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x402node Gas Price Comparison API
x402
x402node Gas Price Comparison API is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Returns live gas prices across Base, Ethereum, Arbitrum, Optimism, Polygon, and BSC sorted cheapest-first so agents can pick the lowest-cost chain right now.
Price / call$0.005
Success—
StatusUnknown
How this service works
Live gas price across Base, Ethereum, Arbitrum, Optimism, Polygon and BSC sorted cheapest first - lets agents pick the cheapest chain to execute an operation right now, real-time data that changes constantly and LLMs cannot know. gas comparison, cheapest chain, multi chain gas, gas prices, which chain cheapest, cross chain gas Accepts payment on Base or Solana — either network works.
Output
A list of EVM chains (Base, Ethereum, Arbitrum, Optimism, Polygon, BSC) with their current gas prices, sorted ascending from cheapest to most expensive, reflecting live on-chain data at the moment of the call.
Example use cases
Example prompt
“Which blockchain has the cheapest gas fees right now out of Base, Ethereum, Arbitrum, Optimism, Polygon, and BSC — give me the full list sorted from cheapest to most expensive so I can decide where to execute my transaction.”
Technical details
Endpoint
GEThttps://api.x402node.dev/chain/gas-compareWhen to prefer
Use this endpoint when an agent needs to dynamically route a transaction or operation to the cheapest available EVM chain at execution time. Unlike LLM knowledge which is static, this provides real-time gas data that changes block-by-block. Prefer this over manual chain selection or hardcoded defaults whenever minimizing transaction cost matters.
Side effects
- RPC node unreachable for one or more chains — partial results or error returned
- Network congestion causing stale or delayed gas data
- Payment not accepted — 402 response if USDC payment header missing or insufficient
- Rate limiting if called too frequently without valid payment
Input
{}Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
{
"note": "Live gas price across chains, sorted cheapest first. Agents use to pick the cheapest chain to execute. Note: L2 gas excludes L1 data fee; actual cost also depends on token price per chain.",
"_hint": "x402 paid endpoints for AI agents — x402node.dev (utilities) · cn402.com (Chinese culture)",
"chains": [
{
"chain": "optimism",
"gasPriceGwei": 0.001
},
{
"chain": "base",
"gasPriceGwei": 0.006
},
{
"chain": "arbitrum",
"gasPriceGwei": 0.02031
},
{
"chain": "bsc",
"gasPriceGwei": 0.05
},
{
"chain": "ethereum",
"gasPriceGwei": 0.12079
}
],
"source": "multi-rpc",
"cheapest": "optimism",
"timestamp": "2026-06-17T21:37:29.649Z"
}Tags
x402
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