Elevation Profile

{
  "asOf": "2026-10-11T03:48:06.717Z",
  "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.",
  "lengthMeters": 17930,
  "notChecked": [
    "terrain between samples",
    "obstacles and vegetation",
    "…1 more"
  ],
  "profile": [
    {
      "elevationFeet": 5237.7,
      "lat": 39.7392,
      "lon": -104.9903
    },
    {
      "elevationFeet": 5307.3,
      "lat": 39.7392,
      "lon": -105.03224
    }
  ],
  "reasons": [
    "Grade is measured between sample points; terrain between them can be steeper.",
    "6 of 6 samples returned data."
  ],
  "reliefFeet": 621.5,
  "samples": 6,
  "source": "USGS 3DEP Elevation Point Query Service",
  "sourceUrl": "https://epqs.nationalmap.gov",
  "steepestSegment": {
    "from": {
      "lat": 39.7392,
      "lon": -105.15806
    },
    "gradePct": 1.5,
    "to": {
      "lat": 39.7392,
      "lon": -105.2
    }
  },
  "summary": "17.93 km line: relief 622 ft (5238 to 5859 ft), steepest segment 1.5% grade: flat.",
  "thresholds": {
    "gentleOverPct": 2,
    "moderateOverPct": 5,
    "steepOverPct": 15,
    "veryOverPct": 25
  },
  "totalAscentFeet": 621.5,
  "totalDescentFeet": 0,
  "verdict": "FLAT"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://land-survey.x402tookit.com/elevation-profile?lat1=39.7392&lat2=39.7392&lon1=-104.9903&lon2=-105.2&points=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://land-survey.x402tookit.com/elevation-profile?lat1=39.7392&lat2=39.7392&lon1=-104.9903&lon2=-105.2&points=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 $0.03 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.03" });
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 $0.03 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fland-survey.x402tookit.com%2Felevation-profile
const res = await pay("https://land-survey.x402tookit.com/elevation-profile?lat1=39.7392&lat2=39.7392&lon1=-104.9903&lon2=-105.2&points=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 $0.03 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.03"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://land-survey.x402tookit.com/elevation-profile?lat1=39.7392&lat2=39.7392&lon1=-104.9903&lon2=-105.2&points=6")
    print(res.status_code, res.text)