# 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 2026-10-23).

Searches a meta-index of 500+ MCP servers and A2A tools by capability query, returning matching tool endpoints with token-compressed results and prompt-injection firewall protection.

## Facts

- Endpoint: POST https://polymarket-odds.agentdiet.dev/v1/tool-search?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-22d66f31
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_677nmKya_oLinOLq8y21v

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-22d66f31 -d '<json body>'
```

Example prompt: Search the MCP tool index for any servers that handle 'SEC filings' or 'company enrichment' — I need to find the right tool endpoint for my agent pipeline.

## When to prefer this

Use this endpoint when an AI agent or orchestration layer needs to dynamically discover which MCP server or A2A tool handles a specific capability at runtime, rather than hard-coding tool endpoints. Ideal for swarm architectures, meta-agents, or systems that need to route tasks to the best available tool without prior knowledge of the full tool registry.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for niche or misspelled capability query returns empty result set
- Unrecognized endpoint URL passed for verification returns not-found response
- Prompt-Guard firewall may block queries containing injection-like patterns
- Rate limiting or 402 payment required if credits exhausted

## 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/tool-search)

## Output

Returns a list of matching MCP server or A2A tool entries from the 500+ tool index, with 85% token-compressed metadata describing each tool's capabilities, endpoint URLs, and relevant parameters — filtered through a Prompt-Guard firewall to prevent prompt injection attacks.

## 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-22d66f31/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)