# 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 a meta-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://polymarket-odds.agentdiet.dev/v1/crypto-alpha-dag?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-278a3a11
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MY9T7vkGZ91erJep7W0v6

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-278a3a11
```

Example prompt: Search the MCP tool index for servers that handle SEC filings and company enrichment — I want to see what's available with compressed results.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools exist for a given capability, rather than hardcoding a specific tool. Especially useful when building swarm orchestrators or agent pipelines that need to route tasks to the best available tool at runtime. Prefer this over manual tool registries when you need token-efficient results across a large catalog of 500+ servers.

## Known failure modes

- Empty or too-broad query returns low-relevance results
- Queried endpoint URL is unreachable or non-compliant, returning an error or failed verification
- Index may not include newly registered MCP servers if not yet indexed
- Prompt injection attempts in query are blocked by firewall and may return a rejection response
- Payment not completed (HTTP 402) blocks access to results

## 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/crypto-alpha-dag)

## Output

Returns a list of matching MCP servers or A2A tools relevant to the capability query, with token-compressed descriptions (up to 85% compression), safety-filtered through a Prompt-Guard firewall, and optionally a verification result if an endpoint URL was provided.

## 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-278a3a11/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)