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Synapse API — Unichain Gas Estimator
x402
Synapse API — Unichain 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 Unichain 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 a gas estimate (likely in gas units) for the described transaction on Unichain, allowing callers to budget fees or validate feasibility before broadcasting the actual transaction.
Example use cases
Pre-flight gas check for token transfer
“Before I send this ERC-20 transfer on Unichain, estimate the gas — from 0xSender123 to 0xRecipient456, calldata is 0xa9059cbb... and value is 0.”
Smart contract deployment cost estimate
“Can you estimate how much gas deploying my contract will use on Unichain? From address 0xDeploy789, no recipient needed, and the bytecode is 0x608060...”
DeFi swap gas sanity check
“I want to know the gas cost for this Unichain DEX swap before I submit it — from 0xMyWallet to 0xRouterContract, calldata is 0x38ed1739..., value is 1000000000000000000.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/unichain/gas/estimateWhen to prefer
Choose this endpoint when you need a quick, pay-per-call gas estimate specifically on the Unichain network without setting up your own RPC node or managing API keys beyond x402 USDC micropayments. Ideal for agents that need to pre-check transaction feasibility or cost on Unichain before committing funds.
Side effects
- Invalid or malformed Ethereum address for 'to' or 'from' fields returns an error
- Invalid calldata hex string causes parsing failure
- Network unavailability or Unichain node issues may return a timeout or 5xx error
- Payment failure via x402 protocol results in 402 Payment Required
- Transactions that would revert on-chain may return an error or revert reason rather than a gas estimate
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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