{"uid":"cap_YVttIpxmnCwAejNqprUQ6","slug":"hermes-data-api-ethereum-gas-fees-2c3a381e","name":"Hermes Data API – Ethereum Gas Fees","description":"Pay-per-call data API: crypto prices (CoinGecko), China A-share quotes (Sina), weather (Open-Meteo), forex rates, and Ethereum gas fees. Payments via x402 protocol, USDC on Base.","url":"https://x402-api-blond.vercel.app/eth/gas","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","toolName","inputSchema"],"properties":{"type":{"type":"string","const":"mcp"},"example":{"type":"object"},"toolName":{"type":"string"},"description":{"type":"string"},"inputSchema":{"type":"object"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"ts":1750000000000,"source":"etherscan","fast_gwei":0.083,"safe_gwei":0.07,"propose_gwei":0.074}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_krcbNMP6kByO-xzRR2rRX","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns current Ethereum network gas prices (fast, safe, and propose tiers in Gwei) sourced from Etherscan, paid per-call via x402/USDC.","exampleAgentPrompt":"What's the current Ethereum gas price — give me the fast, safe, and propose Gwei tiers so I know what to set for my transaction right now?","exampleUseCases":[{"title":"DeFi transaction timing optimization","prompt":"Before I submit my Ethereum swap, check the current gas prices and tell me the fast, safe, and propose Gwei tiers so I can decide whether to send now or wait."},{"title":"Smart contract deployment cost check","prompt":"I'm about to deploy a contract on Ethereum — what's the current gas price in Gwei across fast, safe, and propose tiers?"},{"title":"Automated gas price alerting","prompt":"Keep an eye on Ethereum gas fees and let me know when the safe Gwei drops below 0.05 so I can time my transaction cheaply."}],"resultDescription":"A JSON object with a Unix millisecond timestamp, the data source ('etherscan'), and three Gwei values: fast_gwei (quick inclusion), safe_gwei (low-priority), and propose_gwei (standard recommended), e.g. {ts: 1750000000000, source: 'etherscan', fast_gwei: 0.083, safe_gwei: 0.07, propose_gwei: 0.074}.","failureModes":["Payment failure: x402 USDC payment on Base rejected or insufficient balance — endpoint returns 402 Payment Required","Upstream Etherscan API unavailable — may return 503 or stale data","Invalid MCP tool descriptor structure in request body — returns 400 Bad Request","Network timeout fetching from Etherscan — delayed or error response"],"whenToPreferThis":"Choose this endpoint when you need real-time Ethereum gas fee data in a pay-per-call, no-subscription model using USDC on Base via x402 protocol. Ideal for agents operating in crypto-native or DeFi contexts that already handle x402 payments and need fresh Gwei tiers (fast/safe/propose) without managing Etherscan API keys directly.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T18:31:52.707Z","isFirstParty":false}