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AgentUtility Gas Price API
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 2026-09-15).
Returns real-time EIP-1559 gas fee estimates (base fee, priority fees, maxFeePerGas) and USD/ETH transaction cost breakdowns for Base, Ethereum, Optimism, and Arbitrum.
Price / call$0.02
Success—
StatusUnknown
How this service works
Gas price API / EIP-1559 gas fee endpoint / blockchain transaction fee estimator. Same gas-price handler, discoverable for agents estimating base fee, priority fee tiers, maxFeePerGas, and USD transaction costs for Base, Ethereum, Optimism, and Arbitrum.
Output
Returns a JSON object with the current block number, block timestamp, chain ID, native token (ETH), base fee in gwei, legacy gas price in gwei, native token USD price, and per-operation cost estimates (in ETH and USD) for common transaction types: native transfer, USDC transfer, ERC-20 approve, NFT mint, contract deploy, Uniswap v2 swap, and Uniswap v3 swap.
Example use cases
Pre-flight DeFi transaction cost check
“Before I submit this Uniswap v3 swap on Base, can you tell me the current base fee and how much it'll cost in ETH and USD?”
Cross-chain gas fee comparison
“Compare current transaction fees across Base, Optimism, and Arbitrum — I want to see the base fee in gwei and the ETH cost of a native transfer on each.”
Smart contract deployment budgeting
“I'm about to deploy a smart contract on Ethereum — what's the current gas price and how much will the deployment cost in ETH right now?”
Technical details
Endpoint
POSThttps://x402.agentutility.ai/gas-price-apiWhen to prefer
Choose this endpoint when an AI agent needs real-time, EIP-1559-aware gas fee data across multiple EVM chains (Base, Ethereum, Optimism, Arbitrum) with pre-computed per-operation cost estimates in both ETH and USD. It is especially useful when you want structured cost breakdowns for common DeFi operations (swaps, transfers, deploys) without building your own RPC fee logic. It is x402/USDC-native, making it ideal for autonomous agents that already operate on-chain.
Side effects
- RPC node unavailable for requested chain — returns error with chain details
- Unsupported chain specified — returns validation error
- USD price oracle unavailable — usd_cost fields return null
- Stale block data if the upstream node is lagging — block_age_seconds will be elevated
- Payment failure via x402 — 402 response if USDC balance is insufficient
Input
{
"sort": "relevance",
"type": "story",
"limit": 10,
"query": "artificial intelligence"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"chain": "base",
"rpc_url": "https://base.publicnode.com",
"chain_id": "8453",
"_provider": "agentutility.ai",
"_canonical": "https://x402.agentutility.ai/gas-price-api",
"block_number": "48045857",
"native_token": "ETH",
"base_fee_gwei": 0.005,
"cost_estimates": {
"nft_mint": {
"gas": 100000,
"usd_cost": null,
"native_cost": 6e-7
},
"erc20_approve": {
"gas": 50000,
"usd_cost": null,
"native_cost": 3e-7
},
"usdc_transfer": {
"gas": 65000,
"usd_cost": null,
"native_cost": 3.9e-7
},
"contract_deploy": {
"gas": 500000,
"usd_cost": null,
"native_cost": 0.000003
},
"native_transfer": {
"gas": 21000,
"usd_cost": null,
"native_cost": 1.26e-7
},
"uniswap_v2_swap": {
"gas": 120000,
"usd_cost": null,
"native_cost": 7.2e-7
},
"uniswap_v3_swap": {
"gas": 150000,
"usd_cost": null,
"native_cost": 9e-7
}
},
"block_timestamp": 1782881061,
"block_age_seconds": 1,
"block_iso_timestamp": "2026-07-01T04:44:21.000Z",
"legacy_gas_price_gwei": 0.006,
"native_token_price_usd": null,
"total_recommended_gwei": 0.006,
"priority_fee_suggestion_gwei": 0.001
}Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"source": "rpc",
"standard": {
"max_fee_gwei": 0.02
}
}
}Tags
x402
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