# 2s.io Sky Watch — Integrated Sky Digest

> 2s.io Sky Watch — Integrated Sky Digest is a paid API for AI agents from 2s.io, paid per call via x402, $0.00288/call, status unknown (last checked 2026-09-14).

Returns a synthesized sky digest for a given lat/lon: sun/moon almanac, visible naked-eye planets above the horizon, near-Earth asteroid close approaches for the next 7 days, and live ISS position with visibility check.

## Facts

- Endpoint: GET https://2s.io/api/space/skywatch
- Price: $0.00288/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/2s-io-sky-watch-integrated-sky-digest-f30c010e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OIPCIPoLcbJdiSBtnq-Vz

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 2s-io-sky-watch-integrated-sky-digest-f30c010e
```

Example prompt: What's worth looking at in the sky right now from latitude 37.77 and longitude -122.42 — what planets are up, is the ISS visible, and are there any asteroid flybys this week?

## When to prefer this

Use this endpoint when you need a single, synthesized sky overview combining planets, moon, sun, ISS, and asteroid data for a specific observer location — rather than calling separate astronomy APIs. Prefer /api/space/sky-tonight if you only need the raw almanac without ISS or asteroid data.

## Known failure modes

- Missing lat or lon query parameters returns an error for those sections
- Invalid lat/lon values outside -90/90 and -180/180 range cause validation failure
- Upstream NASA or ISS data source temporarily unavailable — affected section reports error while others succeed
- Extreme observer elevations may produce edge-case horizon calculations

## How this service works

One call → what's notable in YOUR sky right now, for a lat/lon. Synthesizes three sources: (1) the live almanac — sun up/down, moon phase + illumination, and which of the 7 naked-eye planets are currently above your horizon with their altitude/azimuth/magnitude; (2) near-Earth asteroid close approaches over the next 7 days (designation, date, distance in lunar distances); and (3) the ISS — its current sub-point, and whether it is above your horizon right now with look angles. Each section reports found/error independently. The "is it dark, what's up, anything passing" digest for stargazers and astrophotographers. For the raw almanac alone see /api/space/sky-tonight.

## Output

A structured digest with three independent sections: (1) almanac — sun rise/set, moon phase and illumination percentage, and a list of naked-eye planets currently above the horizon with altitude, azimuth, and magnitude; (2) asteroid close approaches — list of near-Earth objects over the next 7 days with designation, closest approach date, and distance in lunar distances; (3) ISS — current ground sub-point coordinates and whether it is presently above the observer's horizon with look angles (azimuth, elevation). Each section reports success or error independently.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "lat": 37.77,
   "lon": -122.42,
   "altitudeM": 0
  }
 }
}
```

## 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": {
     "const": "http"
    },
    "method": {
     "const": "GET"
    },
    "queryParams": {
     "required": [
      "lat",
      "lon"
     ],
     "properties": {
      "lat": {
       "type": "number",
       "maximum": 90,
       "minimum": -90
      },
      "lon": {
       "type": "number",
       "maximum": 180,
       "minimum": -180
      },
      "altitudeM": {
       "type": "number",
       "description": "Observer elevation in meters (default 0)."
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/2s-io-sky-watch-integrated-sky-digest-f30c010e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 2s.io](https://www.zero.xyz/host/2s.io/llms.txt)