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x402 AgentUtility Gas Price API
x402
x402 AgentUtility Gas Price API is a paid API for AI agents from x402.agentutility.ai, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-19).
Estimates EIP-1559 gas fees for Base, Ethereum, Optimism, and Arbitrum chains, returning tiered priority fees, maxFeePerGas, and USD cost estimates for common transaction types.
Price / call$0.02
Success—
StatusUnknown
How this service works
Gas price API / EIP-1559 fee estimator / Base + Ethereum + Optimism + Arbitrum gas tracker / pre-tx cost estimator. Reads the chain's latest block, derives base fee, suggests priority fees for safe-low/standard/fast tiers, computes total maxFeePerGas, and converts cost to USD for common tx types.
Output
Returns the latest block's base fee, suggested priority fees for safe-low, standard, and fast confirmation tiers, the computed maxFeePerGas for each tier, and USD cost estimates for common transaction types (e.g. ETH transfer, ERC-20 transfer, contract call) on the requested EVM-compatible chain.
Example use cases
Pre-transaction cost check on Base
“Before I send this USDC transfer on Base, tell me the current gas price and how much it'll cost in USD at the standard and fast confirmation speeds.”
Multi-chain gas comparison for DeFi bot
“I'm about to execute a swap — what are the current gas fees on Ethereum, Arbitrum, and Optimism right now? Give me the EIP-1559 base fee and USD cost estimates so I can pick the cheapest chain.”
Gas spike monitoring for wallet app
“Check the current gas prices on Ethereum and let me know the base fee and the fast-tier maxFeePerGas — I want to know if it's a good time to send my transaction or if I should wait.”
Technical details
Endpoint
POSThttps://x402.agentutility.ai/gas-price?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an agent needs real-time, tiered EIP-1559 gas estimates with USD conversion across multiple EVM chains (Base, Ethereum, Optimism, Arbitrum) in a single call, especially when cost-in-dollars is required for user-facing display or pre-transaction decision-making. Prefer this over on-chain RPC calls when the agent lacks direct blockchain access or needs normalized, human-readable fee tiers without parsing raw block data.
Side effects
- Unsupported chain identifier returns an error or empty response
- RPC node unavailability causes stale or missing block data
- Extreme gas price volatility may make estimates outdated within seconds
- Missing or malformed request body returns a 400 error
- Payment failure via x402 protocol results in 402 response and no data returned
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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