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

Searches and routes to 500+ MCP servers and A2A tools via a single meta-router endpoint with prompt-guard firewall and token compression

## Facts

- Endpoint: GET https://polymarket-odds.agentdiet.dev/v1/tool-broker?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: polymarket-odds.agentdiet.dev
- Website: https://polymarket-odds.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/polymarket-odds-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-dc232b7c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3lT8sOr5kyqiA7V5C9HdE

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 polymarket-odds-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-dc232b7c
```

Example prompt: Search the MCP tool broker for any servers or A2A tools that handle SEC filings and company enrichment — I want to find the best available capability in a single query.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP server or A2A tool to invoke for a capability it doesn't already know, especially when operating across a large heterogeneous tool ecosystem. Prefer it over hardcoded tool registries when the target capability may be served by multiple providers and you want a single normalized search interface with built-in safety filtering.

## Known failure modes

- Query too vague — returns low-relevance or empty results
- Queried capability not indexed among the 500+ servers — no match found
- Endpoint URL verification fails if the target server is offline
- Rate limiting or payment failure if x402 micropayment not processed
- Response schema is generic object — no guaranteed structure on tool metadata

## 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://polymarket-odds.agentdiet.dev/v1/tool-broker)

## Output

Returns a list of matching MCP servers or A2A tools ranked by relevance to the query, including capability metadata, endpoint URLs, and compressed tool manifests with Prompt-Guard firewall applied to filter unsafe content.

## 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/polymarket-odds-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-dc232b7c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from polymarket-odds.agentdiet.dev](https://www.zero.xyz/host/polymarket-odds.agentdiet.dev/llms.txt)