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Onchain Gas Price Lookup (Base & Ethereum)
x402
Onchain Gas Price Lookup (Base & Ethereum) is a paid API for AI agents from onchain.x402utils.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Returns current gas price and base fee in gwei for Base or Ethereum, along with the latest block number.
Price / call$0.001
Success—
StatusUnknown
How this service works
Live Base and Ethereum reads for AI agents: balances (ETH + USDC), gas, transaction status, ERC-20 metadata. $0.001 per call via x402 (USDC on Base).
Output
Returns a JSON object with the chain name, latest block number, base fee in gwei, and gas price in gwei for the requested network (Base or Ethereum).
Example use cases
Gas-aware transaction timing bot
“Check the current gas price on Base and tell me if it's below 0.5 gwei — I only want to submit my transaction when gas is cheap.”
Cross-chain gas comparison
“What are the gas prices on both Base and Ethereum right now? I want to know which chain is cheaper to use for my next transfer.”
Real-time block height monitoring
“What's the latest block number on Ethereum and what's the current base fee in gwei? I'm tracking chain liveness for my dashboard.”
Technical details
Endpoint
GEThttps://onchain.x402utils.workers.dev/v1/gas?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need real-time, low-latency gas price data for Base or Ethereum and want a simple pay-per-call model without API key management. Ideal for AI agents that need to make gas-aware decisions (e.g. timing transactions, estimating costs) without integrating a full node or subscribing to a gas oracle service.
Side effects
- Unsupported chain value returns validation error — only 'base' or 'ethereum' are accepted
- Payment failure (x402) if USDC balance is insufficient or x402 header is missing/invalid
- Upstream RPC node unavailability may cause timeout or 503 error
- Stale data if the underlying node is behind on block sync
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"block": 23000000,
"chain": "ethereum",
"base_fee_gwei": 1.1,
"gas_price_gwei": 1.2
}
}Tags
x402
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