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Base Mainnet Gas Estimator
x402
Base Mainnet Gas Estimator is a paid API for AI agents from x402.agentindex.world, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-30).
Estimates gas required for a transaction or contract call on Base mainnet using eth_estimateGas, without broadcasting the transaction.
Price / call$0.004
Success—
StatusUnknown
How this service works
Gas estimate for a Base mainnet swap or any other call (to/from/value/data) via eth_estimateGas, without broadcasting a transaction.
Output
Returns the estimated number of gas units required to execute the specified transaction or call on Base mainnet, computed via eth_estimateGas without actually broadcasting the transaction. This lets agents budget for gas costs, detect likely reverts, and validate transaction feasibility before committing on-chain.
Example use cases
Pre-flight check for DeFi swap
“Before I submit this Uniswap swap on Base, estimate the gas for a call to 0x3fC91A3afd70395Cd496C647d5a6CC9D4B2b7FAD with the swap calldata 0x3593564c000... from my wallet 0xAbC123... sending 0 wei, so I know if it's worth proceeding.”
Validate contract deployment cost
“Can you estimate how much gas it'll cost to deploy this contract on Base mainnet? The to address is 0x0000000000000000000000000000000000000000, my deployer is 0xDEF456..., value is 0 wei, and here's the bytecode as calldata: 0x6080604052...”
Check ETH transfer gas on Base
“How much gas would a plain ETH transfer of 500000000000000000 wei from 0xSender... to 0xRecipient... cost on Base mainnet? No calldata needed.”
Technical details
Endpoint
GEThttps://x402.agentindex.world/base/estimate-gas?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a gas estimate specifically for Base mainnet (Coinbase's L2) before submitting a transaction. Prefer this over generic Ethereum gas estimators when you're operating on Base. Ideal for pre-flight checks in DeFi agents, smart contract deployment pipelines, or any workflow where you want to validate feasibility and budget gas costs without risking a failed on-chain transaction.
Side effects
- Transaction would revert on-chain — eth_estimateGas returns an error if the simulated call would fail (e.g. insufficient token balance, access control rejection)
- Invalid address format for 'to' or 'from_address' — returns a validation or RPC error
- Malformed calldata — may cause revert simulation or RPC error
- Network congestion or RPC node unavailability — request may time out or return an error
- Missing required 'to' field — returns a 422 or bad request error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | — | |
| value_wei | integer | |
| from_address | — |
Tags
x402
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