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Synapse API — Metis Gas Estimator
x402
Synapse API — Metis Gas Estimator is a paid API for AI agents from synapse-api-brown.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Estimates gas costs for a transaction on the Metis blockchain network given sender, recipient, calldata, and value
Price / call$0.01
Success—
StatusUnknown
How this service works
High-speed API suite for AI processing, web scraping, and smart data utilities across 57+ blockchain networks. Pay-per-call via x402.
Output
Returns an estimated gas amount (in gas units) required to execute the specified transaction on the Metis network, allowing the caller to budget fees and decide whether to proceed before actually broadcasting the transaction.
Example use cases
Pre-flight DeFi transaction check
“Before I submit this swap on Metis, estimate the gas for a transaction from 0xSender to 0xUniswapRouter with calldata 0x38ed1739... and value 0 — I want to know if it's worth sending.”
Smart contract deployment cost preview
“Can you estimate how much gas it'll take to deploy my contract on Metis? The sender is 0xMyWallet, recipient is the zero address, calldata is my compiled bytecode 0x608060..., and value is 0.”
Token transfer gas budgeting
“I'm about to send some tokens on Metis from 0xWalletA to 0xWalletB using ERC-20 transfer calldata 0xa9059cbb... with value 0 — estimate the gas so I can budget properly.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/metis/gas/estimateWhen to prefer
Choose this endpoint when you need a quick, pay-per-call gas estimate specifically for the Metis (layer 2) network without managing your own RPC infrastructure. Ideal for agents or wallets that need pre-flight cost checks before submitting transactions on Metis, especially when supporting 57+ blockchain networks through the same API suite is a requirement.
Side effects
- Invalid or malformed Ethereum address for 'to' or 'from' fields returns an error
- Invalid hex-encoded calldata in 'data' field causes estimation failure
- Metis RPC node unavailability results in a timeout or service error
- Transactions that would revert on-chain may return an error or unreliable estimate
- Missing required fields may result in a 400 bad request response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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