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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 2026-09-14).
Estimates the gas required to execute a given Ethereum-compatible transaction before it is submitted 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 units figure for the described transaction, indicating how much computational work the EVM would need to process it. Helps callers set appropriate gas limits before broadcasting a transaction on-chain.
Example use cases
Pre-flight DeFi swap gas check
“Before I execute this Uniswap swap, can you estimate the gas it'll use? Sender is 0x1234...abcd, recipient is the Uniswap V3 router at 0xE592...B3a8, calldata is 0x414bf389..., and value is 0.”
Smart contract deployment cost preview
“I want to know how much gas deploying this smart contract will consume — the from address is 0xDEAD...BEEF, there's no 'to' address since it's a deployment, and here's the bytecode data: 0x6080604052...”
Token transfer gas estimate
“Can you estimate the gas needed to transfer 500 USDC from my wallet 0xAABB...CCDD to 0x9988...7766? The calldata for the ERC-20 transfer is 0xa9059cbb... and value is 0.”
Technical details
Endpoint
POSThttps://phantom-api-omega.vercel.app/api/adi/gas/estimateWhen to prefer
Use this endpoint when you need a fast, pay-per-call gas estimate without managing your own RPC node or signing up for a long-term subscription. Ideal for agents that need pre-flight cost checks before submitting Ethereum-compatible transactions, especially in multi-chain environments where Phantom API's 57+ network coverage matters.
Side effects
- Invalid or malformed Ethereum addresses return an error response
- Malformed or non-hex calldata causes a parsing error
- Reverted simulation — if the transaction would revert on-chain, the estimate may fail or return an error
- Missing required fields may result in a 400-level error
- Network congestion or upstream RPC failures may cause timeouts or 500-level errors
- Payment not included or insufficient USDC results in 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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