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Phantom API — StarkNet Gas Estimate
x402
Phantom API — StarkNet Gas Estimate 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 2026-10-18).
Estimates gas fees for a transaction on the StarkNet 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 an estimated gas fee (in StarkNet native units) for the specified transaction parameters, allowing the caller to assess cost before actually broadcasting the transaction to the network.
Example use cases
Pre-flight gas check for StarkNet DeFi swap
“Before I execute this StarkNet swap to contract 0x04270219...dead calling entrypoint data 0x00swap00 from my wallet 0xMyWallet...beef, can you estimate how much gas it will cost so I can decide if it's worth it right now?”
Budget gas fees for a StarkNet NFT mint
“I want to mint an NFT on StarkNet — the contract is 0xNFTContract...cafe, my address is 0xMyAddress...1337, data is 0x00mint, value is 0. What's the estimated gas fee so I can make sure I have enough funds?”
Compare gas cost across multiple StarkNet calls
“Estimate the gas for this StarkNet transaction: from 0xSender...aaaa, to 0xReceiver...bbbb, data is 0x00transfer, value is 100. I want to see the fee before deciding whether to batch it or send it alone.”
Technical details
Endpoint
POSThttps://phantom-api-omega.vercel.app/api/starknet/gas/estimate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, pay-per-call gas estimate for a StarkNet transaction without running your own node. Ideal for agents that need to preflight transaction costs before committing, or for comparing fees across different contract interactions on StarkNet specifically.
Side effects
- Invalid or malformed 'to' address returns an error
- Invalid calldata format causes a simulation failure
- Unreachable StarkNet node results in a timeout or 503
- Missing required fields returns a 400 bad request
- Estimated gas may differ from actual gas if network conditions change between estimate and submission
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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