Crosstabs Fishers Exact API

openapi: 3.2.0
info:
  title: Crosstabs Public Aggregate Statistics Fishers Exact API
  version: 1.0.0
  description: 'Existing free, accountless endpoints for aggregate integer frequency counts. No respondent-row upload or private project APIs are defined here. All inferential tables require 2–12 rows and columns, rectangular shape, positive row/column margins, and grand total ≤ 1000000000000. Fractional/weighted cells are rejected. These are ordinary independent-frequency methods, not survey-design inference. Source: lib/api/contingency-handler.ts and app/api/v1 route handlers. Unknown /api paths return HTTP 404 JSON with error, code=endpoint_not_found, hint and documentation; HEAD returns the same status without a body. API schema version is separate from application and PyPI package versions. Public REST v1 compatibility policy: breaking changes use a new major URL prefix rather than silently changing /api/v1. Additive response fields may be introduced; clients should tolerate unknown fields. Current v1 endpoints are not deprecated and have no scheduled sunset. If a deprecation is scheduled, the public changelog and developer documentation will publish the affected endpoints, migration guidance and planned dates. This policy is not an availability SLA or a promise of indefinite service. See https://www.crosstabs.com/changelog and https://www.crosstabs.com/developers for published changes and migration guidance.'
  contact:
    name: Crosstabs support
    email: support@crosstabs.com
    url: https://www.crosstabs.com/support
servers:
- url: https://www.crosstabs.com
security: []
tags:
- name: Fishers Exact
paths:
  /api/v1/fishers-exact:
    options:
      operationId: optionsFishersExact
      summary: Read CORS preflight policy
      responses:
        '204':
          description: Empty response. Allows any origin, GET/POST/OPTIONS, and the Content-Type request header.
          headers:
            Access-Control-Allow-Origin:
              schema:
                type: string
                const: '*'
            Access-Control-Allow-Methods:
              schema:
                type: string
                const: GET, POST, OPTIONS
            Access-Control-Allow-Headers:
              schema:
                type: string
                const: Content-Type
      tags:
      - Fishers Exact
externalDocs:
  description: Examples, statistical limits, MCP and local CLI setup
  url: https://www.crosstabs.com/developers
x-crosstabs-interfaces:
  description: Informational Crosstabs extension, not an agent-manifest standard. MCP uses its own initialization, tools/list and tools/call protocol rather than the REST schemas below.
  openapi: https://www.crosstabs.com/openapi.json
  documentation: https://www.crosstabs.com/developers
  publicAggregateMcp:
    url: https://www.crosstabs.com/api/headless-mcp
    transport: Streamable HTTP
    toolCount: 5
    tools:
    - search
    - fetch
    - get_headless_capabilities
    - analyze_crosstab
    - render_crosstab
    maxPostBytes: 16384
    requestsPerMinutePerProcessClient: 60
    dataBoundary: Fixed public evidence and bounded aggregate counts only; no respondent rows or private projects.
  mcpSetup: https://www.crosstabs.com/mcp
  localPackage: https://pypi.org/project/crosstabs/1.5.1/
  evidence: https://www.crosstabs.com/evidence.json
  localCli:
    package: crosstabs==1.5.1
    install: pip install crosstabs==1.5.1
    command: crosstabs-headless
    transport: stdio
    dataBoundary: Local project processing; the AI client has its own data policies.