# 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 across 500+ MCP servers and A2A tools via a single connection, with token compression and prompt firewall protection

## Facts

- Endpoint: GET https://polymarket-odds.agentdiet.dev/v1/web-rag-shield-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-8f59b74f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JmqY4Pypi9EKpBHiaahFQ

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-8f59b74f
```

Example prompt: Search the MCP and A2A tool index for anything that can handle 'SEC filings' or 'company enrichment' — I want to see what servers are available and route through the safe proxy.

## When to prefer this

Choose this endpoint when an AI agent needs to discover which MCP servers or A2A tools are available for a given capability without connecting to each server individually. It is especially useful when token budget is a concern (85% compression), when security against prompt injection is required (Prompt-Guard firewall), or when you want a single-connection router rather than managing many separate MCP connections.

## Known failure modes

- Query string too vague returns low-relevance or empty tool matches
- Endpoint URL verification may fail if remote server is down or non-compliant
- Token compression may lose nuance for complex capability queries
- Prompt-Guard firewall may block legitimate queries that resemble injection patterns
- HTTP 402 payment required if payment not attached

## 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/web-rag-shield-dag)

## Output

A structured list of matching MCP servers or A2A tools relevant to the query, with token-compressed summaries (up to 85% reduction) and prompt-guard-filtered responses. Results include tool names, capabilities, and routing information for connecting to the matched endpoints.

## 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-8f59b74f/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)