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Multi-Chain Gas Compare
x402
Multi-Chain Gas Compare is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-16).
Fetches live gas prices across five major EVM chains and returns ranked USD costs for a token transfer and DEX swap, identifying the cheapest chain to settle on.
Price / call$0.01
Success—
StatusUnknown
How this service works
Reads the live gas price on each major EVM chain an agent uses (base, arbitrum, optimism, ethereum, polygon) and turns it into the USD cost of the actions that matter — a plain transfer and a DEX swap — using live native-token prices. Returns one ranked answer with the cheapest chain, so an agent deciding where to settle doesn't make five RPC calls. A chain it could not read is 'unknown' and excluded from the pick, never guessed. Gas units are typical estimates. Not financial advice.
Output
Returns a ranked list of EVM chains (Base, Arbitrum, Optimism, Ethereum, Polygon) ordered from cheapest to most expensive, with the USD cost of a standard ETH transfer and a typical DEX swap on each chain based on live gas prices and live native token prices. Identifies the single cheapest chain for quick decision-making. Chains that could not be read are marked 'unknown' and excluded from the ranking.
Example use cases
Cheapest chain for DeFi settlement
“I need to settle a position and want to spend the least on gas — can you check live gas costs across all the major EVM chains and tell me which one is cheapest for a DEX swap right now in USD?”
Cross-chain cost dashboard for agent fleet
“Before any of my agents submit transactions, I want them to pull the current USD gas cost for a standard transfer on Base, Arbitrum, Optimism, Ethereum, and Polygon, ranked from cheapest to most expensive.”
Gas-aware routing for token bridge
“I'm about to bridge tokens and need to pick the destination chain — can you fetch live gas prices on all five major EVM chains and show me the USD cost of a transfer on each so I can pick the cheapest?”
Technical details
Endpoint
GEThttps://402.com.tr/api/x402/multi-chain-gas?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs to decide on which EVM chain to execute a transaction and wants a single ranked answer without making five separate RPC calls. Ideal for gas-aware routing logic in DeFi agents, bridging decisions, or cost optimization across L2s. Prefer this over manually querying each chain's gas API when you need USD-denominated costs (not just gwei) and a direct cheapest-chain recommendation.
Side effects
- One or more chains unreachable — those chains returned as 'unknown' and excluded from ranking rather than guessed
- Stale native token price if price feed is delayed — USD costs may be slightly off
- All chains unavailable — empty or error response returned
- Network timeout on RPC reads causing partial results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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