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Phantom API — Gas Estimation for EVM Transactions
x402
Phantom API — Gas Estimation for EVM Transactions 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 2026-10-20).
Estimates the gas cost for an EVM-compatible smart contract call or transfer before submitting it on-chain
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 an estimated gas amount (in gas units) required to execute the specified transaction, allowing the caller to budget fees and detect potential out-of-gas failures before submission.
Example use cases
Pre-flight check for DeFi swap
“I want to call a Uniswap swap function on Ethereum. Can you estimate the gas for a transaction from 0xMyWallet to 0xUniswapRouter with this calldata: 0x38ed1739... before I actually submit it?”
Token transfer gas estimate
“How much gas will it cost to transfer 100 USDC? The sender is 0xSender123, recipient is 0xRecipient456, and the ERC-20 transfer calldata is 0xa9059cbb...”
Smart contract deployment cost check
“Before I deploy this contract, estimate how much gas it'll take — from address 0xDeployer to null, with this bytecode as the data field, and zero ETH value.”
Technical details
Endpoint
POSThttps://phantom-api-omega.vercel.app/api/degen/gas/estimate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-call gas estimate for EVM transactions across 57+ networks without managing your own RPC node infrastructure. Prefer it over running your own eth_estimateGas RPC call when you want a hosted, low-latency solution with simple HTTP semantics and micro-payment billing.
Side effects
- Invalid or malformed Ethereum address in 'to' or 'from' fields — returns error
- Invalid hex calldata in 'data' field — returns parsing error
- Transaction would revert on-chain — gas estimation may fail with revert reason
- Network or RPC connectivity issues — returns 5xx error
- Missing required fields — returns 400 validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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