{"uid":"cap_mVdY7vEehnOfQCUpndmFX","slug":"mempool-whale-transaction-monitor-ca96363f","name":"Mempool Whale Transaction Monitor","description":"67 paid endpoints for on-chain, forex, stocks & market intelligence","url":"https://trading-hub-v4-omega.vercel.app/api/mempool/whale-tx?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.2","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":"$0.2/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.2","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.2","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_BHG_Xxc7yP9hUsmd5BVk5","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.2","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Detects and returns large on-chain transactions (whale movements) currently in the mempool before they are confirmed","exampleAgentPrompt":"Can you check the mempool right now and show me any large pending crypto transactions — say anything over $500,000 — on Ethereum so I can see which whales are moving funds before they confirm?","exampleUseCases":[{"title":"Front-run risk detection for DeFi traders","prompt":"Check the Ethereum mempool for any large pending swaps or transfers over $1 million — I want to know if a whale is about to move the market before my trade goes through."},{"title":"Whale wallet surveillance for portfolio alerts","prompt":"Scan the mempool and tell me if the wallet 0xABC...123 has any large unconfirmed transactions right now — I want to know before the block confirms."},{"title":"On-chain intelligence for crypto news desk","prompt":"Pull the biggest pending transactions in the Bitcoin and Ethereum mempools right now — anything over $2 million — so I can report on whale activity happening in real time."}],"resultDescription":"Returns a list of large unconfirmed transactions currently sitting in the mempool, including transaction hashes, sender and receiver wallet addresses, transferred value, token type, and current mempool status — enabling pre-confirmation whale activity analysis.","failureModes":["Mempool may be empty or low-activity during off-peak hours, returning an empty result set","Minimum threshold filter too high may yield no results","Network congestion can cause stale or delayed mempool snapshots","Invalid or unsupported blockchain network identifier returns an error","Rate limiting or payment failure returns 402 or 429 status","Transaction may confirm between request and response, disappearing from mempool"],"whenToPreferThis":"Use this endpoint when you need real-time visibility into large unconfirmed on-chain transactions before block confirmation — especially for front-running detection, whale surveillance, DeFi risk management, or on-chain news monitoring. Prefer this over block-confirmed transaction APIs when timing before confirmation matters, and over general block explorers when you need programmatic, filtered, high-value-only mempool data via a pay-per-use API.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-11-03T00:50:00.614Z","isFirstParty":false,"canonicalSlug":"mempool-whale-transaction-monitor-ca96363f"}