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Phantom API — Ethereum Gas Estimate
x402
Phantom API — Ethereum Gas Estimate is a paid API for AI agents from phantom-api-omega.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Estimates the gas required to execute an Ethereum transaction given sender, recipient, calldata, and value
Price / call$0.01
Success—
StatusUnknown
How this service works
Lightning-fast access to blockchain data, smart contract insights, and Web3 infrastructure across 57+ networks. Pay-per-call via x402.
Output
Returns a gas estimate (in units) representing the computational cost of executing the specified Ethereum transaction, useful for setting gas limits and estimating transaction fees before submission.
Example use cases
Pre-flight check for DeFi swap
“I'm about to call the Uniswap V3 swap router from 0xMyWallet to 0xUniswapRouter with this calldata 0xabc123... and 0 ETH value — estimate the gas before I submit so I know it won't fail.”
NFT mint gas budgeting
“How much gas will minting an NFT on this contract cost? Sender is 0xMinter, contract is 0xNFTContract, calldata is 0x1249c58b, and I'm sending 0.08 ETH with it.”
Validate contract call won't revert
“Can you do a gas estimate for a transaction from 0xDeployer to 0xMyContract with calldata 0xd0e30db0 and no ETH value? I want to confirm it won't run out of gas before I broadcast it.”
Technical details
Endpoint
POSThttps://phantom-api-omega.vercel.app/api/ethereum/gas/estimateWhen to prefer
Use this endpoint when you need a fast, pay-per-call Ethereum gas estimate without managing your own RPC node or committing to a subscription. Ideal for agents that need to preflight transactions across many users or contracts on-demand. Prefer this over self-hosted solutions when minimizing infrastructure overhead and you only need occasional gas checks at $0.01 per call.
Side effects
- Invalid or malformed Ethereum address for 'to' or 'from' returns an error
- Reverting transaction (would fail on-chain) may return an error or revert reason instead of a gas estimate
- Malformed or invalid calldata hex string causes a bad request error
- Missing required fields may result in a default simulation with limited accuracy
- Payment failure via x402 protocol blocks the request before execution
- Network congestion or RPC backend unavailability causes timeout or 503
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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