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Synapse API — Avalanche Gas Estimator
x402
Synapse API — Avalanche 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 2026-09-14).
Estimates the gas cost for a transaction on the Avalanche blockchain network given sender, recipient, value, and calldata.
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 unit amount for the described Avalanche transaction, allowing the caller to predict fees before broadcasting the transaction to the network.
Example use cases
Pre-flight DeFi swap cost check
“Before I submit this swap on Avalanche, estimate the gas for a transaction from my wallet 0xAbC...123 to the Trader Joe router at 0xDeF...456 with this calldata 0x38ed1739... and 0 value so I know if it's worth it at current gas prices.”
Smart contract deployment gas forecast
“I'm about to deploy a new ERC-20 contract on Avalanche — can you estimate how much gas it'll take using my deployer address 0x111...aaa as the sender, no recipient, and this bytecode as the data field?”
AVAX native transfer fee estimation
“How much gas will it cost to send 2 AVAX from 0x222...bbb to 0x333...ccc on the Avalanche network? Just a plain transfer, no extra data.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/avalanche/gas/estimateWhen to prefer
Use this endpoint when you need a quick, pay-per-call gas estimate specifically for the Avalanche network without managing your own RPC infrastructure. It's ideal for agents that need to pre-check transaction costs before execution, especially in multi-chain workflows where Avalanche is one of many supported chains.
Side effects
- Invalid or malformed Ethereum-style address in 'to' or 'from' fields — returns error
- Malformed hex string in 'data' field — parsing error
- Transaction would revert on-chain (e.g. insufficient balance, failed require) — gas estimation may fail or return error
- Network connectivity issues with Avalanche RPC — timeout or upstream error
- Missing required fields — validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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