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Synapse API — Blockchain Gas Estimation
x402
Synapse API — Blockchain Gas Estimation 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 2026-09-13).
Estimates the gas cost for a transaction on a 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 (and potentially estimated fee in native currency) required to execute the described transaction, allowing the caller to budget fees before submitting the transaction on-chain.
Example use cases
Pre-flight cost check before token transfer
“Before I send 500 USDC to 0xRecipient...789, can you estimate how much gas that transfer will cost so I know if I have enough ETH to cover fees?”
Smart contract interaction cost estimate
“I want to call a smart contract at 0xContract...456 with this calldata: 0xa9059cbb000... — can you estimate the gas required so I can budget the transaction?”
Wallet fee display for DApp
“Given a transaction from my wallet 0xMyWallet...111 to 0xDApp...222 with value 0 and calldata 0x12345678, what's the estimated gas cost before I confirm?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/adi/gas/estimateWhen to prefer
Use this endpoint when you need a quick, pay-per-call gas estimate for a blockchain transaction without setting up your own RPC node or provider credentials. Particularly useful for agents that need to budget transaction costs across multiple chains before committing to a send.
Side effects
- Invalid or malformed address in 'to' or 'from' fields returns an error
- Malformed hex in 'data' field causes parse error
- Network or RPC unavailability may cause timeout or 503
- Missing required fields may return 400 bad request
- Estimate may be inaccurate if blockchain state changes between estimate and actual submission
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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