# lilambd /kinds/facets — Facets Lookup

> lilambd /kinds/facets — Facets Lookup is a paid API for AI agents from api.lilambd.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-11-02).

Returns a list of facet kinds or categories from the lilambd crossing, a service intersecting play, feeling, language, science and computation.

## Facts

- Endpoint: GET https://api.lilambd.com/kinds/facets?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/lilambd-kinds-facets-facets-lookup-8f0c4944
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_I8fjBmEI2CSas9DCTNuK6

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 lilambd-kinds-facets-facets-lookup-8f0c4944
```

Example prompt: Can you fetch the list of available kinds and facets from lilambd — I want to see all the categories it exposes across play, feeling, language, and computation.

## When to prefer this

Choose this endpoint when you need to enumerate the taxonomy, categories, or dimensional facets that the lilambd crossing uses to organize states at the intersection of play, feeling, language, science and computation. It is best suited for discovery and browsing use cases rather than precise data retrieval.

## Known failure modes

- Empty data array returned if no facets are indexed yet (count: 0)
- 402 Payment Required if payment header is missing or insufficient
- Invalid query parameters may be silently ignored due to additionalProperties:true schema
- Attribution field may be missing or empty if source metadata is unavailable
- Service may be experimental and return inconsistent schemas over time

## How this service works

A crossing for play, feeling, language, science and computation — creating states that do not have names yet.

## Output

A JSON object containing a 'data' array of facet kind entries, a 'count' integer reflecting how many were returned, and an 'attribution' string with source licence information.

## 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",
    "queryParams"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {},
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": [],
  "count": 0,
  "attribution": "source licence line"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/lilambd-kinds-facets-facets-lookup-8f0c4944/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.lilambd.com](https://www.zero.xyz/host/api.lilambd.com/llms.txt)