# 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 via a single connection.

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/broker/execute?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-5fd1cdae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1PrjI5CoeyknZ2m_tYWY-

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-5fd1cdae -d '<json body>'
```

Example prompt: Search the MCP tool index for servers that can handle 'SEC filings' — I need to find the right tool for my agent to pull company financial data, and make sure whatever comes back is firewall-cleared and token-compressed.

## 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, especially in multi-agent swarm architectures where routing decisions must be made programmatically. Prefer this over hardcoded tool lists when the capability landscape changes frequently or when safety filtering (Prompt-Guard) is required before proxying to third-party tools. It is ideal for orchestrators that need a single connection point to 500+ tools with token-budget constraints.

## Known failure modes

- Empty query string returns 400 validation error
- No matching tools found returns empty results object
- Firewall blocks malicious or prompt-injection-containing queries
- Downstream MCP server unavailable causes partial results
- x402 payment failure prevents execution
- Overly broad query returns too many low-relevance 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/broker/execute)

## Output

Returns a compressed (up to 85% token reduction) list of matching MCP servers or A2A tools from the 500+ item index, filtered through the Prompt-Guard firewall. Each result includes tool descriptors, capability summaries, and routing metadata sufficient for an agent to select and invoke the appropriate downstream tool.

## 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-5fd1cdae/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)