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EVM Gas Estimator — Estimate Gas Usage and Cost
x402
EVM Gas Estimator — Estimate Gas Usage and Cost is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-13).
Estimates how much gas a transaction will consume and its cost at the current gas price across 12 EVM chains, returning the revert reason if the transaction would fail.
Price / call$0.003
Success—
StatusUnknown
How this service works
Estimate the gas a transaction will use (eth_estimateGas) and its cost at the current gas price, or the revert reason if it would fail. Nothing is sent. Works on Base, Ethereum, Arbitrum, Optimism, Polygon, BNB Chain, Avalanche, Gnosis, Linea, Scroll, Sonic and Unichain.
Output
Returns a JSON object with: whether the transaction is executable (true/false), estimated gas units, recommended gas units (with buffer), current gas price in gwei, estimated cost in the chain's native token, the chain name, and the native token symbol. If the transaction would revert, the revert reason is returned instead.
Example use cases
Pre-flight DeFi swap cost check
“I want to swap tokens on Arbitrum but before I do anything, can you estimate the gas cost for calling this contract — from 0xSenderAddr to 0xUniswapRouter with this calldata 0xa9059cbb... — so I know if it's worth doing right now?”
Detect reverting transaction before sending
“I'm about to submit a transaction from 0xMyWallet to 0xContractAddr on Polygon, but I'm worried it might fail — can you simulate it and tell me if it would revert and why?”
Cross-chain gas cost comparison
“Can you estimate the gas cost for the same transaction — from 0xSender to 0xRecipient with calldata 0xabcdef — on both Optimism and Ethereum so I can compare which is cheaper right now?”
Technical details
Endpoint
POSThttps://api.vextorium.com/evm-estimar-gas-pago?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to pre-flight check a transaction before submitting it, verify it won't revert, or calculate expected gas costs across 12 supported EVM chains without any risk of sending anything on-chain. Prefer this over live gas price endpoints when you also need per-transaction simulation rather than just current network gas prices.
Side effects
- Invalid sender or recipient address returns an error
- Transaction would revert — response includes revert reason instead of gas estimate
- Unsupported chain specified returns a validation error
- Missing required fields (de or a) returns a schema validation error
- Network congestion or RPC unavailability may cause timeouts
- Malformed calldata (datos field) causes simulation failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| a | string | |
| de | string | |
| red | string | Chain (default base) |
| datos | string | |
| valor | number |
Output
Schema · Response
{
"type": "json",
"example": {
"red": "base",
"nativo": "ETH",
"ejecutable": true,
"gas_estimado": 30989,
"coste_estimado": 1.859e-7,
"gas_recomendado": 37186,
"precio_gas_gwei": 0.006
}
}Tags
x402
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