# AnswerPool Subsidiary Tree

> AnswerPool Subsidiary Tree is a paid API for AI agents from answerpool.io, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Returns all subsidiary names and jurisdictions extracted from a public company's latest SEC Exhibit 21 (annual report subsidiary list), with a link to the source filing for verification.

## Facts

- Endpoint: GET https://answerpool.io/v1/graph/subsidiaries
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/answerpool-subsidiary-tree-cb19b5cd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_U15aw_ZGsVxjPfi5caqu_

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability answerpool-subsidiary-tree-cb19b5cd
```

Example prompt: Pull the full subsidiary list for Apple — ticker AAPL — from their latest annual report Exhibit 21, and show me each subsidiary name and the jurisdiction it's registered in.

## When to prefer this

Use this endpoint when you need to rapidly enumerate the legal subsidiaries of any SEC-reporting public company without manually locating and parsing EDGAR filings. It is the best choice for due diligence workflows, compliance audits, corporate structure mapping, or competitive research where the source of truth is the company's own SEC-filed Exhibit 21. Prefer it over general EDGAR search when you want structured, pre-parsed subsidiary rows rather than raw filing documents.

## Known failure modes

- Company not found — invalid ticker or CIK returns an error or empty result
- Company has not filed an Exhibit 21 — some filers are exempt and the endpoint may return null or a note
- Heuristic parsing errors — subsidiary names or jurisdictions may be mis-extracted from non-standard exhibit formats
- Stale data — if the latest annual report is several months old, the subsidiary list may not reflect recent M&A
- Rate limiting or payment failure — x402 payment not processed results in a 402 or auth error

## How this service works

AnswerPool turns SEC EDGAR, the Federal Register, USAspending, NIH, BLS and OpenAlex into structured JSON answers that AI agents and developers fetch in one call. 69 endpoints free, no account; derived analyses $0.02–$0.05 per call by card credits or USDC (x402). MCP server, full provenance.

## Output

A structured list of all subsidiaries extracted from the company's most recent Exhibit 21, including each subsidiary's name and jurisdiction of incorporation. Also returns the parent company's CIK, full name, filing accession number, filing date, an as-of date, a direct URL to the source SEC exhibit for verification, a total count, and any parsing notes or disclaimers.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "title": "SubsIn",
     "properties": {
      "cik": {
       "anyOf": [
        {
         "type": "string",
         "pattern": "^\\d{1,10}$",
         "maxLength": 10
        },
        {
         "type": "null"
        }
       ],
       "title": "Cik",
       "default": null,
       "description": "SEC CIK of the parent registrant, 1-10 digits, zero padding optional (e.g. 320193). Provide exactly one of cik or ticker."
      },
      "limit": {
       "type": "integer",
       "title": "Limit",
       "default": 200,
       "maximum": 500,
       "minimum": 1,
       "description": "Maximum subsidiary rows returned, in the order they appear in the Exhibit 21 table. Default 200."
      },
      "ticker": {
       "anyOf": [
        {
         "type": "string",
         "maxLength": 12
        },
        {
         "type": "null"
        }
       ],
       "title": "Ticker",
       "default": null,
       "description": "US exchange ticker, case-insensitive (e.g. AAPL); resolved through the EDGAR ticker map, and an unknown ticker is an error. Provide exactly one of ticker or cik."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "cik": "0000320193",
  "name": "Apple Inc.",
  "note": null,
  "as_of": "2026-09-02T22:00:00Z",
  "count": 1,
  "filed": "2025-11-01",
  "accession": "0000320193-25-000123",
  "source_url": "https://www.sec.gov/Archives/edgar/data/320193/000032019325000123/ex21.htm",
  "subsidiaries": [
   {
    "name": "Apple Operations International Ltd.",
    "jurisdiction": "Ireland"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/answerpool-subsidiary-tree-cb19b5cd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from answerpool.io](https://www.zero.xyz/host/answerpool.io/llms.txt)