payer", "type": "number", "minimum": 1, "maximum": 1000000000000000, "default": 50000000000 }, "yourWealth": { "title": "Your net worth", "type": "number", "minimum": 0, "maximum": 1000000000000000, "default": 120000 }, "yourIncome": { "title": "Your net income per year", "type": "number", "minimum": 0, "maximum": 10000000000000, "default": 42000 }, "workHoursPerYear": { "title": "Your working hours per year", "type": "number", "minimum": 1, "maximum": 5000, "default": 1700 }, "population": { "title": "Population to share it among (0 = skip)", "type": "number", "minimum": 0, "maximum": 10000000000, "default": 0 }, "yourGift": { "title": "Your own gift for the reverse check (0 = skip)", "type": "number", "minimum": 0, "maximum": 10000000000000, "default": 0 }, "country": { "title": "Also compare with a typical household in", "type": "string", "enum": [ "none", "EA", "AT", "BE", "HR", "CY", "CZ", "EE", "FI", "FR", "DE", "GR", "HU", "IE", "IT", "LV", "LT", "LU", "MT", "NL", "PT", "SK", "SI", "ES" ], "default": "none" } }, "required": [] }, "LedgerlyRelativeScaleResult": { "type": "object", "additionalProperties": false, "required": [ "schemaVersion", "tool", "computedAt", "inputs", "summary", "result", "units", "assumptions", "sources", "warnings", "presentation", "links" ], "properties": { "schemaVersion": { "type": "string", "const": "1.0" }, "tool": { "type": "object", "additionalProperties": false, "required": [ "id", "name", "version" ], "properties": { "id": { "type": "string" }, "name": { "type": "string" }, "version": { "type": "string" } } }, "computedAt": { "type": "string", "format": "date-time" }, "inputs": { "type": "object", "description": "Normalised inputs actually used, including applied defaults." }, "summary": { "type": "string" }, "result": { "type": "object", "additionalProperties": false, "required": [ "currency", "amount", "theirWealth", "share", "sharePercent", "yourEquivalent", "hourlyIncome", "workHoursEquivalent", "yearsOfIncomeForAmount", "perPerson", "reverseGift", "typicalHousehold" ], "properties": { "currency": { "type": "string" }, "amount": { "type": "number" }, "theirWealth": { "type": "number" }, "share": { "type": "number" }, "sharePercent": { "type": "number" }, "yourEquivalent": { "type": "number" }, "hourlyIncome": { "type": [ "number", "null" ] }, "workHoursEquivalent": { "type": [ "number", "null" ] }, "yearsOfIncomeForAmount": { "type": [ "number", "null" ] }, "perPerson": { "type": [ "number", "null" ] }, "reverseGift": { "type": [ "number", "null" ] }, "typicalHousehold": { "type": [ "object", "null" ], "additionalProperties": false, "required": [ "country", "medianWealth", "equivalent" ], "properties": { "country": { "type": "string" }, "medianWealth": { "type": "number" }, "equivalent": { "type": "number" } } } } }, "units": { "type": "object", "additionalProperties": { "type": "string" } }, "assumptions": { "type": "array", "items": { "type": "string" } }, "sources": { "type": "array", "items": { "type": "object", "additionalProperties": false, "required": [ "title" ], "properties": { "title": { "type": "string" }, "url": { "type": "string" }, "publisher": { "type": "string" }, "retrievedAt": { "type": "string" }, "note": { "type": "string" } } } }, "warnings": { "type": "array", "items": { "type": "string" } }, "presentation": { "type": "array", "items": { "type": "object" }, "description": "Display blocks used by the human page (same data)." }, "links": { "type": "object", "additionalProperties": false, "required": [ "human", "api", "openapi", "methodology" ], "properties": { "human": { "type": "string", "format": "uri" }, "api": { "type": "string", "format": "uri" }, "openapi": { "type": "string", "format": "uri" }, "methodology": { "type": "string", "format": "uri" } } } } } } } }