Gas Mileage Lookup

{
  "attribution": "US DOE/EPA fuel economy database (public domain)",
  "fuel_economy": {
    "annual_fuel_cost_usd": 1600,
    "city_mpg": 26,
    "co2_tailpipe_g_per_mi": 302,
    "combined_mpg": 29,
    "fuel_type": "Regular",
    "highway_mpg": 35
  },
  "matched_variant": {
    "description": "2020 Honda Accord — Man 6-spd 1.5L",
    "vehicle_id": 42069
  },
  "offers": {
    "disclosure": "Affiliate links: they fund the free data; the price is the same for you.",
    "history_reports": [
      {
        "adds": "title brands, accidents, odometer readings, prior sales",
        "label": "EpicVIN vehicle history report",
        "partner": "epicvin",
        "pricing": "per report",
        "url": "https://forgemesh.io/go/epicvin"
      },
      {
        "adds": "title brands, accident and damage records, odometer readings, prior sales",
        "label": "Detailed Vehicle History report (10% off)",
        "partner": "dvh",
        "pricing": "per report, coupon applied",
        "url": "https://forgemesh.io/go/dvh"
      }
    ],
    "note": "Our data above is free public NHTSA/EPA data for the model year. Whether THIS VIN was wrecked, flooded, rolled back or branded salvage lives in licensed title databases; these partners sell that per VIN."
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://x402.forgemesh.io/gas-mileage-lookup' \
  -H 'content-type: application/json' \
  --data-raw '{"make":"Honda","model":"Accord","model_year":"2020"}'

# 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 - -X POST 'https://x402.forgemesh.io/gas-mileage-lookup' \
  -H 'content-type: application/json' \
  --data-raw '{"make":"Honda","model":"Accord","model_year":"2020"}' \
  | 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fx402.forgemesh.io%2Fgas-mileage-lookup&method=POST
const res = await pay("https://x402.forgemesh.io/gas-mileage-lookup", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "make": "Honda",
    "model": "Accord",
    "model_year": "2020"
  }),
});
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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://x402.forgemesh.io/gas-mileage-lookup",
        json={
            "make": "Honda",
            "model": "Accord",
            "model_year": "2020",
        },
    )
    print(res.status_code, res.text)