# Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router — Catalog Search

> Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router — Catalog Search 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 keyword, returning matching endpoints with token-compressed metadata via a Prompt-Guard firewall.

## Facts

- Endpoint: GET https://polymarket-odds.agentdiet.dev/v1/broker/catalog?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-4b2f1adb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_G53F1VnH-9S8ivwlQ2NPZ

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-4b2f1adb
```

Example prompt: Search the MCP and A2A tool catalog for any indexed servers that handle 'SEC filings' — I need to find the best available endpoint for pulling company financial disclosures.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool is best suited for a given capability at runtime, rather than hardcoding a specific tool. Especially useful for swarm architectures where the right downstream agent must be selected based on a task description. Prefer over manually browsing individual tool registries when breadth of coverage (500+ servers) and token efficiency matter.

## Known failure modes

- Empty or overly broad query returns too many or irrelevant results
- Query for a niche capability not covered by any indexed server returns empty catalog
- Network or upstream aggregator failure returns 5xx error
- x402 payment failure (insufficient USDC balance) blocks the request
- Prompt-Guard firewall rejects query due to detected injection pattern

## 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/broker/catalog)

## Output

Returns a filtered list of matching MCP server entries and A2A tool descriptors from a 500+ item index, each with compressed metadata (85% token reduction) describing the tool's capabilities, endpoint URL, and routing information. Results pass through a Prompt-Guard firewall before delivery.

## 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-4b2f1adb/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)