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Gas Estimate
x402
Gas Estimate is a paid API for AI agents from bess-x402.onrender.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Estimates gas usage and cost for an EVM transaction (eth_estimateGas) with a 20% safety buffer, and fails clearly if the call would revert.
Price / call$0.002
Success—
StatusUnknown
How this service works
Estimate the gas a transaction will use (eth_estimateGas) and its cost at the current gas price, with a 20% buffer; fails clearly when the call would revert. Use before signing.
Output
Returns the estimated gas units the transaction will consume, the current gas price, the total cost with a 20% buffer applied, and — if the transaction would revert — a clear error with the revert reason rather than a misleading gas figure.
Example use cases
Pre-sign gas check for ETH transfer
“Estimate the gas cost for sending 1 ETH to 0x742d35Cc6634C0532925a3b844Bc454e4438f44e on Ethereum mainnet before I sign anything.”
Contract call revert detection
“I want to call this contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum with calldata 0xa9059cbb000000... — can you estimate the gas and tell me if the call would revert?”
DeFi transaction fee budgeting on Arbitrum
“What's the estimated gas usage and cost in ETH for this swap calldata 0x38ed1739... going to 0x1b02dA8Cb0d097eB8D57A175b88c7D8b47997506 on Arbitrum, with the 20% safety buffer included?”
Technical details
Endpoint
GEThttps://bess-x402.onrender.com/v1/evm/estimate-gas?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, safe gas estimate before signing any EVM transaction — especially when sending ETH, invoking a contract, or passing calldata — across Ethereum, Base, Arbitrum, Optimism, or Polygon. The built-in 20% buffer and revert detection make it superior to raw eth_estimateGas calls for agent workflows that need to avoid failed transactions or out-of-gas errors.
Side effects
- Transaction would revert: endpoint returns a clear revert reason instead of a gas estimate
- Invalid or unsupported chain name: request fails with a validation error
- Malformed calldata or invalid address: returns an error describing the bad input
- Network timeout or RPC node unavailability: returns a service error
- Missing required 'to' parameter: returns a schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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