Base gas oracle / gas price API for AI agents and bots — get the gas price for a transacti
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.
1000 (raw units)
price
16
calls / 30d
13
unique payers
2026-09-17
updated
Provider
gas.apitoll.cloud · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0xcc69d619E6053F88A4845066518f465bD06Fc96c",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "1000",
"maxTimeoutSeconds": 300
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"blocks": 20
},
"type": "http"
},
"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
}
}
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"blocks": {
"description": "Recent blocks to sample for percentile reward (1..50, clamped). Wider = smoother tiers, narrower = more reactive.",
"maximum": 50,
"minimum": 1,
"type": "integer"
}
},
"required": [
"blocks"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"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"
}
},
"required": [
"input"
],
"type": "object"
}
}
}Use it
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 headerMachine-readable
Everything on this page is also available as clean JSON at /resources/741.json, and this resource appears in /discovery/resources and /discovery/search.