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Phantom API — Gas Estimation for On-Chain Transactions
x402
Phantom API — Gas Estimation for On-Chain 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 Ethereum-compatible transaction given sender, recipient, calldata, and value fields across 57+ blockchain networks.
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) for the described transaction, allowing the caller to anticipate transaction costs and configure gas limits before submitting to a blockchain network.
Example use cases
Pre-flight gas check for token transfer
“Before I send 500 USDC to 0x1234abcd... from my wallet 0x9876fedc..., can you estimate how much gas that transaction will consume?”
Smart contract interaction cost preview
“I want to call a smart contract at 0xDeAdBeEf... with calldata 0x38ed1739... and no ETH value — estimate the gas cost for me so I can decide if it's worth it.”
DeFi trade simulation before execution
“Simulate the gas usage for a Uniswap swap where my wallet 0xAaBbCc... is the sender, the router is 0x7a250d... and the calldata is 0x18cbafe5... with 0.5 ETH as the value.”
Technical details
Endpoint
POSThttps://phantom-api-omega.vercel.app/api/plasma/gas/estimate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, pay-per-call gas estimation across a wide range of EVM-compatible chains without managing your own node infrastructure. Ideal for agents that need to simulate transaction costs before execution, especially when multi-chain support (57+ networks) is needed without a long-term subscription.
Side effects
- Invalid or malformed address in 'to' or 'from' fields returns an error
- Malformed calldata in 'data' field causes simulation failure
- Unsupported network or chain context results in an error response
- Payment not received or insufficient USDC results in 402 rejection
- Contract at target address reverts during simulation, causing estimation failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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