# Lilambd Koyomi Solar Terms API

> Lilambd Koyomi Solar Terms API 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 all 24 traditional East Asian solar terms (sekki/jieqi) for a given year, including their dates and descriptions.

## Facts

- Endpoint: GET https://api.lilambd.com/koyomi/solar-terms?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-koyomi-solar-terms-api-6c4d3cad
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zNoAMuWKMTbzz1-NXRHL2

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-koyomi-solar-terms-api-6c4d3cad
```

Example prompt: Can you list all 24 solar terms and their dates for 2025? I want the traditional East Asian koyomi seasonal calendar for the whole year.

## When to prefer this

Choose this endpoint when you need structured, dated listings of the 24 traditional East Asian solar terms (Chinese jieqi / Japanese sekki) for a specific Gregorian year. Prefer it over general calendar APIs when East Asian traditional seasonal divisions are specifically required, or when you need machine-readable solar term data with attribution for use in cultural, agricultural, or wellness applications.

## Known failure modes

- Missing required 'year' query parameter returns an error
- Non-integer or out-of-range year value may return an empty data array or error
- Year far outside historical or computed range may yield no results
- Network or payment authorization failure (x402) if USDC payment is not properly handled

## 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 solar term entries for the requested year (with dates, names, and descriptions), a count of terms returned, and an attribution string crediting the data source license.

## 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": [
      "year"
     ],
     "properties": {
      "year": {
       "type": "string",
       "description": "year (integer)"
      }
     },
     "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-koyomi-solar-terms-api-6c4d3cad/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)