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Genexxis Gas Comparison — Multi-Chain EVM Gas Cost Comparator
x402
Genexxis Gas Comparison — Multi-Chain EVM Gas Cost Comparator is a paid API for AI agents from gas.genexxis.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-11-04).
Returns the USD cost of a transaction (by gas units) across Ethereum, Base, Arbitrum, OP Mainnet, Polygon, and BNB Chain sorted cheapest-first, with slow/standard/fast speed tiers.
Price / call$0.002
Success—
StatusUnknown
How this service works
What a transaction costs right now, in USD, on Ethereum, Base, Arbitrum, OP Mainnet, Polygon and BNB Chain. Live from public RPCs (eth_feeHistory over the last 20 blocks: base fee + slow/standard/fast priority fees), native token prices from Coinbase/Binance, and the L1 data fee for rollups (OP-stack GasPriceOracle, Arbitrum ArbGasInfo). Gives USD cost for a native transfer, an ERC-20 transfer and a Uniswap-style swap, or compares all 6 chains for any gas amount. Cached 15 s.
Output
A JSON object containing the input gas units, an array of chains (optimism, base, bsc, ethereum, arbitrum, polygon) each with a costUsd object showing slow/standard/fast prices in USD and the native token symbol, sorted cheapest first, plus a 'failed' array listing any chains that could not be fetched.
Example use cases
Find cheapest chain for token swap
“I'm about to do a token swap that uses about 150,000 gas — which EVM chain would be cheapest for that right now, and what's the cost at standard speed?”
DeFi dashboard live fee widget
“Pull the current gas costs for a 21,000 gas transfer across all major EVM chains, slow through fast, so I can show users which network to pick.”
Smart contract deployment cost audit
“I need to deploy a contract that uses about 2,000,000 gas — can you compare what that would cost in USD on Ethereum, Base, Arbitrum, Optimism, Polygon, and BNB Chain right now at each speed tier?”
Technical details
Endpoint
GEThttps://gas.genexxis.com/compare?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a real-time, side-by-side USD cost comparison of a specific transaction across all major EVM chains at once, with slow/standard/fast tiers. Prefer it over single-chain gas endpoints when the goal is chain selection or cost optimization rather than just knowing the current gas price on one specific network.
Side effects
- Invalid gas units outside 21000–30000000 range may return an error or default to 65000
- One or more chains may appear in the 'failed' array if their RPC is temporarily unavailable
- Stale or cached gas prices if blockchain RPCs are slow to respond
- HTTP 402 if payment header is missing or USDC payment fails
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"gas": 65000,
"chains": [
{
"chain": "optimism",
"costUsd": {
"fast": 0.000763,
"slow": 0.00000167,
"standard": 0.0000169
},
"nativeToken": "ETH"
},
{
"chain": "base",
"costUsd": {
"fast": 0.00229,
"slow": 0.000817,
"standard": 0.000938
},
"nativeToken": "ETH"
},
{
"chain": "bsc",
"costUsd": {
"fast": 0.00476,
"slow": 0.00238,
"standard": 0.00238
},
"nativeToken": "BNB"
},
{
"chain": "ethereum",
"costUsd": {
"fast": 0.159,
"slow": 0.00691,
"standard": 0.00753
},
"nativeToken": "ETH"
}
],
"failed": []
}
}Tags
x402
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