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x402 Gas Oracle — EIP-1559 Fee Estimator (Base + Ethereum + Optimism + Arbitrum + Polygon)
x402
x402 Gas Oracle — EIP-1559 Fee Estimator (Base + Ethereum + Optimism + Arbitrum + Polygon) 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).
Reads the latest block on a specified EVM chain, derives EIP-1559 base fee, suggests priority fees for safe-low/standard/fast tiers, computes maxFeePerGas, and converts gas costs to USD for common transaction types.
Price / call$0.02
Success—
StatusUnknown
How this service works
Gas oracle / gas price API / EIP-1559 fee estimator / Base + Ethereum + Optimism + Arbitrum + Polygon gas tracker / etherscan-gas alternative / pre-tx cost estimator / USD gas-cost calculator / safe-low + standard + fast tier feed. Reads the chain's latest block, derives the EIP-1559 base fee, suggests priority fees for safe-low / standard / fast tiers, computes the total recommended maxFeePerGas, and converts cost to USD for common tx types (transfer, ERC-20 transfer, Uniswap swap, NFT mint).
Output
Returns the current EIP-1559 base fee from the latest block, suggested priority fees (tip) for safe-low, standard, and fast tiers, the computed maxFeePerGas for each tier, and USD cost estimates for common transaction types including ETH transfer, ERC-20 transfer, Uniswap swap, and NFT mint.
Example use cases
Example prompt
“What are the current gas fees on Base — give me the safe-low, standard, and fast EIP-1559 tiers and tell me how much a Uniswap swap would cost in USD right now?”
Technical details
Endpoint
POSThttps://x402.agentutility.ai/gas-now-baseWhen to prefer
Use this endpoint when you need real-time EIP-1559 gas estimates on Base, Ethereum, Optimism, Arbitrum, or Polygon — especially when you want USD cost breakdowns for specific transaction types like swaps or NFT mints. Prefer this over Etherscan gas tracker when you need multi-chain coverage in a single API call with USD conversion included.
Side effects
- Unsupported chain name returns an error or empty response
- Chain RPC unavailable causes timeout or error
- Stale block data if chain has reorg or is congested
- Missing or invalid chain parameter returns 400-level error
- USD conversion may be stale if price feed is delayed
Input
{
"chain": "base",
"transactionTypes": [
"uniswap_swap",
"token_transfer",
"contract_deployment"
]
}Output
{
"chain": "base",
"rpc_url": "https://mainnet.base.org",
"chain_id": "8453",
"block_number": "47423183",
"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": 1781635713,
"block_age_seconds": 2,
"block_iso_timestamp": "2026-06-16T18:48:33.000Z",
"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",
"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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