# lilambd Quantity Kinds Lookup

> lilambd Quantity Kinds Lookup is a paid API for AI agents from api.lilambd.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-11-02).

Returns a list of quantity kinds (physical or conceptual measurement dimensions) with attribution metadata

## Facts

- Endpoint: GET https://api.lilambd.com/units/quantity-kinds?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/lilambd-quantity-kinds-lookup-69a8dbca
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KjQaX6x6TJci5WHc8fzoc

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-quantity-kinds-lookup-69a8dbca
```

Example prompt: Can you fetch the list of quantity kinds from lilambd so I can see all the measurement dimensions available and who the data is attributed to?

## When to prefer this

Choose this endpoint when you need a structured catalogue of measurement quantity kinds (e.g. length, mass, temperature, luminosity) with source attribution, particularly in scientific or metrological workflows. Prefer it over generic ontology APIs when you specifically need the lilambd crossing's curated intersection of physical and conceptual quantity dimensions.

## Known failure modes

- Empty data array with count 0 if no quantity kinds are indexed yet
- HTTP 402 Payment Required if the x402 payment header is missing or insufficient
- Malformed response if query parameters contain unsupported keys
- Rate limiting or timeout if the service is under load

## 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 an array of quantity kind records under 'data', an integer 'count' of how many were returned, and an 'attribution' string crediting the data source licence.

## 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-quantity-kinds-lookup-69a8dbca/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)