{"uid":"cap_uq9BE6SxqlMWMOwJCOqhN","slug":"x402node-mempool-gas-price-estimator-da941ddd","name":"x402node Mempool Gas Price Estimator","description":"Real-time gas estimates from the pending block base fee with slow/standard/fast tiers in gwei on EVM chains. mempool gas, pending gas, gas estimate, current gas price, fast gas, transaction fee Accepts payment on Base or Solana — either network works.","url":"https://api.x402node.dev/chain/mempool-gas?utm_source=zero.xyz","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"],"type":"string"},"queryParams":{"type":"object","properties":{"chain":{"type":"string","description":"ethereum (default), base, arbitrum, optimism, polygon"}}}},"additionalProperties":false}}},"responseSchema":null,"example":{"request":{"chain":"ethereum"},"response":{"note":"Estimates from pending block baseFee; priority tip varies by mempool congestion.","_hint":"x402 paid endpoints for AI agents — x402node.dev (utilities) · cn402.com (Chinese culture)","chain":"ethereum","estimates":{"fast":0.3149,"slow":0.2099,"standard":0.2519},"baseFeeGwei":0.20993087,"gasPriceGwei":0.221035622,"pendingBlock":25342730}},"exampleRequest":{"chain":"ethereum"},"tags":["x402"],"displayCostAmount":"0.004","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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":"$0.004/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_p7GRu09iDImYne3yb6sBD","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.004","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns real-time EVM gas price estimates (slow, standard, fast tiers in gwei) derived from the pending block base fee","exampleAgentPrompt":"What are the current gas prices on Ethereum right now — give me the slow, standard, and fast tier estimates in gwei so I know what to set for my transaction?","exampleUseCases":null,"resultDescription":"Returns three gas price tiers (slow, standard, fast) in gwei derived from the current pending block base fee, enabling the caller to choose an appropriate gas price for desired transaction confirmation speed on a given EVM chain.","failureModes":["Unsupported or invalid chain ID returns an error or empty response","Mempool data temporarily unavailable due to node connectivity issues","Rate limit exceeded if called too frequently without payment","Payment not processed correctly results in 402 response","Chain currently has no pending block data available"],"whenToPreferThis":"Use this endpoint when you need real-time, tiered gas price recommendations (slow/standard/fast) for EVM transactions and want estimates rooted in the actual pending block base fee rather than historical averages. Prefer it over static or cached gas APIs when transaction timing and cost accuracy matter, especially for DeFi operations, NFT mints, or any time-sensitive on-chain action.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T18:41:36.781Z","isFirstParty":false,"canonicalSlug":"x402node-mempool-gas-price-estimator-da941ddd"}