Live gas price on Ethereum, Base, Arbitrum, Optimism or Polygon, in gwei plus the cost of

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x1831f336585a6C67B6A954d28f3E07F44C4EEBbd",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "maxTimeoutSeconds": 120
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "chain": "One or more of ethereum, base, arbitrum, optimism, polygon (comma-separated)."
        },
        "type": "http"
      },
      "output": {
        "example": {
          "chains": [
            {
              "chain": "base",
              "chainId": 8453,
              "gasPriceGwei": 0.006,
              "gasPriceWei": "6000000",
              "name": "Base"
            }
          ],
          "checkedAt": "2026-08-24T11:09:17.183Z",
          "note": "Gas moves every block; treat this as ..."
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://onchain-toolkit.bowling-anthony.workers.dev/gas"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://onchain-toolkit.bowling-anthony.workers.dev/gas");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

import httpx
res = httpx.get("https://onchain-toolkit.bowling-anthony.workers.dev/gas")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header