Gas snapshot (slow / standard / fast)

Live gas price snapshot for a chain - slow / standard / fast tiers in gwei, plus the latest base fee. Sampled from eth_feeHistory (last 4 blocks, 25th/50th/90th percentile priority fees). Use to estimate before broadcasting a transaction from another tool.

Input

Example output

{
  "network": "base",
  "chainId": 8453,
  "baseFeeGwei": 0.005,
  "slow": {
    "priorityFeeGwei": 0.001,
    "totalGwei": 0.006
  },
  "standard": {
    "priorityFeeGwei": 0.002,
    "totalGwei": 0.007
  },
  "fast": {
    "priorityFeeGwei": 0.005,
    "totalGwei": 0.01
  }
}

Try it - see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/gas-snapshot \
  -H "Content-Type: application/json" \
  -d '{"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-snapshot", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "network": "base"
  }),
});

Part of these workflows

This tool is one step in 4 curated multi-tool workflows - agents can fetch the whole sequence as an MCP prompt or call https://agent402.tools/api/skill-packs/{slug}/prompt.

• Agent wallet readiness check - One call answers 'can this wallet pay right now?' - USDC balances on Base AND Solana, live Base gas, and a ready-to-share Coinbase Onramp funding link if it's running dry.
• 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.
• DeFi dashboard - DeFi market overview: total TVL, ETH price, Base gas, and global crypto stats in one call.
• Gas optimizer - Find the cheapest gas right now: Base gas, Ethereum gas, Base fee estimate, and ETH price for USD conversion.

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