space.close-approaches

List near-Earth asteroid/comet close approaches to Earth within a date window and maximum distance, from NASA JPL's Close-Approach Data API. Filter by dateMin / dateMax (YYYY-MM-DD) and distMaxAu (max approach distance in AU; default 0.05 AU ≈ 19.5 lunar distances). Each approach: object designation, close-approach date (UTC), nominal + minimum distance in AU and lunar distances, relative velocity (km/s), and absolute magnitude H (a size proxy). Sorted nearest-first. Planetary-defense, observation planning, and "what's passing by this month" queries. Public-domain NASA/JPL data; for full physical/orbital params of a listed object see /api/space/body.

price

$0.0014 USDC per call

method

GET/api/space/close-approaches

payment

x402 v2 · USDC on Base (EIP-3009) or Solana (SPL transfer)

auth

None. Sign the payment, retry with PAYMENT-SIGNATURE.

tier

Tier 0 — no paid upstream

Parameters

Name	Type	Description
`dateMin`	string	match ^\d{4}-\d{2}-\d{2}$
`dateMax`	string	match ^\d{4}-\d{2}-\d{2}$
`distMaxAu`	number	min 0.0001 · max 1
`limit`	integer	min 1 · max 200

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/space/close-approaches?dateMin=2024-01-01&dateMax=2024-01-01&distMaxAu=0.05&limit=50'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/space/close-approaches?dateMin=2024-01-01&dateMax=2024-01-01&distMaxAu=0.05&limit=50' \
  -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/close-approaches?dateMin=2024-01-01&dateMax=2024-01-01&distMaxAu=0.05&limit=50'

TypeScript / Node — @2sio/sdktypescript

import { TwoS } from '@2sio/sdk'

const client = new TwoS({
  privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})

const result = await client.space.closeApproaches({
  "dateMin": "2024-01-01",
  "dateMax": "2024-01-01",
  "distMaxAu": 0.05,
  "limit": 50
})

console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)

Python — 2siopython

import os
from twosio import TwoS

client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])

result = client.space.close_approaches(dateMin="2024-01-01", dateMax="2024-01-01", distMaxAu=0.05, limit=50)

print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)

MCP — Claude Desktop / AgentKit / any MCP hostjson

// 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.close-approaches",
    "arguments": {
      "dateMin": "2024-01-01",
      "dateMax": "2024-01-01",
      "distMaxAu": 0.05,
      "limit": 50
    }
  }
}

Response

Field	Type	Description
`count`	number
`approaches`	array
`source`	object

Example response datajson

{
  "count": 1,
  "approaches": [
    {
      "designation": "example",
      "date": "example",
      "julianDate": 1,
      "distanceAu": 1,
      "distanceMinAu": 1,
      "distanceLd": 1,
      "relativeVelocityKmS": 1,
      "absoluteMagnitudeH": 1
    }
  ],
  "source": {
    "provider": "example",
    "url": "example",
    "license": "example"
  }
}

Discovery

/api/directory — full catalog of every endpoint
/openapi.json — OpenAPI 3.1 spec (per-op x-payment-info, x402Payment security)
/.well-known/x402 — machine-readable service descriptor for x402-aware crawlers
/.well-known/mcp/server-card.json — MCP SEP-1649 server card
/llms.txt — plain-text manifest for LLM ingestion

2s.io is x402-native. Every call is paid per-request from a USDC-funded EVM wallet on Base — no signup, no API keys, no monthly fees. Source code: github.com/2s-io/sdk.