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Avasis EVM Gas Ops — Ethereum + Base Gas Fee Oracle
x402
Avasis EVM Gas Ops — Ethereum + Base Gas Fee Oracle is a paid API for AI agents from agents.avasis.ai, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-31).
Returns a unified gas fee kit for Ethereum and Base in one call: EIP-1559 fee tiers, USD cost estimates for common transactions, next-block base fee forecast, congestion level, and a recommended chain/tier pick.
Price / call$0.05
Success—
StatusUnknown
How this service works
Ethereum gas + Base gas in one call (evm gas ops, $0.05) for agents that send transactions. Per chain: base fee, priority fee, four EIP-1559 fee tiers (slow/standard/fast/urgent: maxFeePerGas + maxPriorityFeePerGas), next-block base-fee estimate + congestion, ETH + USD cost of a transfer / ERC-20 transfer / approve / swap and of your gas_limit (Chainlink ETH/USD), Base-vs-Ethereum comparison, a pick with its reason. Free live sample /v1/evm/gas-ops/sample. Upstream down 503, never charged.
Output
A JSON object containing per-chain data for both Ethereum and Base: current base fee, priority fee, four EIP-1559 tiers (slow/standard/fast/urgent) each with maxFeePerGas and maxPriorityFeePerGas, next-block base fee estimate, congestion level, USD and ETH costs for ETH transfer / ERC-20 transfer / approve / swap and for the caller's custom gas_limit, a Base-vs-Ethereum comparison, a recommended chain+tier with a stated reason, current ETH/USD price from Chainlink, and a headline summary string.
Example use cases
Pre-trade gas cost check for a DeFi swap
“Before I execute this swap on Ethereum, tell me how much gas I'll pay at the fast tier for a swap transaction — use a gas limit of 180000 — and whether I'd save money doing it on Base instead.”
Wallet app showing live gas to users
“Fetch the current Ethereum and Base gas fees for all four speed tiers and give me the ETH and USD cost of a standard ERC-20 transfer right now so I can display it to my users.”
Autonomous agent deciding when and where to transact
“Check current network congestion and gas prices on both Ethereum and Base, then tell me which chain and which fee tier you'd recommend for my next transaction and why.”
Technical details
Endpoint
GEThttps://agents.avasis.ai/v1/evm/gas-ops?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an agent needs a comprehensive, multi-chain EVM gas snapshot in a single call rather than querying separate RPC endpoints or gas APIs. It is especially useful when the agent must decide between Base and Ethereum mainnet for cost efficiency, needs USD-denominated cost estimates for specific transaction types, or needs all EIP-1559 tiers at once. At $0.05 per call it is cost-effective for autonomous agents executing or preparing transactions.
Side effects
- 503 returned when upstream (node provider) is unavailable — caller is never charged in this case
- Invalid gas_limit outside allowed range (21000–30000000) results in a validation error
- Network timeouts if underlying EVM RPC nodes are slow or degraded
- Missing or stale Chainlink ETH/USD price may affect USD cost accuracy
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"kit": "evm-gas-ops-1",
"base": {
"seq": 2411,
"gwei": {
"baseFee": 0.0021,
"gasPrice": 0.0031,
"maxPriorityFee": 0.001,
"suggestedMaxFee": 0.0052
},
"pick": {
"tier": "standard"
},
"ageMs": 380,
"block": {
"number": 37400000,
"timestamp": 1761739199,
"ageSeconds": 1,
"gasUsedPct": 14.2
},
"chain": "base",
"costs": {
"ops": [
{
"op": "eth_transfer",
"gas": 21000,
"expected": {
"eth": 6.51e-8,
"usd": 0.000167991
}
}
],
"note": "(+ erc20_transfer, erc20_approve, dex_swap, max_authorized, wei in the paid body)",
"your_tx": {
"gas": 21000,
"expected": {
"eth": 6.51e-8,
"usd": 0.000167991
}
},
"per_gas_now": {
"gwei": 0.0031
}
},
"stale": false,
"tiers": [
{
"tier": "slow",
"maxFeePerGas": {
"gwei": 0.002863
