Compute where any asteroid or comet is in the sky and whether you can see it. Give a body (designation/number/name, e.g. "433 Eros", "Ceres", "2024 YR4") and optionally your lat/lon and a time (ISO, default now). Returns the body's identity (NEO/PHA flags, orbit class, absolute magnitude H), its geocentric right ascension + declination, the constellation it's in, geocentric + heliocentric distance (AU), solar phase angle, and its apparent visual magnitude (IAU H-G model — how bright it appears now). With lat/lon it adds altitude/azimuth, whether it's above your horizon, a visible-now flag (up AND sky dark), and the best viewing window in the next 24 hours (when it's highest during darkness). Orbital position is computed locally from JPL elements — VALIDATED against JPL Horizons to <0.1 arcminute. Stargazing, astrophotography planning, occultation/observation prep. For the body's static physical + orbital params see /api/space/body.
/api/space/observePAYMENT-SIGNATURE.The observe API is a pay-per-call space endpoint built for AI agents and autonomous software. Compute where any asteroid or comet is in the sky and whether you can see it.
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 observe 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 |
|---|---|---|
bodyrequired | string | min 1 chars · max 60 chars |
lat | number | min -90 · max 90 |
lon | number | min -180 · max 180 |
altKm | number | min -0.5 · max 9 |
at | string | date-time |
# 1. Probe with no auth → 402 envelope with PaymentRequirements curl -sS 'https://2s.io/api/space/observe?body=example&lat=-90&lon=-180&altKm=-0.5&at=example' # 2. Sign + retry with PAYMENT-SIGNATURE: curl -sS 'https://2s.io/api/space/observe?body=example&lat=-90&lon=-180&altKm=-0.5&at=example' \ -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/observe?body=example&lat=-90&lon=-180&altKm=-0.5&at=example'
import { TwoS } from '@2sio/sdk'
const client = new TwoS({
privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})
const result = await client.space.observe({
"body": "example",
"lat": -90,
"lon": -180,
"altKm": -0.5,
"at": "example"
})
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.observe(body="example", lat=-90, lon=-180, altKm=-0.5, at="example")
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.observe",
"arguments": {
"body": "example",
"lat": -90,
"lon": -180,
"altKm": -0.5,
"at": "example"
}
}
}| Field | Type | Description |
|---|---|---|
ok | boolean | one of: true |
items | array | |
total | integer | Total matching rows upstream; null when unknown. |
source | object |
{
"ok": true,
"items": [
{
"body": {
"fullName": "example",
"neo": false,
"pha": false,
"orbitClass": "example",
"absoluteMagnitudeH": 1
},
"at": "example",
"position": {
"rightAscensionHours": 1,
"declinationDeg": 1,
"constellation": "example",
"geocentricDistanceAu": 1,
"heliocentricDistanceAu": 1,
"phaseAngleDeg": 1,
"apparentMagnitude": 1
},
"observer": {
"altitudeDeg": 1,
"azimuthDeg": 1,
"aboveHorizon": false,
"visibleNow": false,
"bestViewing": {
"at": "example",
"altitudeDeg": 1
}
}
}
],
"total": 1,
"source": {
"provider": "example",
"url": "example",
"license": "example"
}
}