{"uid":"cap_SB_xM624SRcP6HLrGmMzB","slug":"quantaflow-mempool-api-gateway-fcfd4c41","name":"QuantaFlow Mempool API Gateway","description":"Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.","url":"https://quanta-roan.vercel.app/api/service/mempool?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"body":{"type":"string","description":"Optional JSON body forwarded to POST requests."},"path":{"type":"string","description":"Path below the selected upstream origin."},"query":{"type":"object"},"method":{"enum":["GET","POST"],"type":"string"}}},"responseSchema":{"description":"The upstream response body and content type are passed through after successful payment."},"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_uFhQmpLiXN2dlYfW3CaR4","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":"Proxies POST requests to blockchain mempool data services via the x402 micropayment protocol, charging $0.01 USDC per call.","exampleAgentPrompt":"Check the current mempool for pending transactions on the network — I want to see what's unconfirmed right now and get fee congestion data.","exampleUseCases":[{"title":"Monitor pending transaction status","prompt":"Can you check the mempool to see if my transaction is still pending or if it's been dropped? I want to know its current status before I try to rebroadcast it."},{"title":"Estimate gas fees from mempool","prompt":"Pull the latest mempool data so I can see current fee levels and figure out what gas price I should set for my next transaction to get it confirmed quickly."},{"title":"Track mempool congestion for DeFi bot","prompt":"Fetch the current mempool state so my trading bot can assess network congestion and decide whether to submit a transaction now or wait for lower fees."}],"resultDescription":"The upstream mempool service's response body is passed through directly after successful x402 payment verification, including transaction lists, fee estimates, congestion metrics, or other blockchain mempool data depending on the path queried.","failureModes":["Payment failure: insufficient USDC balance or wallet not configured for x402 micropayments","Invalid path: upstream mempool endpoint not found returns a proxy error","Upstream timeout: mempool service is slow or unresponsive, causing a gateway timeout","Malformed body: invalid JSON in the body field causes upstream rejection","Network error: Vercel deployment or upstream web3 node is down"],"whenToPreferThis":"Choose this endpoint when you need pay-per-call access to blockchain mempool data without a long-term API subscription, especially in web3-native agent workflows already using the x402 micropayment protocol. Ideal for low-frequency or bursty mempool queries where per-call USDC billing is more economical than a monthly plan.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-16T18:43:56.587Z","isFirstParty":false,"canonicalSlug":"quantaflow-mempool-api-gateway-fcfd4c41"}