# Family Office Knowledge Graph API

> Family Office Knowledge Graph API is a paid API for AI agents from familyofficeknowledgegraph.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).

Returns a signed, verifiable record node (LEI, legal name, aliases, register IDs, field states, as-of timestamp) from the Family Office Knowledge Graph index for $0.01 USDC per lookup.

## Facts

- Endpoint: GET https://familyofficeknowledgegraph.ai/api?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/family-office-knowledge-graph-api-c7e964d1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__W5z24WeqsPy2LmJlAY4V

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 family-office-knowledge-graph-api-c7e964d1
```

Example prompt: Pull the signed identity record for Rockefeller Capital Management from the Family Office Knowledge Graph — I need their LEI, legal name, any aliases, and register IDs as of today.

## When to prefer this

Choose this endpoint when you need authoritative, cryptographically signed identity records (LEI, legal name, aliases, register IDs) specifically for family office entities, and when tamper-evident provenance (EdDSA signature + permanent receipt) is required. It is purpose-built for the family office segment of private wealth, making it more targeted than generic LEI registries or broad corporate entity databases.

## Known failure modes

- Entity not found in the knowledge graph — returns an empty or error response
- Invalid or missing required input parameters (type or method) — returns a 400-level error
- Payment not processed or insufficient USDC — returns a 402 Payment Required
- Nonce receipt URL not yet propagated — receipt may take a moment to resolve after payment

## How this service works

The Family Office Knowledge Graph index of record for $0.01 USDC — every node's record list (LEI, legal name, aliases, register ids, field states, as-of) as a signed statement (EdDSA, kid fo-kg-x402-2026-09) with a receipt that resolves forever at /x402/receipt/{nonce}. Operator: Agentic KG Holdings.

## Output

A cryptographically signed statement (EdDSA, key ID fo-kg-x402-2026-09) containing the entity node's LEI, legal name, aliases, register IDs, field states, and as-of timestamp, along with a permanent receipt URL at /x402/receipt/{nonce} that resolves forever.

## 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"
     ],
     "type": "string"
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/family-office-knowledge-graph-api-c7e964d1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from familyofficeknowledgegraph.ai](https://www.zero.xyz/host/familyofficeknowledgegraph.ai/llms.txt)