Base gas oracle / gas price API for AI agents and bots — get the gas price for a
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.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
945 msmedian answer time
$0.001listed price per call
$0.001price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://gas.apitoll.cloud/v1/base/gas
| Category | Market data |
|---|---|
| Provider host | gas.apitoll.cloud |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 19 from 16 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.001 | 945 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"blocks": 20
},
"type": "http"
}
Promised output schema (from the provider)
{
"$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) \u00d7 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-readabl