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Vextorium Gas Price Multi-Chain Comparator
x402
Vextorium Gas Price Multi-Chain Comparator is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-28).
Returns current gas prices and estimated USD transaction costs (native transfer, ERC-20 transfer, swap) across Base, Ethereum, Arbitrum, Optimism, and Polygon, plus identifies the cheapest chain for swaps.
Price / call$0.004
Success—
StatusUnknown
How this service works
558 pay-per-call data APIs for AI agents: Solana and EVM on-chain data, tokenized stocks, DeFi, Hyperliquid, economy and official statistics, FX, validation, web and developer tools. Pay in USDC via x402.
Output
Returns a JSON object with an array of per-network gas data (gas in gwei, native token symbol, USD cost of native transfer, ERC-20 transfer, and swap), the name of the cheapest chain for swapping, and current native asset prices in USD (ETH, POL). Also includes a note about L2 chains having an additional L1 data fee not captured in the estimates.
Example use cases
Finding cheapest chain for DeFi swap
“I want to do a DeFi swap but gas fees vary a lot — can you check gas prices across Base, Arbitrum, Optimism, Ethereum, and Polygon right now and tell me which chain would be cheapest for a swap?”
Estimating token transfer costs before bridging
“Before I bridge my USDC, can you tell me how much an ERC-20 token transfer would cost in USD on each of the major EVM chains right now — Base, Ethereum, Arbitrum, Optimism, and Polygon?”
Monitoring gas spikes for automated alert
“Check the current gas prices in gwei and estimated swap costs across all five chains — Base, Ethereum, Arbitrum, Optimism, and Polygon — and let me know if Ethereum mainnet gas is above 5 gwei.”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/gas-compare-chains?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a real-time, multi-chain gas fee comparison across the five major EVM networks (Base, Ethereum, Arbitrum, Optimism, Polygon) in a single call. It is ideal when you need to route a transaction to the cheapest chain, estimate USD costs for common transaction types (native transfer, ERC-20 transfer, swap), or surface gas data to end users before they sign a transaction. Prefer this over individual chain RPC calls when you need normalized, USD-denominated cost estimates across all chains simultaneously.
Side effects
- External RPC or gas oracle unavailable — may return null values for affected networks
- Native token price feed unavailable — price fields may be null (e.g. pol: null)
- Network congestion or timeout causing stale or missing gas data for one or more chains
- Invalid or missing request body causing 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "On L2s (Base, Arbitrum, Optimism) a small L1 data fee is added that is not included here.",
"networks": [
{
"native": "ETH",
"network": "base",
"gas_gwei": 0.006008,
"swap_usd": 0.00293,
"transfer_usd": 0.00034,
"token_transfer_usd": 0.00106
},
{
"native": "ETH",
"network": "ethereum",
"gas_gwei": 0.902926,
"swap_usd": 0.44,
"transfer_usd": 0.05133,
"token_transfer_usd": 0.15889
}
],
"cheapest_swap": "optimism",
"native_prices_usd": {
"eth": 2707.22696629,
"pol": null
}
}
}Tags
x402
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