{"uid":"cap_066MbwdmcaNYj6FwEipfk","slug":"chainray-mempool-stream-6361cfc9","name":"ChainRay Mempool Stream","description":"The most complete blockchain data and intelligence service for AI agents. 93 endpoints across 46 chains, from gas fees to DeFi analytics, with real-time streams, intent routing, and verifiable proofs. Pay-per-request via x402.","url":"https://chainray.online/stream/mempool","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":"Blockchain network (e.g., base, ethereum, polygon)"}}}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.08","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":"$0.08/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.08","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.08","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_CW0ZU73ZkSUu4r64P5jew","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.08","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Streams real-time pending transactions from a blockchain mempool for a specified chain","exampleAgentPrompt":"Stream live mempool transactions on Ethereum so I can see what pending transactions are in the queue right now.","exampleUseCases":[{"title":"Detect front-running opportunities in real time","prompt":"Watch the mempool on Ethereum and alert me whenever you spot large pending swaps or token transfers that could be front-run for profit."},{"title":"Monitor DeFi liquidation cascade risks","prompt":"Stream pending transactions across Polygon and Base simultaneously so you can catch liquidation events before they hit the blockchain and warn me about cascading risks."},{"title":"Track MEV activity across multiple chains","prompt":"Give me a live view of pending transactions on Ethereum and Arbitrum so I can see which transactions have high MEV exposure and understand the current network congestion."}],"resultDescription":"A real-time stream of pending (unconfirmed) transactions in the mempool of the specified blockchain network, including transaction details such as sender, receiver, value, gas price, and data payload.","failureModes":["Unsupported chain specified — returns error indicating chain is not available","Missing chain parameter — may default to a chain or return a validation error","Payment not processed — 402 response requiring x402 USDC payment","Network connectivity issues causing stream interruption","Rate limiting if too many simultaneous streams are opened"],"whenToPreferThis":"Use this endpoint when you need real-time visibility into unconfirmed transactions before they are included in a block — ideal for MEV detection, front-running protection, DeFi arbitrage monitoring, or any use case requiring sub-block-time transaction awareness across 46 supported chains.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T12:49:46.054Z","isFirstParty":false}