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EVM Gas Estimation
x402
EVM Gas Estimation is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-29).
Estimates the gas a transaction would consume on a given EVM chain before it is signed or submitted, using the UnyKorn Operator Network.
Price / call$0.003
Success—
StatusUnknown
How this service works
Estimate the gas a transaction would use, before signing it — Genesis402 / UnyKorn Operator Network
Output
Returns a JSON object with ok=true, the estimation type ('evm-estimate-gas'), a receipt object containing a transaction hash, the cost in USD, and a unique receipt ID, plus an ISO 8601 timestamp of when the estimate was generated.
Example use cases
Pre-flight check for DeFi swap
“Before I submit this Uniswap swap on Arbitrum, estimate the gas it'll consume — from address 0xAaAa...1111, calling contract 0xBbBb...2222 with this calldata: 0xa9059cbb000000...”
Budget gas costs for contract deployment
“I'm about to deploy a contract on Ethereum — can you estimate the gas it would take? The sender is 0x1234...abcd, the target is 0x0000...0000, and the deployment bytecode is 0x6080...”
Validate transaction before user approval
“Check how much gas this Polygon transaction would use so I can warn the user before they approve it — from 0xUser...aaaa to 0xContract...bbbb, value is 0, calldata is 0x23b872dd...”
Technical details
Endpoint
POSThttps://twin.unykorn.org/evm-estimate-gas?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to estimate gas for a transaction on a supported EVM chain (Ethereum, Base, Polygon, Arbitrum, Optimism, BSC, Avalanche, Gnosis, Linea, Scroll) before signing or broadcasting it. It is ideal for agents that need to pre-flight transactions for cost budgeting, UX warnings, or revert detection without committing any funds. Prefer it over raw RPC calls when you want a managed, pay-per-call API with receipts and no node infrastructure to manage.
Side effects
- Invalid or malformed Ethereum address in 'to' or 'from' fields returns a validation error
- Unsupported chain name causes rejection — only the enumerated chains are accepted
- Malformed or non-hex calldata in 'data' field triggers a pattern mismatch error
- Transaction that would revert on-chain may return an error or revert reason
- Payment failure via x402 protocol prevents the call from being processed
- Network congestion or RPC errors on the target chain may cause timeouts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "evm-estimate-gas",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.25,
"receipt_id": "g402-<16hex>"
},
"generated_at": "<iso8601>"
}
}Tags
x402
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