{"uid":"cap_JwGw6zXjG8LPxhvtq1GXa","slug":"op-mainnet-gas-oracle-5c77392a","name":"OP Mainnet Gas Oracle","description":"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).","url":"https://onchaincheck.dev/optimism/gas?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"required":{"type":"string"},"properties":{"type":"string"}}},"responseSchema":{"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"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_9OI4jsOzAdonkvz2JSQf8","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"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.","exampleAgentPrompt":"What are the current gas fees on OP Mainnet — give me the base fee, gas price, and how much a native ETH transfer and an ERC-20 transfer would cost in both ETH and USD right now?","exampleUseCases":[{"title":"Pre-transaction gas cost check","prompt":"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?"},{"title":"Gas timing decision for DeFi bot","prompt":"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?"},{"title":"Onchain cost monitoring dashboard","prompt":"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."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T12:43:00.237Z","isFirstParty":false,"canonicalSlug":"op-mainnet-gas-oracle-5c77392a"}