{"uid":"cap_KZiQuUiRRMIasFEXnO_Jp","slug":"x402-chain-intel-pending-mempool-transactions-7f0fee1e","name":"x402 Chain Intel – Pending Mempool Transactions","description":"27 paid endpoints for trading bots","url":"https://x402-chain-intel.vercel.app/api/mempool/pending","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.19","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":"$0.19/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.19","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.19","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_a6zMxDRerftYKfTN9H5PW","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.19","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches pending (unconfirmed) mempool transactions from the blockchain for trading bot analysis","exampleAgentPrompt":"Pull the current pending mempool transactions on Ethereum so I can see any large unconfirmed DEX swaps my trading bot should be aware of right now.","exampleUseCases":[{"title":"Front-running signal detection","prompt":"Show me all large pending token swaps sitting in the Ethereum mempool right now — I need my trading bot to check for front-running opportunities before they get confirmed."},{"title":"Mempool congestion monitoring","prompt":"What does the mempool look like right now? I want to know if there are a lot of pending transactions piling up and what gas prices they're bidding so my bot can time its next trade."},{"title":"Wallet-specific pending activity tracking","prompt":"Check the mempool for any unconfirmed transactions from wallet 0xAbC...123 — I want to know if they've submitted anything that hasn't been mined yet."}],"resultDescription":"Returns a list of pending (unconfirmed) blockchain transactions currently sitting in the mempool, likely including transaction hashes, sender/receiver addresses, token amounts, gas prices, and timestamps — structured for consumption by trading bots and on-chain analytics tools.","failureModes":["Mempool node temporarily unavailable returns 5xx error","Invalid or unsupported chain parameter returns 4xx","Payment verification failure returns 402 if USDC payment is not correctly attached","Empty result if mempool is unusually low-activity","Stale data if node is lagging behind the network tip"],"whenToPreferThis":"Choose this endpoint when you need real-time visibility into unconfirmed blockchain transactions for time-sensitive trading strategies such as MEV detection, sandwich attack monitoring, or front-running analysis. Prefer this over block-confirmed data endpoints when sub-block latency matters. Best suited for automated trading bots that need mempool intelligence priced per-call at $0.19 USDC via the x402 payment protocol.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:52:50.697Z","isFirstParty":false}