# 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 mcp-compiler.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 via a single meta-router connection.

## Facts

- Endpoint: GET https://mcp-compiler.agentdiet.dev/v1/broker/catalog?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mcp-compiler.agentdiet.dev
- Website: https://mcp-compiler.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mcp-compiler-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-f7959fc6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_B-fcxAd2tAOk66yh82uJN

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability mcp-compiler-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-f7959fc6
```

Example prompt: Search the MCP broker catalog for tools that can do SEC filings analysis — I want to find which servers in the index support that capability.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover new tools or MCP servers by capability at runtime, especially when the target tool is not already known. Useful for swarm orchestration, capability routing, and situations where token budget is a concern due to the 85% compression claim.

## Known failure modes

- Query string missing or empty — returns 400 bad request
- No matching tools found for the query — returns empty result set
- Payment not provided or insufficient — HTTP 402 payment required
- Catalog index temporarily unavailable — returns 503
- Query too vague to return meaningful results — broad or unfiltered matches

## 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://mcp-compiler.agentdiet.dev/v1/broker/catalog)

## Output

Returns a catalog of matching MCP servers and A2A tools relevant to the search query, with token-compressed metadata including endpoint URLs, capability descriptions, and routing information for swarm or single-agent use.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "query"
 ],
 "properties": {
  "query": {
   "type": "string",
   "minLength": 1,
   "description": "Capability search query (e.g. 'context compression', 'github security', 'sec filings', 'company enrichment') or endpoint URL to verify"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mcp-compiler-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-f7959fc6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-compiler.agentdiet.dev](https://www.zero.xyz/host/mcp-compiler.agentdiet.dev/llms.txt)