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L2 Gas Price Comparison (Ethereum + Base + Polygon + Arbitrum + Optimism)
x402
L2 Gas Price Comparison (Ethereum + Base + Polygon + Arbitrum + Optimism) is a paid API for AI agents from agent402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Returns a real-time gas price snapshot across Ethereum and major L2 networks, sorted cheapest-first, to help route transactions to the most cost-effective chain.
Price / call$0.002
Success—
StatusUnknown
How this service works
Current gas snapshot across Ethereum + supported L2s (Base, Polygon, Arbitrum, Optimism), sorted cheapest-first. Returns gas price in gwei, latest block number, chain id, and an isL2 flag per chain. Use to route a transaction to the cheapest viable L2 or to track L1→L2 gas spread.
Output
A ranked list of networks (cheapest-first) each with: gas price in gwei, latest block number, chain ID, and an isL2 boolean flag. Covers up to 5 networks: Ethereum mainnet, Base, Polygon, Arbitrum, and Optimism.
Example use cases
Example prompt
“Before I send this transaction, check the current gas prices across Ethereum, Base, Arbitrum, Optimism, and Polygon and tell me which chain is cheapest right now.”
Technical details
Endpoint
POSThttps://agent402.tools/api/l2-gas-comparisonWhen to prefer
Use this endpoint when an agent needs to dynamically route a transaction to the cheapest EVM-compatible chain, or when a user wants a real-time, cross-chain gas fee comparison before committing to a network. Prefer this over manually querying individual chain RPCs or static fee tables.
Side effects
- Network RPC unreachable for one or more chains — partial results may be returned
- Invalid network name in the 'networks' array — endpoint may ignore unknown values or return an error
- All networks unavailable — empty results or timeout
- Payment failure (x402) — call rejected before execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| networks | array | Subset of networks to query. Default = all 5. Supported: ethereum, base, polygon, arbitrum, optimism. |
Output
Schema · Response
{
"type": "json",
"example": {
"source": "alchemy",
"cheapest": "base",
"networks": [
{
"isL2": true,
"chainId": 8453,
"network": "base",
"blockNumber": 22000000,
"gasPriceWei": "100000000",
"gasPriceGwei": 0.1
},
{
"isL2": true,
"chainId": 42161,
"network": "arbitrum",
"blockNumber": 300000000,
"gasPriceWei": "100000000",
"gasPriceGwei": 0.1
},
{
"isL2": false,
"chainId": 1,
"network": "ethereum",
"blockNumber": 22000000,
"gasPriceWei": "15000000000",
"gasPriceGwei": 15
}
],
"queriedAt": "2026-06-22T19:00:00.000Z"
}
}Tags
x402
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