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API · /schwarzschild-api

Black Hole Physics API

healthy 4,656 Subscribers

Black-hole general-relativity maths as an API, computed locally and deterministically. The radius endpoint computes the Schwarzschild radius r_s = 2GM/c² — the event horizon of a non-rotating black hole — from a mass given in kilograms or solar masses, together with the photon sphere at 1.5·r_s and the innermost stable circular orbit (ISCO) at 3·r_s; the Sun would have an event horizon about 2.95 km across and the Earth about 9 mm. The time-dilation endpoint computes the gravitational time-dilation factor √(1 − r_s/r) at a distance r from a mass — a clock deep in a gravity well ticks slower than a far-away clock, and at the horizon time appears to stop. The hawking endpoint computes the Hawking temperature T = ħc³/(8πGMk_B), which is higher for smaller black holes, and the evaporation time, which scales as the cube of the mass — a solar-mass black hole would take about 10^67 years to evaporate. Masses are in kilograms or solar masses and distances in metres, using G, c, ħ and the Boltzmann constant. Everything is computed locally and deterministically, so it is instant and private. Ideal for astrophysics, cosmology, science-communication, simulation and education app developers, black-hole and relativity tools, and physics teaching. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is general-relativity black-hole physics; for special relativity (Lorentz factor, E=mc²) use a relativity API.

#black-hole #schwarzschild #general-relativity #hawking #astrophysics #developer-tools
api.oanor.com/schwarzschild-api
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Machine-readable spec so AI agents can integrate this API.

/api/schwarzschild-api/openapi.json
/api/schwarzschild-api/llms.txt

Discovery: GET /api/index.json lists every API.

Black Hole Physics API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
81 ms
Server probes · 24h
Subscribers
4,656
active
Total calls
76
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 3,750 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 3,750 calls/month
  • 2 req/sec
  • Radius + time dilation + Hawking
  • No credit card
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Starter

€5.00 /month

  • 35,500 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 35,500 calls/month
  • 6 req/sec
  • Photon sphere, ISCO, evaporation
  • Email support
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Pro

€14.00 /month

  • 216,500 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 216,500 calls/month
  • 15 req/sec
  • Cosmology & simulation pipelines
  • Priority support
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Mega

€44.00 /month

  • 1,305,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,305,000 calls/month
  • 40 req/sec
  • Platform scale
  • Dedicated SLA
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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Black Hole Physics API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Black Hole Physics API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Black Hole Physics API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Black Hole Physics API cost?
Black Hole Physics API has a free tier with 100 calls / month. Paid plans start at €5.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Black Hole Physics API GDPR-compliant?
All requests to Black Hole Physics API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

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Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/schwarzschild-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/schwarzschild-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/schwarzschild-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/schwarzschild-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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