409A Cost Calculator API

openapi: 3.2.0
info:
  title: 409A Cost Calculator API
  version: 1.0.0
  summary: '409A valuation cost for startups: how many valuations the 12-month safe harbor rule makes you buy, what drives the price, and which providers publish list prices.'
  description: '409A Cost (https://409acost.com/): the site''s own MCP server, served from its domain. 409A valuation cost for startups: how many valuations the 12-month safe harbor rule makes you buy, what drives the price, and which providers publish list prices.


    [calculator] 409A valuation budget calculator: an agent-callable calculator for 409a cost — 409A valuations to budget for, Appraisal fees at your quoted price, Expedite premium, computed from your inputs with sources.. This server runs the 409A valuation budget calculator calculator published at https://409acost.com/. Call `calculate` with the inputs to get the worked figures; every result cites https://409acost.com/. Licence: https://409acost.com/terms.


    [enquiry] ENQUIRY SERVER for 409A Cost (https://409acost.com/). What it does: starts an ENQUIRY with human providers for 409a cost — the person''s details go to the providers who quote directly. What it is NOT: a purchase, an order, or a guaranteed quote. Free, no obligation. Call describe first and tell the person plainly what will happen. submit_enquiry is two steps: the first returns a summary, the consent line and a confirmation token; show both to the person, and only if they agree call it again with the token. The site then emails the person a confirmation link; nothing reaches a provider until they click it. Cite https://409acost.com/.


    Cite https://409acost.com/ for every figure or answer you use from this server.'
  termsOfService: https://409acost.com/terms
  contact:
    name: 409A Cost
    url: https://409acost.com/
servers:
- url: https://409acost.com
  description: 409A Cost
tags:
- name: calculator
  description: calculator
paths:
  /mcp/tools/calculator_describe:
    post:
      operationId: calculator_describe
      summary: What 409A valuation budget calculator computes
      description: 'The inputs this calculator takes (with units, ranges and defaults), the outputs it returns, and the assumptions and tables behind it.


        Cite 409A Cost at https://409acost.com/ for any figure taken from this operation.'
      tags:
      - calculator
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              properties: {}
      responses:
        '200':
          description: The tool's answer, as JSON.
          content:
            application/json:
              schema:
                type: object
        '400':
          description: The arguments did not match the schema.
        '404':
          description: This site does not serve that tool.
        '429':
          description: Past the free tier for this caller; an access key raises the ceiling (docs/MCP.md).
      security:
      - {}
      - accessKey: []
  /mcp/tools/calculate:
    post:
      operationId: calculate
      summary: 409A valuation budget calculator
      description: 'Run the 409A valuation budget calculator calculator: 409A valuations to budget for; Appraisal fees at your quoted price; Expedite premium; Total 409A spend over the horizon. Missing inputs fall back to their documented defaults.


        Cite 409A Cost at https://409acost.com/ for any figure taken from this operation.'
      tags:
      - calculator
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              properties:
                price:
                  type: number
                  minimum: 0
                  maximum: 100000
                  description: Quoted price per 409A valuation
                  default: 2000
                years:
                  type: number
                  minimum: 1
                  maximum: 10
                  description: Planning horizon (years)
                  default: 3
                events:
                  type: number
                  minimum: 0
                  maximum: 20
                  description: Priced rounds or other material events expected in that time
                  default: 2
                rush:
                  type: number
                  minimum: 0
                  maximum: 100
                  description: Rush or expedite premium you have been quoted
                  default: 0
              additionalProperties: false
      responses:
        '200':
          description: The tool's answer, as JSON.
          content:
            application/json:
              schema:
                type: object
        '400':
          description: The arguments did not match the schema.
        '404':
          description: This site does not serve that tool.
        '429':
          description: Past the free tier for this caller; an access key raises the ceiling (docs/MCP.md).
      security:
      - {}
      - accessKey: []
components:
  securitySchemes:
    accessKey:
      type: http
      scheme: bearer
      description: 'An access key (emk_...): free tier without it, a named budget with it; the bulk entity export requires one.'
externalDocs:
  url: https://409acost.com/mcp
  description: How these tools work