Gas price

Current gas price (gwei and wei) on Base, Polygon, Arbitrum, Optimism, or Ethereum — for an agent budgeting a transaction. Read-only. ?network=base

Input

Field	Type	Description
network	string	chain: base | polygon | arbitrum | optimism | ethereum (default base)

Example output

{
  "network": "base",
  "gasPriceGwei": "0.0051",
  "gasPriceWei": "5100000"
}

Try it — see the 402 challenge (free)

curl -i "https://agent402.tools/api/gas-estimate?network=base"

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/gas-estimate?network=base");

Wallet-only. This tool reaches the network/browser/storage, so it is paid in USDC via x402 (no proof-of-work tier).

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