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.
/api/space/skywatchPAYMENT-SIGNATURE.The skywatch API is a pay-per-call space endpoint built for AI agents and autonomous software. One call → what's notable in YOUR sky right now, for a lat/lon.
There is no signup and no API key. An agent (or any HTTP client) hits the endpoint, receives an x402 "402 Payment Required" challenge, signs a sub-cent USDC payment on Base or Solana, and retries — the data comes back on the paid request. That makes it a drop-in skywatch data source for an agent tool-use loop, an MCP host, or a backend that needs space data on demand without onboarding to yet another vendor portal.
| Name | Type | Description |
|---|---|---|
latrequired | number | min -90 · max 90 |
lonrequired | number | min -180 · max 180 |
altitudeM | number | min -500 · max 9000 |
# 1. Probe with no auth → 402 envelope with PaymentRequirements curl -sS 'https://2s.io/api/space/skywatch?lat=-90&lon=-180&altitudeM=0' # 2. Sign + retry with PAYMENT-SIGNATURE: curl -sS 'https://2s.io/api/space/skywatch?lat=-90&lon=-180&altitudeM=0' \ -H 'PAYMENT-SIGNATURE: <base64-json-payload>' # Or use the canonical runner (handles probe → sign → retry): # EVM_PRIVATE_KEY=0x... node --env-file=.env.local \ # --experimental-strip-types scripts/x402-pay.ts \ # 'https://2s.io/api/space/skywatch?lat=-90&lon=-180&altitudeM=0'
import { TwoS } from '@2sio/sdk'
const client = new TwoS({
privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})
const result = await client.space.skywatch({
"lat": -90,
"lon": -180,
"altitudeM": 0
})
console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)import os
from twosio import TwoS
client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])
result = client.space.skywatch(lat=-90, lon=-180, altitudeM=0)
print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)// 1. Add @2sio/mcp to your MCP host config (Claude Desktop example below).
// EVM_PRIVATE_KEY funds x402 payments per call.
// claude_desktop_config.json
{
"mcpServers": {
"2sio": {
"command": "npx",
"args": ["-y", "@2sio/mcp"],
"env": { "EVM_PRIVATE_KEY": "0x..." }
}
}
}
// 2. Once the server is running, agents call this tool via standard MCP:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "space.skywatch",
"arguments": {
"lat": -90,
"lon": -180,
"altitudeM": 0
}
}
}| Field | Type | Description |
|---|---|---|
at | string | |
observer | object | |
sky | object | |
closeApproaches | object | |
iss | object | |
sources | array |
{
"at": "example",
"observer": {
"lat": 1,
"lon": 1,
"altitudeM": 1
},
"sky": {
"isDark": false,
"sun": {},
"moon": {},
"planetsUp": [
{}
]
},
"closeApproaches": {
"found": false,
"error": "example",
"count": 1,
"approaches": [
{}
]
},
"iss": {
"found": false,
"error": "example",
"aboveHorizon": false,
"geodetic": {},
"look": {}
},
"sources": [
{}
]
}