# 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 an index of 500+ MCP servers and A2A tools by capability query, returning matched endpoints with compressed metadata and prompt-injection firewall protection.

## Facts

- Endpoint: GET https://polymarket-odds.agentdiet.dev/api/mcp/audit?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-63fc30cf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_42ijdbzPy05Nb3yMjwI2M

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-63fc30cf
```

Example prompt: Search the MCP tool index for servers that support SEC filings or company enrichment — I need to find the right tool to pull financial data for a research agent.

## When to prefer this

Use this endpoint when an AI agent needs to discover which MCP servers or A2A tools support a particular capability without manually cataloguing hundreds of servers. It is especially useful when building swarms or multi-agent pipelines that need dynamic tool routing, or when you want compressed tool metadata with built-in prompt-injection filtering rather than raw tool directories.

## Known failure modes

- Missing or empty 'query' parameter returns a 400 validation error
- Query too broad returns too many low-relevance results
- No matching tools found returns empty result set
- Upstream MCP index unavailable causes 502 or timeout
- Payment not included or failed results in HTTP 402 response

## 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/api/mcp/audit)

## Output

Returns a list of matching MCP server or A2A tool entries relevant to the capability query, with compressed metadata (85% token reduction) describing each tool's capabilities, endpoint details, and safety status as filtered by the Prompt-Guard firewall.

## 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-63fc30cf/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)