Transit Depth

{
  "asOf": "2026-10-11T08:48:48.123Z",
  "degraded": false,
  "depthFraction": 0.00008405,
  "depthPercent": 0.008405,
  "depthPpm": 84.05,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "formula": "depth = (Rp / Rs)^2",
  "notChecked": [
    "limb darkening, which deepens the real centre-of-transit dip by tens of percent",
    "starspots, flares and other stars blended into the light curve",
    "…2 more"
  ],
  "planetRadiusKm": 6378.1,
  "radiusRatio": 0.0091679,
  "reasons": [
    "Radii use IAU nominal equatorial values: Earth 6378.1 km, Jupiter 71492 km, Sun 695700 km."
  ],
  "semiMajorAxisAu": 1,
  "source": "computed locally",
  "starRadiusKm": 695700,
  "summary": "A 1 earth-radius planet crossing a 1 solar-radius star blocks 0.00841% of the light (84.1 ppm). The transit lasts about 13.1 hours at impact parameter 0 (orbit 1 au).",
  "transitDurationFormula": "T = (P / pi) asin( sqrt((Rs + Rp)^2 - (b Rs)^2) / a )",
  "transitDurationHours": 13.1,
  "verdict": "COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://exoplanets-nasa.x402tookit.com/transit-depth?periodDays=365.25&planetRadius=1&planetUnit=earth&starMassSolar=1&starRadiusSolar=1'

# 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/transit-depth?periodDays=365.25&planetRadius=1&planetUnit=earth&starMassSolar=1&starRadiusSolar=1' \
  | 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%2Ftransit-depth
const res = await pay("https://exoplanets-nasa.x402tookit.com/transit-depth?periodDays=365.25&planetRadius=1&planetUnit=earth&starMassSolar=1&starRadiusSolar=1");
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/transit-depth?periodDays=365.25&planetRadius=1&planetUnit=earth&starMassSolar=1&starRadiusSolar=1")
    print(res.status_code, res.text)