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Phantom API — Gas Estimation
x402
Phantom API — Gas Estimation 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, data, 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 an estimated gas amount (in gas units) required to execute the described transaction on an EVM-compatible chain, computed by simulating the transaction without broadcasting it.
Example use cases
Pre-flight gas check for DeFi swap
“Before I submit this DEX swap transaction, estimate the gas cost — from address 0xABC...111 to the Uniswap router at 0xDEF...222 with calldata 0x38ed1739... and value 0.”
Smart contract deployment cost estimation
“How much gas will it cost to deploy my smart contract? The deployer is 0x111...AAA, the to address is empty, and the bytecode data starts with 0x608060405...”
ETH transfer gas estimation
“I want to send 0.5 ETH from my wallet 0xAAA...999 to 0xBBB...888 — can you estimate the gas units needed for that plain ETH transfer?”
Technical details
Endpoint
POSThttps://phantom-api-omega.vercel.app/api/tempo/gas/estimate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-call gas estimate for EVM transactions without managing your own RPC node or Web3 provider. Ideal for agents that need to pre-validate transaction costs before signing or submitting, especially across multiple networks. Prefer this over self-hosted solutions when cost-per-call at $0.01 USDC is acceptable and infrastructure management overhead should be minimized.
Side effects
- Invalid address format for 'to' or 'from' fields returns a validation error
- Malformed or non-hex calldata in 'data' field causes parsing failure
- Unsupported network or unavailable RPC may return a 503 or empty response
- Payment not completed (x402 protocol) returns a 402 Payment Required response
- Simulated transaction that would revert on-chain may return an error or revert reason
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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