# 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 a meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-filtered results for agent routing and swarm orchestration.

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/broker/catalog?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-8b9f6717
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OA_KJv3rT0wvynQMWyC9M

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-8b9f6717 -d '<json body>'
```

Example prompt: Search the MCP and A2A tool catalog for any servers that handle 'company enrichment' or 'B2B lead generation' — I want to see what's available so I can route my agent swarm to the right tool.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability before routing tasks, especially in swarm or orchestration scenarios where the right downstream tool is not known in advance. Prefer over manual tool registries when you need compressed, firewall-sanitized results across 500+ indexed servers in a single call.

## Known failure modes

- Query string is empty or too vague — returns no relevant matches
- No indexed tools match the capability query — empty result set
- Payment not processed (x402) — request rejected with 402 status
- Rate limit exceeded — request throttled or rejected
- Endpoint URL provided for verification does not match any indexed entry

## 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/broker/catalog)

## Output

A compressed, Prompt-Guard-filtered list of matching MCP servers and A2A tools from the 500+ item index, including tool metadata, endpoint references, and capability summaries — delivered with up to 85% token compression for efficient agent consumption.

## 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-8b9f6717/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)