# 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).

Searches and routes queries across 500+ indexed MCP servers and A2A tools, returning token-compressed results through a Prompt-Guard firewall.

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/tool-broker?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-470b1fe6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5j0-1Liz_hfM8Zx7w265S

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-470b1fe6 -d '<json body>'
```

Example prompt: Search the MCP tool index for any servers that handle 'SEC filings' or 'company enrichment' — I need to find the right tool to route my agent query through.

## When to prefer this

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, rather than hardcoding tool endpoints. Ideal for swarm architectures where agents must self-route, or when you want a single authenticated connection to reach 500+ tools with built-in safety filtering and token compression.

## Known failure modes

- Empty or vague query returns no matches or low-relevance results
- Queried capability not indexed among the 500+ servers returns empty result set
- Prompt-Guard firewall may block queries that resemble injection attempts
- Payment failure via x402 results in 402 response and no tool results
- Unavailable upstream MCP servers may cause routing errors or partial results

## 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/tool-broker)

## Output

Returns a token-compressed (up to 85% reduction) list of matching MCP servers or A2A tools that satisfy the capability query, including endpoint metadata and routing information, filtered through a Prompt-Guard firewall to block prompt injection attempts.

## 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-470b1fe6/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)