},
"maxPriorityFeePerGas": {
"gwei": 0.0005
}
},
{
"tier": "standard",
"maxFeePerGas": {
"gwei": 0.0052
},
"maxPriorityFeePerGas": {
"gwei": 0.001
}
},
{
"tier": "fast",
"maxFeePerGas": {
"gwei": 0.0057
},
"maxPriorityFeePerGas": {
"gwei": 0.0015
}
},
{
"tier": "urgent",
"maxFeePerGas": {
"gwei": 0.0083
},
"maxPriorityFeePerGas": {
"gwei": 0.002
}
}
],
"chainId": 8453,
"priority": {
"gwei": 0.001,
"basis": "node eth_maxPriorityFeePerGas"
},
"available": true,
"next_block": {
"label": "balanced",
"eip1559": {
"elasticity": 6,
"denominator": 250,
"max_change_pct": 0.4
},
"vs_target": 0.852,
"change_pct": -0.0592,
"base_fee_direction": "falling",
"next_base_fee_estimate": {
"gwei": 0.002099
}
},
"observedAt": "2026-10-29T12:00:00.000Z"
},
"solana": {
"slot": {
"available": true,
"slotProcessed": 462900001
},
"sol_usd": {
"price": 100.08,
"available": true
},
"priority_fee": {
"available": true,
"suggested": {
"low": 1000,
"high": 50000,
"medium": 10000,
"veryHigh": 200000
}
}
},
"compare": {
"cheaper": "base",
"gas_limit": 21000,
"ethereum_over_base": 454.8
},
"eth_usd": {
"price": 2580.5,
"source": "chainlink ETH/USD aggregator on Base (latestRoundData)",
"available": true
},
"sources": [
"publicnode ethereum rpc (via stream hub)",
"publicnode base rpc (via stream hub)",
"chainlink ETH/USD (Base feed)",
"publicnode solana rpc (via stream hub)"
],
"also_try": [
{
"url": "https://agents.avasis.ai/v1/base/tx-precheck",
"what": "Base tx precheck: simulate YOUR unsigned transaction before you sign (would it revert + reason, gas in USD, every transfer, approval exposure, counterparty risk): SIGN / CAUTION / BLOCK",
"price_usd": "0.02",
"free_sample": "https://agents.avasis.ai/v1/evm/tx-precheck/sample"
},
{
"url": "https://agents.avasis.ai/v1/base/multi-balance",
"what": "Base wallet multi-balance: ETH + USDC + up to 20 ERC-20s in one call, USD totals, and can this wallet pay the gas you just priced",
"price_usd": "0.02",
"free_sample": "https://agents.avasis.ai/v1/evm/multi-balance/sample"
}
],
"ethereum": {
"seq": 812,
"gwei": {
"baseFee": 0.41,
"gasPrice": 1.41,
"maxPriorityFee": 1,
"suggestedMaxFee": 1.82
},
"pick": {
"tier": "standard"
},
"ageMs": 420,
"block": {
"number": 23700000,
"timestamp": 1761739195,
"ageSeconds": 5,
"gasUsedPct": 46.3
},
"chain": "ethereum",
"costs": {
"ops": [
{
"op": "eth_transfer",
"gas": 21000,
"expected": {
"eth": 0.00002961,
"usd": 0.0764086
}
}
],
"note": "(+ erc20_transfer, erc20_approve, dex_swap, max_authorized, wei in the paid body)",
"your_tx": {
"gas": 21000,
"expected": {
"eth": 0.00002961,
"usd": 0.0764086
}
},
"per_gas_now": {
"gwei": 1.41
}
},
"stale": false,
"tiers": [
{
"tier": "slow",
"maxFeePerGas": {
"gwei": 0.96125
},
"maxPriorityFeePerGas": {
"gwei": 0.5
}
},
{
"tier": "standard",
"maxFeePerGas": {
"gwei": 1.82
},
"maxPriorityFeePerGas": {
"gwei": 1
}
},
{
"tier": "fast",
"maxFeePerGas": {
"gwei": 2.32
},
"maxPriorityFeePerGas": {
"gwei": 1.5
}
},
{
"tier": "urgent",
"maxFeePerGas": {
"gwei": 3.23
},
"maxPriorityFeePerGas": {
"gwei": 2
}
}
],
"chainId": 1,
"priority": {
"gwei": 1,
"basis": "node eth_maxPriorityFeePerGas"
},
"available": true,
"next_block": {
"label": "balanced",
"eip1559": {
"elasticity": 2,
"denominator": 8,
"max_change_pct": 12.5
},
"vs_target": 0.926,
"change_pct": -0.925,
"base_fee_direction": "falling",
"next_base_fee_estimate": {
"gwei": 0.406208
}
},
"observedAt": "2026-10-29T12:00:00.000Z"
},
"headline": "Ethereum base fee 0.41 gwei, balanced (falling), transfer ~$0.076 · Base 0.0021 gwei, transfer ~$0.00017 · ETH $2580.5 · Base 455x cheaper for 21000 gas right now",
"gas_limit": 21000,
"computedAt": "2026-10-29T12:00:00.500Z",
"how_to_use": [
"Type-2 (EIP-1559) transaction: set maxFeePerGas and maxPriorityFeePerGas from the tier you choose (tiers[]); pick.tier is our deterministic suggestion with its reason."
]
}
}Tags
x402
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