The free SpaceNexus API

Plans and limits

Which plan a key runs on follows its owner's paid subscription at the moment of the call: upgrade and the same keys get the Professional limits at once; if a subscription ends, or during a free trial, the keys run on the free plan, and on the free plan only your 2 oldest active keys work (others answer 403 KEY_OVER_PLAN_LIMIT). Minute, day and month limits are UTC clock windows. They count per key and, at the per-key limits times the key cap, across all your keys together, revoked and rotated ones included, so new keys never reset a budget. Successful answers, 429s and 403s all say which plan answered in the X-API-Plan header. Past a limit you get a 429 with Retry-After; a free key calling a Professional endpoint gets a 403 with the code SUBSCRIPTION_REQUIRED.

No key at all? The open JSON feeds need none (60 requests a minute per IP), and every dataset downloads as CSV or JSON without an account (30 files per 10 minutes per IP).

Get started

1. Create a free account (or sign in).
2. Verify your email address (the link in your welcome email), then open My Desk, API keys and create a key. It is shown once: copy it then. We store only a SHA-256 hash of it, so we cannot show it again; if you lose it, rotate it (the key keeps its usage and limits; only the secret changes).
3. Send it as Authorization: Bearer snx_... or X-API-Key: snx_..., from a server or a script, never from a web page.

curl "https://spacenexus.us/api/v1/launches?limit=5" \
  -H "Authorization: Bearer snx_YOUR_API_KEY"

import requests

r = requests.get(
    "https://spacenexus.us/api/v1/executive-moves",
    params={"limit": 10},
    headers={"X-API-Key": "snx_YOUR_API_KEY"},
    timeout=30,
)
r.raise_for_status()
for row in r.json()["data"]:
    print(row["date"][:10], row["personName"], row["moveType"], row["sourceUrl"])

// Server-side only: never ship a key to a browser.
const res = await fetch('https://spacenexus.us/api/v1/space-weather', {
  headers: { Authorization: `Bearer ${process.env.SPACENEXUS_API_KEY}` },
});
if (res.status === 429) {
  console.log('Rate limited; retry after', res.headers.get('Retry-After'), 's');
}
const { data } = await res.json();

Endpoints

Parameters, response shapes and examples for each: the full reference. Research exports (full history, portfolios, screens) are part of SpaceNexus Research and are not in the API.

Licence and attribution

SpaceNexus data is CC BY 4.0: use it in anything, commercial or not, as long as you credit it. Wherever you show or publish it, put “Data: SpaceNexus (spacenexus.us)” with a link to spacenexus.us (in an app's about screen, a chart caption or a notebook's sources). Facts we take from others are not ours to license, and we never relabel them:

• /api/v1/launches: Launch facts from Launch Library 2 by The Space Devs: credit them; not relicensed by SpaceNexus.
• /api/v1/launch-vehicles: SpaceNexus compilation, CC BY 4.0.
• /api/v1/companies: SpaceNexus compilation, CC BY 4.0. No stock quote data.
• /api/v1/executive-moves: SpaceNexus compilation, CC BY 4.0; each row links its primary source.
• /api/v1/space-weather: NASA DONKI (flares, storms, CMEs) and NOAA Space Weather Prediction Center (Kp) data, US government works, summarised by SpaceNexus.

Terms of the free API

• Keys are personal to your account. Keep them secret and server-side. You can rotate or revoke a key at any time from My Desk; a revoked key stops working at once.
• Stay within the limits. Do not open extra accounts or share keys to get around them; cache answers on your side instead. Keys used to get around the limits, or to overload the service, may be revoked.
• The data you receive stays under its licence: CC BY 4.0 for ours, with the attribution above, and the provider's own terms for credited third-party facts.
• The free API is provided as is, without an uptime guarantee. Numbers carry their sources and dates; check anything you rely on, and report errors.
• If the limits or these terms change, this page is updated, with the date.
• Money never touches the data: no response has a sponsored row, a paid field or a paid order, on any plan. The site's general terms of service also apply.

Last updated 26 September 2026.