Seismic Wave Times

{
  "asOf": "2026-10-11T08:35:43.125Z",
  "degraded": false,
  "depthKm": 10,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "epicentralDistanceKm": 100,
  "hypocentralDistanceKm": 100.5,
  "method": "Constant-velocity homogeneous crust (Vp 6.0, Vs 3.5 km/s unless overridden)",
  "notChecked": [
    "real travel times: the Earth speeds up with depth, so beyond about 1000 km a constant-speed estimate is too slow (real P at 1000 km is closer to 2 minutes than 2.8)",
    "surface waves, which carry most shaking energy and arrive after S",
    "…2 more"
  ],
  "pArrivalSeconds": 16.7,
  "reasons": [
    "Homogeneous-crust approximation, usually within tens of percent at regional distances.",
    "Hypocentral distance used: 100.5 km (flat-earth combination of distance and depth)."
  ],
  "sArrivalSeconds": 28.7,
  "source": "computed locally",
  "spLagSeconds": 12,
  "summary": "At 100 km (depth 10 km): P arrives about 16.7 s after the origin, S about 28.7 s, a 12 s gap.",
  "verdict": "ESTIMATE",
  "vpKmS": 6,
  "vsKmS": 3.5
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://global-hazards.x402tookit.com/seismic-wave-times?depthKm=10&distanceKm=100'

# 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://global-hazards.x402tookit.com/seismic-wave-times?depthKm=10&distanceKm=100' \
  | 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%2Fglobal-hazards.x402tookit.com%2Fseismic-wave-times
const res = await pay("https://global-hazards.x402tookit.com/seismic-wave-times?depthKm=10&distanceKm=100");
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://global-hazards.x402tookit.com/seismic-wave-times?depthKm=10&distanceKm=100")
    print(res.status_code, res.text)