{"uid":"cap_TIlNPd-VjstM5RsCKOBs2","slug":"serp-extract-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-c0fb2541","name":"Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router","description":"Single-connection meta-router indexing 500+ MCP servers & A2A tools with 85% token compression and Prompt-Guard firewall. (Live x402 v2, IETF MPP & MCP endpoint at https://serp-extract.agentdiet.dev/v1/agent-tool-marketplace)","url":"https://serp-extract.agentdiet.dev/v1/agent-tool-marketplace?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","required":["query"],"properties":{"limit":{"type":"integer","default":20,"maximum":100,"minimum":1,"description":"Maximum number of items to return per page (1-100)"},"query":{"type":"string","minLength":1,"description":"Capability search query (e.g. 'context compression', 'github security', 'sec filings', 'company enrichment') or endpoint URL to verify"},"cursor":{"type":"string","description":"Opaque pagination cursor for fetching the next page"}}},"responseSchema":{"type":"object"},"example":null,"exampleRequest":null,"tags":[],"displayCostAmount":"0.01","displayCostAsset":"USD","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":"mpp","network":"tempo","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_CaoY4F8ARtZo7qLaXnq3t","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":"serp-extract.agentdiet.dev","brandSlug":"serp-extract-agentdiet-dev-mpp","brandBaseUrl":"https://serp-extract.agentdiet.dev","brandDocsUrl":null,"whatItDoes":"Searches a meta-index of 500+ MCP servers and A2A tools by capability query, returning token-compressed results with prompt-injection firewall protection.","exampleAgentPrompt":"Search the A2A and MCP tool marketplace for any servers or agent tools that can handle SEC filings and company enrichment — I want the best matches with compressed results.","exampleUseCases":[{"title":"Discover MCP servers for code security","prompt":"I'm building an agent pipeline and need to find MCP servers or A2A tools that can audit GitHub repos for supply-chain vulnerabilities — search the marketplace and show me the top matches."},{"title":"Verify an existing agent endpoint","prompt":"Can you check whether this endpoint URL is a valid, compliant MCP or A2A tool and what capabilities it exposes: https://example-agent.dev/v1/tool?"},{"title":"Bootstrap a swarm with enrichment tools","prompt":"I'm setting up an autonomous agent swarm and need tools for B2B lead enrichment and domain OSINT — search the marketplace for the best available MCP servers covering those capabilities."}],"resultDescription":"Returns a list of matching MCP servers or A2A tools ranked by relevance to the query, with token-compressed metadata (85% compression), capability descriptions, endpoint URLs, and prompt-injection safety signals from the Prompt-Guard firewall.","failureModes":["Empty or too-broad query returns low-relevance or no results","Queried endpoint URL is unreachable or non-compliant, returning a validation error","Payment not fulfilled (HTTP 402) when x402 micropayment header is absent or malformed","Query string too short (minLength:1 not met) causes schema validation error","Marketplace index may not reflect newly added MCP servers not yet crawled"],"whenToPreferThis":"Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools support a given capability at runtime, rather than hardcoding tool URLs. It is especially useful for swarm orchestrators, agent-builder pipelines, and meta-agents that need to route sub-tasks to the most appropriate specialized tool without maintaining a static registry.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:23:15.715Z","isFirstParty":false,"canonicalSlug":"serp-extract-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-8d70db86"}