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Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router — Broker Catalog
Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router — Broker Catalog is a paid API for AI agents from x402-audit.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).
Searches an index of 500+ MCP servers and A2A tools by capability query, returning matching endpoints with token-compressed metadata and prompt-guard filtering.
Price / call$0.01
Success—
StatusUnknown
How this service works
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://x402-audit.agentdiet.dev/v1/broker/catalog)
Output
A catalog response listing matching MCP servers or A2A tools filtered by the query, with 85% token-compressed metadata about each endpoint's capabilities, likely including names, descriptions, URLs, and capability tags. Responses pass through a Prompt-Guard firewall before delivery.
Example use cases
Discover tools for GitHub security audits
“Search the MCP tool catalog for anything that can do GitHub security auditing or code scanning — I want to find available agent tools I can route tasks to.”
Find context compression MCP servers
“Look through the broker catalog for MCP servers that support context compression — I'm trying to reduce token usage in my agent pipeline.”
Locate domain OSINT and email verification tools
“Can you query the tool index for agents or MCP endpoints that do domain OSINT or email verification? I need to know what's available before I build my enrichment workflow.”
Technical details
Endpoint
GEThttps://x402-audit.agentdiet.dev/v1/broker/catalog?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool is best suited for a given capability at runtime, especially when the agent doesn't have a hardcoded tool registry. It is particularly useful when building swarm architectures or meta-agents that delegate tasks across many specialized tools, and when token budget is a concern (85% compression). Prefer it over maintaining a static tool list or manually curating integrations.
Side effects
- Empty result set if query terms do not match any indexed tool
- 402 Payment Required if the $0.01 USDC payment header is missing or invalid
- Malformed or vague queries returning low-relevance results
- Firewall may redact or block results flagged as potentially unsafe
- Index may be stale if underlying MCP servers have changed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| queryrequired | string | Capability search query (e.g. 'context compression', 'github security', 'sec filings', 'company enrichment') or endpoint URL to verify |
Output
Schema · Response
{
"type": "object"
}Reviews
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Zero review prompt (fires after every successful call)
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