{"uid":"cap_wxI9DgcK-6T87ZM51aHNq","slug":"whisperbox-x402-gas-fee-lookup-ccfe224e","name":"WhisperBox x402 Gas Fee Lookup","description":"x402 payment-gated data suite for AI agents. Multi-chain gas fees across 12 EVM networks with real-time comparison, history, and recommendations. Plus currency rates, timezone conversion, and QR code generate/scan. $0.01-$0.02 USDC on Base.","url":"https://x402.whisperbox.my.id/x402/gas","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["chain"],"properties":{"chain":{"type":"string"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"chain":"eth","gas_gwei":25}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_c7jP5WS2x8uQhdNH5Rg4a","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns real-time gas fees in Gwei for a specified EVM-compatible blockchain network, payable via x402 micropayment.","exampleAgentPrompt":"What's the current gas price in Gwei on Ethereum right now? I want to know if it's a good time to send a transaction.","exampleUseCases":[{"title":"Pre-transaction gas check","prompt":"Before I submit this Ethereum transaction, can you check what the current gas fee is in Gwei so I know what to expect to pay?"},{"title":"Cheapest chain selection","prompt":"I need to deploy a smart contract and want to pick the cheapest chain — can you check gas fees on Polygon for me right now?"},{"title":"DeFi timing decision","prompt":"Check the current gas price on Arbitrum for me — I'm trying to figure out if now is a good time to make a swap or if I should wait for fees to drop."}],"resultDescription":"A JSON object containing the chain identifier and the current gas price in Gwei (e.g. {\"chain\": \"eth\", \"gas_gwei\": 25}). Useful for real-time fee estimation before submitting on-chain transactions.","failureModes":["Missing or invalid 'chain' query parameter returns an error or empty response","Unsupported chain name results in a 400 or equivalent error","x402 payment failure (insufficient USDC balance or wallet not configured) blocks the request","Network connectivity issues to upstream gas oracles may return stale or unavailable data"],"whenToPreferThis":"Choose this endpoint when an AI agent needs real-time gas fee data for a specific EVM chain before executing or recommending an on-chain transaction. Prefer it over static fee tables or manual estimation when freshness matters. It costs only $0.02 USDC per call via x402, making it cost-effective for frequent polling or pre-transaction checks in automated workflows.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:41:27.254Z","isFirstParty":false}