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Synapse API — SEI Gas Estimation
x402
Synapse API — SEI 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 2026-10-15).
Estimates gas cost for a transaction on the SEI blockchain network given sender, recipient, data, 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 (typically as a numeric value representing gas units or fee in the SEI network's denomination) for the described transaction, allowing callers to set appropriate gas limits or display fee previews before submission.
Example use cases
Pre-flight fee check before transfer
“Before I send 500 SEI from my wallet 0xSenderAddress to 0xRecipientAddress, can you estimate how much gas it will cost so I don't underpay?”
Smart contract interaction cost preview
“I want to call a SEI smart contract at 0xContractAddress with calldata 0xa9059cbb000...— can you tell me the estimated gas fee so I can budget accordingly?”
DApp gas budgeting for batch planning
“I'm building a dApp on SEI and need to estimate gas for a transaction from 0xDeployerAddress to 0xContractAddress with data 0x60806040 and value 0 — what's the expected gas cost?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/sei/gas/estimate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-call gas estimate specifically for the SEI blockchain network without running your own RPC node. Prefer it over generic blockchain APIs when working within the SEI ecosystem, or when cost-per-call pricing is preferable to subscription models.
Side effects
- Invalid address format in 'to' or 'from' fields returns a 400 or validation error
- Malformed hex in 'data' field causes parsing failure
- SEI network RPC node unavailable returns a 503 or timeout error
- Missing required fields may return incomplete estimates or errors
- Value field with unsupported format may cause computation failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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