Climate Projection

{
  "baseline": {
    "annual_precip_mm": 1070,
    "frost_days_per_year": 94.5,
    "hot_days_over_30c_per_year": 25.7,
    "hottest_day_c": 39.2,
    "mean_temp_c": 11.52,
    "years": "1991-2000"
  },
  "change": {
    "annual_precip_mm": 63,
    "frost_days_per_year": -27.2,
    "hot_days_per_year": 15,
    "mean_temp_c": 2.04
  },
  "lat": 40.7128,
  "lon": -74.006,
  "note": "single high-resolution climate model (EC-Earth3P-HR, ~29 km grid, high-emissions pathway to 2050); the 10-year windows smooth year-to-year noise but this is one model, not an ensemble",
  "source": "Open-Meteo Climate API (CMIP6 HighResMIP)",
  "target": {
    "annual_precip_mm": 1133,
    "frost_days_per_year": 67.3,
    "hot_days_over_30c_per_year": 40.7,
    "hottest_day_c": 41.2,
    "mean_temp_c": 13.56,
    "years": "2036-2045"
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://saylorinnovations.com/api/climate/projection?lat=40.7128&lon=-74.006&year=2040'

# 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://saylorinnovations.com/api/climate/projection?lat=40.7128&lon=-74.006&year=2040' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fsaylorinnovations.com%2Fapi%2Fclimate%2Fprojection
const res = await pay("https://saylorinnovations.com/api/climate/projection?lat=40.7128&lon=-74.006&year=2040");
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://saylorinnovations.com/api/climate/projection?lat=40.7128&lon=-74.006&year=2040")
    print(res.status_code, res.text)