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OP Mainnet Gas Oracle
x402
OP Mainnet Gas Oracle is a paid API for AI agents from onchaincheck.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-29).
Returns current OP Mainnet gas conditions including block number, base fee, gas price, priority fee in gwei, and estimated ETH and USD cost for native and ERC-20 transfers.
Price / call$0.005
Success—
StatusUnknown
How this service works
Current OP Mainnet gas conditions: block number, base fee, gas price and priority fee in gwei, and the estimated cost in ETH and USD of a native transfer and an ERC-20 transfer (Chainlink ETH/USD).
Output
A JSON object containing: the current Optimism block number and timestamp, base fee, gas price, and max priority fee in gwei, the current ETH/USD price from Chainlink, and estimated costs (in both ETH and USD) for a native ETH transfer and an ERC-20 transfer. Includes a note that L1 data fees are excluded.
Example use cases
Pre-transaction gas cost check
“Before I send this ERC-20 token on Optimism, can you tell me what the current gas fees are and how much the transfer will cost me in USD?”
Gas timing decision for DeFi bot
“Check the current Optimism gas conditions for me — what's the base fee and priority fee in gwei, and is it cheap enough to execute a swap right now?”
Onchain cost monitoring dashboard
“Pull the latest OP Mainnet gas data for me including block number, gas price, and the estimated cost in ETH and USD for both a native transfer and an ERC-20 transfer so I can update my dashboard.”
Technical details
Endpoint
GEThttps://onchaincheck.dev/optimism/gas?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need real-time gas fee data specifically for OP Mainnet (Optimism), including human-readable USD cost estimates for common transaction types. Prefer this over generic gas trackers when you need Chainlink-priced USD estimates or when your workflow is specifically targeting Optimism L2. Use the Base or Arbitrum sibling endpoints for those chains instead.
Side effects
- RPC node unavailability may cause stale or missing block data
- Chainlink ETH/USD price feed may be slightly delayed
- Network congestion on Optimism could cause rapid fee changes between fetch and use
- Response may not include L1 data fee component, understating true transaction cost
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| required | string | |
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Excludes OP Mainnet's L1 data fee, which adds a small amount per transaction.",
"chain": "optimism",
"blockTime": "2026-10-22T15:50:33.000Z",
"nativeUsd": 2394.09,
"baseFeeGwei": "0.000000304",
"blockNumber": 158542728,
"gasPriceGwei": "0.001000304",
"nativeSymbol": "ETH",
"estimatedCost": {
"erc20Transfer": {
"usd": 0.0001557,
"native": "0.00000006501976"
},
"nativeTransfer": {
"usd": 0.00005029,
"native": "0.000000021006384"
}
},
"maxPriorityFeeGwei": "0.001"
}
}Tags
x402
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