# Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router

> Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router 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 and routes across 500+ indexed MCP servers and A2A tools via a single meta-router connection with token compression and prompt-injection firewall

## Facts

- Endpoint: GET https://mcp-compiler.agentdiet.dev/v1/mcp-router?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-ffc5d04f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_M5J7xjQlaTGicVN1EotnC

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-ffc5d04f
```

Example prompt: Search the MCP router index for tools that handle GitHub security audits — I need to find the best available MCP server for that capability.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP server or A2A tool supports a given capability at runtime, rather than hardcoding a specific tool. Especially useful for swarm architectures, tool marketplaces, or orchestrators that need to route tasks across a large and evolving catalog of agent tools with prompt-injection safety guarantees.

## Known failure modes

- Empty query string returns a validation error
- No matching tools found for an obscure or unsupported capability returns empty results
- Queried endpoint URL fails SLA or compliance checks and returns an error status
- Service unavailable if the meta-router index is down or overloaded
- x402 payment failure if the $0.01 microtransaction is not fulfilled

## 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/mcp-router)

## Output

Returns a list of matching MCP servers or A2A tools from the 500+ indexed catalog, including compressed capability descriptions, routing metadata, and firewall-screened endpoint references relevant to the search query or verified URL.

## 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-ffc5d04f/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)