Gas price

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

Input

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");

Part of these workflows

This tool is one step in 2 curated multi-tool workflows - agents can fetch the whole sequence as an MCP prompt or call https://agent402.tools/api/skill-packs/{slug}/prompt.

• Cheapest rail right now - Where should an agent transact this minute? Live gas on Ethereum + every major L2 side by side, Base gas tiers, a fee estimate for your transaction type, and ETH spot to price it all in dollars.
• Gas optimizer - Find the cheapest gas right now: Base gas, Ethereum gas, Base fee estimate, and ETH price for USD conversion.

Related tools