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Phantom API — Sei Network Gas Estimator
x402
Phantom API — Sei Network Gas Estimator 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 2026-10-17).
Estimates gas costs for a transaction on the Sei blockchain network before submission
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 gas units) for the described Sei network transaction, allowing the caller to understand expected transaction fees before committing to on-chain execution.
Example use cases
Pre-flight check before token transfer
“I want to send some SEI tokens from 0xAAA...111 to 0xBBB...222 — can you estimate the gas fees before I actually submit the transaction?”
Smart contract call cost estimation
“I'm about to call a smart contract on Sei at address 0xContract...XYZ with this calldata: 0xa9059cbb000... Can you tell me how much gas it's going to use so I can budget accordingly?”
DeFi transaction cost validation
“Before I execute this DeFi swap on Sei — from wallet 0xMyWallet...123 to the DEX contract 0xDEX...456 with value 5000000 and data 0xswapExact... — please estimate the gas so I know if it's worth it at current gas prices.”
Technical details
Endpoint
POSThttps://phantom-api-omega.vercel.app/api/sei/gas/estimate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need gas cost estimates specifically on the Sei network prior to submitting a transaction. It is ideal for pre-flight fee checks, DeFi transaction cost validation, and smart contract interaction budgeting on Sei. Use this over generic gas tools when you need Sei-specific estimation via a pay-per-call model without managing your own RPC infrastructure.
Side effects
- Invalid or malformed Ethereum-style address in 'to' or 'from' fields returns an error
- Invalid hex calldata in 'data' field causes estimation failure
- Transaction that would revert on-chain may return an error or zero estimate
- Network congestion or Sei RPC node unavailability causes timeout
- Missing required fields may result in a 400 Bad Request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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