# 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 token-compressed results routed through a Prompt-Guard firewall

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/mesh?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-3fd94596
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KDgo67HSOFO9N947FgiLI

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-3fd94596 -d '<json body>'
```

Example prompt: Search the MCP tool mesh for any indexed servers or A2A tools that handle SEC filings or company enrichment — I want to find what's available without setting up individual connections.

## When to prefer this

Choose this endpoint when an agent needs to discover and route to one of 500+ MCP or A2A tools without managing individual server connections, especially when token efficiency and prompt security (firewall) are priorities. Prefer over direct tool integration when the target capability is unknown or when building multi-agent swarms that need dynamic tool resolution.

## Known failure modes

- Empty or vague query returns no results or irrelevant matches
- Queried endpoint URL not found in the mesh index
- Mesh index temporarily unavailable (500 error)
- x402 payment not included or rejected, returning 402 response
- Query too short (minLength:1 violated) returns validation error
- Rate limiting if too many queries in rapid succession

## 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/mesh)

## Output

Returns a compressed, token-pruned list of matched MCP servers and A2A tools relevant to the capability query, including metadata about each tool, routing info, and Prompt-Guard firewall status — all delivered through a single connection.

## 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-3fd94596/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)