Gas

{
  "baseFeeGwei": 0.005,
  "block": 36581662,
  "chain": "Base",
  "chainId": 8453,
  "estimates": {
    "dexSwap": {
      "eth": 0.00000108,
      "gas": 180000,
      "usd": 0.00273
    },
    "erc20Transfer": {
      "eth": 3.9e-7,
      "gas": 65000,
      "usd": 0.000986
    },
    "ethTransfer": {
      "eth": 1.26e-7,
      "gas": 21000,
      "usd": 0.000318
    }
  },
  "ethUsd": 2527.2,
  "gasPriceGwei": 0.006,
  "priorityFeeGwei": 0.001
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://plainchain.appin60.com/v1/gas?chain=base'

# 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://plainchain.appin60.com/v1/gas?chain=base' \
  | 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 $0.001042 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001042" });
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 $0.001042 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fplainchain.appin60.com%2Fv1%2Fgas
const res = await pay("https://plainchain.appin60.com/v1/gas?chain=base");
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 $0.001042 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001042"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://plainchain.appin60.com/v1/gas?chain=base")
    print(res.status_code, res.text)