# 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 serp-extract.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-23).

Meta-router that searches and proxies 500+ MCP servers and A2A tools via a single connection, with 85% token compression and a Prompt-Guard firewall.

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/workflows?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: serp-extract.agentdiet.dev
- Website: https://serp-extract.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/serp-extract-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-78e81a3e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NV3KXfJ7IofZmRI7LvjCA

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 serp-extract-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-78e81a3e -d '<json body>'
```

Example prompt: Search across 500+ MCP servers and A2A tools for anything that can do 'SEC filings retrieval' and return the best matching endpoints with compressed metadata.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to delegate a task to, rather than hardcoding a specific tool. Ideal for swarm architectures, meta-agents, or orchestrators that need runtime tool selection with safe proxy guarantees and token-efficient responses.

## Known failure modes

- Empty or too-broad query returns low-relevance results
- Queried capability not indexed among 500+ servers returns empty results
- Malicious prompt injection blocked by Prompt-Guard firewall with rejection notice
- Payment not processed (HTTP 402) blocks execution
- Timeout if downstream MCP servers are slow to respond

## 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://serp-extract.agentdiet.dev/v1/workflows)

## Output

A compressed, token-pruned list of matching MCP servers and A2A tools relevant to the capability query, including endpoint metadata, tool descriptions, and routing information, filtered through a Prompt-Guard firewall.

## 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/serp-extract-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-78e81a3e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from serp-extract.agentdiet.dev](https://www.zero.xyz/host/serp-extract.agentdiet.dev/llms.txt)