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

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

## Facts

- Endpoint: GET https://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: agentdiet.dev
- Website: https://agentdiet.dev
- Canonical page: https://www.zero.xyz/c/agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-router-ab6f2f28
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5txdFiLwx7DVtte8XN8_A

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 agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-router-ab6f2f28
```

Example prompt: Search the agent tool marketplace for MCP servers or A2A tools that can handle SEC filings and company financial enrichment — I need to find what's available and get their endpoint details.

## When to prefer this

Choose this endpoint when you need to dynamically discover which MCP servers or A2A tools are available for a given capability without hardcoding individual endpoints. It is especially useful for agent orchestrators building swarms, developers who want a single connection point to 500+ tools, or when you need token-efficient tool descriptions with built-in prompt-injection protection before routing to third-party agents.

## Known failure modes

- Empty query string returns a validation error
- Query matches no indexed tools — returns empty result set
- Endpoint URL verification fails if URL is not in the index
- Service unavailable if the meta-router backend is down
- Payment required (HTTP 402) if $0.01 per-call fee is not fulfilled

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

## Output

Returns a list of matching MCP servers or A2A tool entries from the 500+ indexed catalog, with compressed metadata (85% token reduction) describing each tool's capabilities, endpoint URLs, and safety status after prompt-injection firewall screening.

## 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/agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-router-ab6f2f28/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdiet.dev](https://www.zero.xyz/host/agentdiet.dev/llms.txt)