{"uid":"cap_7YerCwS3YOZSILKmxdWbv","slug":"mcpfax-reliability-preflight-check-a48891fd","name":"MCPFax Reliability Preflight Check","description":"Advisory preflight on one endpoint before a consequential call: a bounded live probe (reachable, status, latency, MCP initialize, current x402 price and payTo) joined to our observed history (reliability over a stated window, payTo and price changes, first seen). Returns ALLOW, WARN or UNKNOWN. Never a guarantee. No evidence, no charge.","url":"https://mcpfax-reliability.bowling-anthony.workers.dev/preflight","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"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.008","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":"$0.008/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.008","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.008","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_WjvDPCp0L8xFYfTnl7E8O","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.008","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Runs a live preflight probe on a single HTTP/x402 endpoint and returns an ALLOW, WARN, or UNKNOWN advisory based on real-time reachability plus observed reliability history before you make a consequential call.","exampleAgentPrompt":"Before I call that paid MCP endpoint, can you run a preflight reliability check on it — I need to know if it's reachable, what it currently costs, where the payment goes, and whether it's been stable enough that I should trust it with a live request?","exampleUseCases":[{"title":"Pre-payment trust check for agent pipeline","prompt":"I'm about to have my agent automatically call a paid x402 endpoint in production — can you run a preflight on it first and tell me if it's safe to proceed, or if there are any reliability warnings I should know about?"},{"title":"Detect suspicious payTo address change","prompt":"Check this x402 endpoint before I call it — I want to know if the payTo wallet address has changed recently compared to what was observed historically, because that could indicate something sketchy is going on."},{"title":"Validate new vendor endpoint before onboarding","prompt":"We're evaluating a new MCP service provider and their endpoint — can you do a live preflight probe on it to see if it responds correctly, what the latency looks like, and whether its reliability history gives us enough confidence to onboard it?"}],"resultDescription":"Returns an advisory verdict of ALLOW, WARN, or UNKNOWN, combined with: live probe results (reachability, HTTP status, latency, MCP initialize handshake), current x402 price and payTo address, and historical signals (reliability score over a stated window, payTo and price change history, first-seen date). No guarantee is implied; no charge is made if no evidence is available.","failureModes":["Target endpoint is unreachable — probe fails with no reachability data, advisory likely UNKNOWN","No historical observation data available for the target — returns UNKNOWN with live probe only","Target URL malformed or unsupported type — returns validation error on input","MCPFax has no prior record of the endpoint — first-seen and reliability fields will be absent","Probe times out — latency field reflects timeout, advisory may degrade to WARN or UNKNOWN"],"whenToPreferThis":"Use this endpoint when an AI agent is about to make a consequential or paid call to an x402 or MCP endpoint and needs a low-cost advisory signal before committing. It is especially valuable when you want to combine live reachability with observed history (reliability trends, payTo stability, price changes) in a single call. Prefer this over a raw HTTP ping when you want a structured ALLOW/WARN/UNKNOWN verdict rather than just a status code, or when you are onboarding a new vendor endpoint and need trust signals before automating payments.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T12:37:48.967Z","isFirstParty":false}