# 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 2026-10-28).

Meta-router that searches and proxies 500+ MCP servers and A2A tools with token compression and prompt-injection firewall, returning the best-matching tools for a capability query.

## Facts

- Endpoint: POST https://polymarket-odds.agentdiet.dev/v1/mcp-gateway?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-28
- 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-f63ef69d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tb00k0CVv7q-vdnyKonRQ

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-f63ef69d -d '<json body>'
```

Example prompt: Search the MCP tool index for any servers that handle SEC filings or company enrichment and route me to the best match — I need something that can pull 10-K reports for a public company.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool handles a given capability without maintaining its own index. Prefer it over hardcoded tool registries when the ecosystem is large or frequently changing. Its 85% token compression and built-in Prompt-Guard firewall make it especially valuable for cost-sensitive or safety-critical agent pipelines.

## Known failure modes

- Query string is empty or too vague — returns no matches or low-confidence results
- Queried capability not indexed among the 500+ servers — empty result set
- Payment not settled via x402/MPP — 402 Payment Required error
- Firewall blocks a suspicious query flagged as prompt injection — request rejected
- Upstream MCP server unavailable during proxy routing — partial or error 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/v1/mcp-gateway)

## Output

Returns a structured object listing matching MCP servers or A2A tools for the queried capability, including routing metadata and compressed tool descriptions filtered through a 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-f63ef69d/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)