Utilities · x402 · active demand

Base gas oracle / gas price API for AI agents and bots — get the gas price for a transa…

by gas.apitoll.cloud · discovered, not yet claimed by its owner · updated 2026-10-13

30d calls15

30d payers15

MethodGET

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Base gas oracle / gas price API for AI agents and bots — get the gas price for a transaction on Base in one x402 call. Real-time slow/standard/fast EIP-1559 fee tiers from a live eth_feeHistory call, returned as DROP-IN maxFeePerGas + maxPriorityFeePerGas in wei — plug straight into a viem/ethers transaction, no gwei conversion. Plus base fee, head block, and network fullness. Call it before every Base tx to set a fair fee or wait out congestion.

Tags: base · gas · gas-oracle · gas-price · transaction-fees · bazaar

Call contract

Method: GET
Input: query parameters
Output: json
Last paid call: 2026-10-13

Input example from Bazaar metadata

{
  "blocks": 20
}

Output example

{
  "base_fee_gwei": 0.0042,
  "base_fee_wei": "4200000",
  "block_number": 16842103,
  "network": "base-mainnet",
  "stats": {
    "blocks_sampled": 20,
    "median_fullness_pct": 31.5,
    "ts": "2026-05-28T15:42:30.000Z"
  },
  "tiers": {
    "fast": {
      "maxFeePerGas": "16300000",
      "maxPriorityFeePerGas": "10000000",
      "max_fee_gwei": 0.0163,
      "max_priority_gwei": 0.01
    },
    "slow": {
      "maxFeePerGas": "8300000",
      "maxPriorityFeePerGas": "2000000",
      "max_fee_gwei": 0.0083,
      "max_priority_gwei": 0.002
    },
    "standard": {
      "maxFeePerGas": "10300000",
      "maxPriorityFeePerGas": "4000000",
      "max_fee_gwei": 0.0103,
      "max_priority_gwei": 0.004
    }
  }
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/26535.json for the price and payment options.
Pay. Call GET https://gas.apitoll.cloud/v1/base/gas. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.001 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 15 calls · 15 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.001	0xcc69d619E6053F88A4845066518f465bD06Fc96c	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xcc69d619E6053F88A4845066518f465bD06Fc96c",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "base_fee_gwei": {
          "description": "EIP-1559 base fee for the next block (gwei, human-readable).",
          "type": "number"
        },
        "base_fee_wei": {
          "description": "Base fee in wei (exact, BigInt-ready decimal string).",
          "type": "string"
        },
        "block_number": {
          "description": "Latest sampled block number (the head).",
          "type": "integer"
        },
        "network": {
          "description": "Network identifier (Base mainnet or testnet)",
          "enum": [
            "base-mainnet",
            "base-sepolia"
          ],
          "type": "string"
        },
        "stats": {
          "description": "Sampling metadata: block count and median fullness.",
          "properties": {
            "blocks_sampled": {
              "description": "Number of recent blocks sampled for percentile calculation.",
              "type": "integer"
            },
            "median_fullness_pct": {
              "description": "Median (gasUsed / gasLimit) × 100 across sampled blocks. 100 = full, 0 = empty.",
              "type": "number"
            },
            "ts": {
              "description": "ISO 8601 timestamp when snapshot was assembled.",
              "format": "date-time",
              "type": "string"
            }
          },
          "required": [
            "blocks_sampled",
            "median_fullness_pct",
            "ts"
          ],
          "type": "object"
        },
        "tiers": {
          "description": "Three fee tiers (slow p10, standard p50, fast p90). Each carries human gwei (max_fee_gwei/max_priority_gwei) AND DROP-IN wei (maxFeePerGas/maxPriorityFeePerGas, BigInt-ready) to plug straight into a viem/ethers tx.",
          "properties": {
            "fast": {
              "properties": {
                "maxFeePerGas": {
                  "description": "DROP-IN: exact maxFeePerGas in wei. tx.maxFeePerGas = BigInt(this).",
                  "type": "string"
                },
                "maxPriorityFeePerGas": {
                  "description": "DROP-IN: exact maxPriorityFeePerGas in wei (BigInt-ready).",
                  "type": "string"
                },
                "max_fee_gwei": {
                  "description": "maxFeePerGas in gwei (human-readable).",
                  "type": "number"
                },
                "max_priority_gwei": {
                  "description": "maxPriorityFeePerGas (tip) in gwei (human-readable).",
                  "type": "number"
                }
              },
              "required": [
                "max_fee_gwei",
                "max_priority_gwei",
                "maxFeePerGas",
                "maxPriorityFeePerGas"
              ],
              "type": "object"
            },
            "slow": {
              "properties": {
                "maxFeePerGas": {
                  "description": "DROP-IN: exact maxFeePerGas in wei. tx.maxFeePerGas = BigInt(this).",
                  "type": "string"
                },
                "maxPriorityFeePerGas": {
                  "description": "DROP-IN: exact maxPriorityFeePerGas in wei (BigInt-ready).",
                  "type": "string"
                },
                "max_fee_gwei": {
                  "description": "maxFeePerGas in gwei (human-readable).",
                  "type": "number"
                },
                "max_priority_gwei": {
                  "description": "maxPriorityFeePerGas (tip) in gwei (human-readable).",
                  "type": "number"
                }
              },
              "required": [
                "max_fee_gwei",
                "max_priority_gwei",
                "maxFeePerGas",
                "maxPriorityFeePerGas"
              ],
              "type": "object"
            },
            "standard": {
              "properties": {
                "maxFeePerGas": {
                  "description": "DROP-IN: exact maxFeePerGas in wei. tx.maxFeePerGas = BigInt(this).",
                  "type": "string"
                },
                "maxPriorityFeePerGas": {
                  "description": "DROP-IN: exact maxPriorityFeePerGas in wei (BigInt-ready).",
                  "type": "string"
                },
                "max_fee_gwei": {
                  "description": "maxFeePerGas in gwei (human-readable).",
                  "type": "number"
                },
                "max_priority_gwei": {
                  "description": "maxPriorityFeePerGas (tip) in gwei (human-readable).",
                  "type": "number"
                }
              },
              "required": [
                "max_fee_gwei",
                "max_priority_gwei",
                "maxFeePerGas",
                "maxPriorityFeePerGas"
              ],
              "type": "object"
            }
          },
          "type": "object"
        }
      },
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "base_fee_gwei": 0,
    "base_fee_wei": "string",
    "block_number": 0,
    "network": "base-mainnet",
    "stats": {
      "blocks_sampled": 0,
      "median_fullness_pct": 0,
      "ts": "2026-01-01T00:00:00Z"
    },
    "tiers": {
      "fast": {
        "maxFeePerGas": "string",
        "maxPriorityFeePerGas": "string",
        "max_fee_gwei": 0,
        "max_priority_gwei": 0
      },
      "slow": {
        "maxFeePerGas": "string",
        "maxPriorityFeePerGas": "string",
        "max_fee_gwei": 0,
        "max_priority_gwei": 0
      },
      "standard": {
        "maxFeePerGas": "string",
        "maxPriorityFeePerGas": "string",
        "max_fee_gwei": 0,
        "max_priority_gwei": 0
      }
    }
  },
  "type": "string"
}

Examples

curl

curl "https://gas.apitoll.cloud/v1/base/gas"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://gas.apitoll.cloud/v1/base/gas");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://gas.apitoll.cloud/v1/base/gas")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: gas.apitoll.cloud
Endpoint: https://gas.apitoll.cloud/v1/base/gas
Machine-readable: /resources/26535.json