Base gas price API: base fee, priority fee and EIP-1559 suggestions

$0.002 per call · failed calls are never charged · no account or subscription: pay per call with a card key or USDC

Live gas prices on Base (chain 8453) read from the latest block: base fee and priority fee in gwei, suggested maxFeePerGas and maxPriorityFeePerGas in wei for an EIP-1559 transaction, how full the latest block is, and the estimated execution fee in ETH for an ETH transfer and an ERC-20 transfer. Use before sending a transaction on Base or to decide whether to wait for lower fees.

When to use it

Guide: Gas price API

Run it free (25 free calls) Buy credits by card (from $1) Example result (JSON)

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/base-gas?format=json"

Or one of your 25 free calls, no key:

curl "https://tools.funwords.eu/base-gas?format=json&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "chain": "base",
  "chainId": 8453,
  "blockNumber": 37000000,
  "blockTime": "2026-10-13T09:12:01.000Z",
  "baseFeeGwei": "0.0052",
  "priorityFeeGwei": "0.001",
  "gasPriceGwei": "0.0062",
  "suggested": {
    "maxFeePerGasWei": "11400000",
    "maxPriorityFeePerGasWei": "1000000"
  },
  "blockUsedPercent": 31.4,
  "estimatedExecutionFeeEth": {
    "ethTransfer": "0.0000001302",
    "erc20Transfer": "0.000000403"
  },
  "checkedAt": "2026-10-13T09:12:02.000Z"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is base_gas, and the first 25 successful calls are free:

https://tools.funwords.eu/mcp

Questions

Does it need any input?

No. It reads the latest Base block (chain 8453) and reports how full it is.

Is this the same as /base/gas?

/base/gas is paused and points here: this tool has the same Base gas data plus the EIP-1559 fee suggestions.

How do I pay?

Each successful call costs $0.002; failed calls are not charged. The first 25 calls are free. Then pay with card credits (from $1; the key goes in an Authorization header or, for clients that can only fetch a URL, as api_key= in the URL) or per call in USDC over x402 or MPP. No account is needed.

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