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AgentUtility Gas API — EIP-1559 Fee Estimator
x402
AgentUtility Gas API — EIP-1559 Fee Estimator is a paid API for AI agents from x402.agentutility.ai, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Returns real-time EIP-1559 gas fee tiers (safe-low, standard, fast) plus USD transaction cost estimates for Base, Ethereum, Optimism, and Arbitrum
Price / call$0.02
Success—
StatusUnknown
How this service works
Gas API / blockchain gas fee estimator / EIP-1559 fee tiers. Returns base fee, safe-low, standard, and fast priority/max fees, plus USD tx-cost estimates for Base, Ethereum, Optimism, and Arbitrum.
Output
Returns the current EIP-1559 gas parameters for the requested network(s): base fee, safe-low / standard / fast priority fees (tip), max fee per gas values, and estimated USD transaction costs for a standard transfer — allowing agents or users to choose an appropriate fee tier before submitting a transaction.
Example use cases
Time a DeFi swap on Ethereum
“Check the current gas fees on Ethereum and tell me whether now is a good time to submit my swap — show me the safe-low, standard, and fast fee tiers and what each would cost in USD.”
Pick cheapest L2 for token transfer
“I need to send tokens and want to spend as little as possible on gas — can you pull the current fee estimates for Base, Optimism, and Arbitrum so I can pick the cheapest chain right now?”
Pre-flight gas check for agent transaction
“Before my agent submits this contract call on Base, get the current EIP-1559 base fee and fast priority fee so I can set an appropriate maxFeePerGas and know the expected USD cost.”
Technical details
Endpoint
POSThttps://x402.agentutility.ai/gas-apiWhen to prefer
Choose this endpoint when an agent needs to programmatically estimate gas costs before submitting any on-chain transaction on Base, Ethereum, Optimism, or Arbitrum — especially when USD cost awareness is needed alongside raw gwei values. Prefer over block-explorer scraping or manual RPC calls when operating in an agentic, MCP-callable context with x402 micropayment settlement.
Side effects
- Unsupported network name returns an error or empty result
- Network RPC unavailability may cause stale or missing fee data
- High blockchain volatility may cause returned fees to be outdated within seconds
- Payment failure (x402 USDC not settled) returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"cost_usd": {
"nft_mint": 0.006,
"transfer": 0.0008,
"uniswap_swap": 0.004,
"erc20_transfer": 0.0012
},
"timestamp": "2026-05-06T22:00:00Z",
"block_number": 27500000,
"base_fee_gwei": 0.005,
"eth_price_usd": 3500,
"priority_fee_gwei": {
"fast": 0.002,
"safe_low": 0.001,
"standard": 0.001
},
"total_recommended_gwei": 0.006
}
}Tags
x402
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