Nearest Planets

{
  "asOf": "2026-10-11T08:48:45.178Z",
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "maxDistancePc": 8,
  "notChecked": [
    "planets with no archive distance (they cannot be ranked)",
    "undiscovered planets: nearby planets are mostly found by radial velocity, which favours large close-in planets",
    "…2 more"
  ],
  "planets": [
    {
      "discoveryMethod": "Radial Velocity",
      "discoveryYear": 2016,
      "distanceLightYears": 4.244,
      "distanceParsecs": 1.30119,
      "equilibriumTempK": 218,
      "habitableZonePosition": "INSIDE_CONSERVATIVE_ZONE",
      "host": "Proxima Cen",
      "insolationEarth": 0.641,
      "massEarth": 1.055,
      "massIsMinimum": true,
      "name": "Proxima Cen b",
      "orbitalPeriodDays": 11.18465,
      "radiusEarth": 1.02,
      "semiMajorAxisAu": 0.04848,
      "sizeClass": "Earth-size",
      "starSpectralType": "M5.5 V"
    },
    {
      "discoveryMethod": "Radial Velocity",
      "discoveryYear": 2025,
      "distanceLightYears": 4.244,
      "distanceParsecs": 1.30119,
      "equilibriumTempK": 282,
      "habitableZonePosition": "TOO_HOT_INSIDE_OPTIMISTIC_INNER_EDGE",
      "host": "Proxima Cen",
      "insolationEarth": 1.814,
      "massEarth": 0.26,
      "massIsMinimum": true,
      "name": "Proxima Cen d",
      "orbitalPeriodDays": 5.12338,
      "radiusEarth": 0.692,
      "semiMajorAxisAu": 0.02881,
      "sizeClass": "sub-Earth",
      "starSpectralType": "M5.5 V"
    }
  ],
  "reasons": [
    "Ranked by the host star's distance; planets of one star share a distance.",
    "31 more match but are not listed."
  ],
  "returned": 10,
  "source": "NASA Exoplanet Archive (Caltech/IPAC)",
  "sourceUrl": "https://exoplanetarchive.ipac.caltech.edu",
  "summary": "41 confirmed planet(s) within 8 pc (26.1 light-years) with radius 0 to 1.6 Earth radii; nearest: Proxima Cen b at 4.244 light-years. 1 of the 10 listed orbit inside the conservative habitable zone.",
  "totalMatches": 41,
  "verdict": "PLANETS_LISTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://exoplanets-nasa.x402tookit.com/nearest-planets?limit=10&maxDistancePc=8&maxRadiusEarth=1.6'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://exoplanets-nasa.x402tookit.com/nearest-planets?limit=10&maxDistancePc=8&maxRadiusEarth=1.6' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fexoplanets-nasa.x402tookit.com%2Fnearest-planets
const res = await pay("https://exoplanets-nasa.x402tookit.com/nearest-planets?limit=10&maxDistancePc=8&maxRadiusEarth=1.6");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://exoplanets-nasa.x402tookit.com/nearest-planets?limit=10&maxDistancePc=8&maxRadiusEarth=1.6")
    print(res.status_code, res.text)