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Onchain Toolkit Gas Price API
x402
Onchain Toolkit Gas Price API is a paid API for AI agents from onchain-toolkit.bowling-anthony.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Returns live gas prices in gwei plus the cost of a plain ETH transfer for Ethereum, Base, Arbitrum, Optimism, and Polygon, with multi-chain comparison in a single call.
Price / call$0.005
Success—
StatusUnknown
How this service works
Live gas price on Ethereum, Base, Arbitrum, Optimism or Polygon, in gwei plus the cost of a plain transfer. Compare several chains in one call.
Output
Returns a JSON object with an array of chain entries, each containing the chain name and current gas price in gwei, plus the estimated cost of a standard ETH transfer on that chain.
Example use cases
Pick cheapest chain before bridging
“Before I bridge my ETH, can you check live gas prices across Ethereum, Base, Arbitrum, Optimism, and Polygon and tell me which chain will cost the least for a plain transfer right now?”
Monitor gas spikes for DeFi bot
“My trading bot needs to know if Ethereum gas is above 30 gwei right now — can you fetch the current gas price on Ethereum and tell me the gwei value and what a plain transfer would cost?”
Compare L2 fees for wallet UX
“I'm building a wallet and want to show users a fee comparison — can you pull the current gas price in gwei and plain transfer cost for Base, Arbitrum, and Optimism in one shot?”
Technical details
Endpoint
GEThttps://onchain-toolkit.bowling-anthony.workers.dev/gasWhen to prefer
Use this endpoint when you need real-time gas prices across one or more EVM-compatible chains (Ethereum, Base, Arbitrum, Optimism, Polygon) in a single lightweight call. It is particularly useful for multi-chain fee comparison, pre-flight transaction cost estimation, and automated gas monitoring workflows. Prefer this over reading gas from an RPC node directly when you want a hosted, no-setup solution that covers multiple chains simultaneously.
Side effects
- Chain RPC node is temporarily unavailable, returning a partial or empty response
- Network timeout if an upstream EVM node is slow
- Invalid or unsupported chain name in query params returns an error or empty result
- Rate limiting if called excessively without payment
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chains": [
{
"chain": "base",
"gasPriceGwei": 0.006
}
]
}
}Tags
x402
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