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x402 Gas Price Oracle — Multi-Chain Live Gas & Swap Cost
x402
x402 Gas Price Oracle — Multi-Chain Live Gas & Swap Cost is a paid API for AI agents from x402-services-production.up.railway.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Returns live gas prices and estimated USD swap costs across major EVM chains (Base, Ethereum, Arbitrum, Optimism, Polygon, BSC), optionally filtered by chain.
Price / call$0.005
Success—
StatusUnknown
How this service works
Live gas prices across major chains (Base, Ethereum, Arbitrum, Optimism, Polygon, BSC) with estimated USD cost of a swap. Send { chains? }. Time and route transactions for the cheapest execution.
Output
Returns current gas prices (in gwei or native units) and estimated USD cost of a standard swap for each requested chain (or all supported chains by default: Base, Ethereum, Arbitrum, Optimism, Polygon, BSC), enabling cost-based routing decisions.
Example use cases
Find cheapest chain for swap
“I want to do a token swap but don't want to overpay on gas — can you check all the major EVM chains right now and tell me which one would be the cheapest to execute on?”
Time transaction for lowest gas
“Gas has been expensive lately on Ethereum. Can you keep an eye on current gas prices across Ethereum, Arbitrum, and Optimism and let me know when it looks like a good time to send my transaction?”
Compare L2 swap costs now
“I'm trying to decide whether to do my DeFi swap on Base, Arbitrum, or Optimism — what are the current gas fees on each and how much would a swap actually cost me in USD?”
Technical details
Endpoint
POSThttps://x402-services-production.up.railway.app/api/exec/gasWhen to prefer
Use this endpoint when an agent needs to compare real-time gas prices and swap costs across multiple EVM chains simultaneously to route a transaction or time execution for minimum cost. Prefer this over chain-specific RPC calls when multi-chain comparison is the goal.
Side effects
- Unsupported chain identifier returns an error or is silently ignored
- Network congestion or RPC outage may cause stale or missing data for a specific chain
- Empty chains object may default to all chains or return an error depending on payload parsing
- Rate limiting if called too frequently without valid x402 payment
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chains | object | Optional array of chains; defaults to all supported |
Tags
x402
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