# 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 mesh.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches a curated index of 500+ MCP servers and A2A tools by capability query, returning token-compressed results with prompt-injection firewall protection.

## Facts

- Endpoint: GET https://mesh.agentdiet.dev/v1/agent-tool-marketplace?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mesh.agentdiet.dev
- Website: https://mesh.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-ae268b00
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fyyeRbYXUjqSJhTUqA4cQ

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 mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-ae268b00
```

Example prompt: Search the agent tool marketplace for MCP servers and A2A tools that handle 'SEC filings' and show me the top matches with token-compressed summaries.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools support a given capability at runtime, especially in swarm or orchestrator architectures where tool availability must be checked programmatically. Prefer it over hardcoded tool registries when you need live index coverage of 500+ servers with built-in prompt-injection safety screening and token-efficient responses.

## Known failure modes

- Empty query string returns validation error (query is required, minLength 1)
- No matching tools found for highly specific or niche queries
- Endpoint URL verification may return unverified if the URL is not indexed
- Payment required (HTTP 402) if x402 micropayment not attached or fails
- Rate limiting if query volume exceeds plan limits

## 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://mesh.agentdiet.dev/v1/agent-tool-marketplace)

## Output

Returns a token-compressed list of matching MCP servers or A2A tools relevant to the search query, including capability descriptions, endpoint metadata, and safety/firewall status, with up to 85% reduction in token overhead compared to raw results.

## 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/mesh-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-ae268b00/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mesh.agentdiet.dev](https://www.zero.xyz/host/mesh.agentdiet.dev/llms.txt)