{"uid":"cap_lw1Ar76ut-IZUF0Rg8Atb","slug":"x402-broker-preflight-mcp-a2a-x402-meta-router-capability-check-557ebe77","name":"X402-Broker Preflight – MCP/A2A/x402 Meta-Router Capability Check","description":"Universal B2A/A2A/MCP Meta-Router & Autonomous Tool Marketplace indexing 7,340+ live capabilities across x402 v2 (5-chain EVM USDC), IETF MPP, and L402 with TDQS quality scoring and zero-fee pass-through execution.","url":"https://x402broker.com/v1/preflight?utm_source=zero.xyz","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","POST"],"type":"string"},"queryParams":{"type":"object","properties":{"url":{"type":"string"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"data":{},"status":"ok","roi_proof":{"compression_ratio_pct":91.4}}},"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_ANiycVWMu7ecbFvlGMROf","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":"Performs a preflight lookup against the X402-Broker meta-index to retrieve capability routing metadata, quality scores, and execution parameters for a given MCP server, x402 API, or A2A agent endpoint URL.","exampleAgentPrompt":"Do a preflight check on this URL using the X402-Broker to see if it's indexed, get its quality score, and find out how to route a GET request to it: https://some-mcp-tool.com/api/endpoint","exampleUseCases":[{"title":"Validate MCP tool before agent call","prompt":"Before my agent calls that MCP server at https://weather-mcp.example.com/forecast, do a preflight check via X402-Broker to confirm it's live, indexed, and get its quality score and routing details."},{"title":"Discover best-scored x402 API for task","prompt":"I need to find whether https://translate-api.example.com/v1/translate is registered in the X402-Broker index — can you preflight it with a GET method and tell me its TDQS score and compression ratio?"},{"title":"Route A2A agent request safely","prompt":"Before my workflow routes to the A2A agent at https://summarizer-agent.example.com, run a preflight lookup on X402-Broker to get the execution parameters and check if it supports GET so I know it's safe to call."}],"resultDescription":"Returns a JSON object with a 'status' field ('ok' or error), a 'data' object containing routing metadata and capability descriptors for the queried endpoint, and a 'roi_proof' object including a compression_ratio_pct value (e.g. 91.4%) indicating token efficiency. Confirms whether the endpoint is indexed, live, and callable.","failureModes":["URL not indexed in the broker returns empty data or 404-equivalent status","Invalid or missing 'url' query parameter causes schema validation failure","Endpoint is indexed but currently offline returns degraded status","Unsupported HTTP method value returns enum validation error","Payment of $0.01 USDC not fulfilled causes 402 Payment Required response"],"whenToPreferThis":"Choose this endpoint when an AI agent needs to verify, discover, or preflight a specific MCP server, x402 API, or A2A agent URL before committing to a call — especially when quality scoring (TDQS), token compression metadata, or cross-protocol routing (x402 v2, IETF MPP, L402) information is needed. Prefer this over direct tool calls when you want to confirm a capability is live and indexed without side effects.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-27T12:59:44.773Z","isFirstParty":false,"canonicalSlug":"x402-broker-preflight-mcp-a2a-x402-meta-router-capability-check-557ebe77"}