# 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 and routes queries across 500+ indexed MCP servers and A2A tools via a single connection, with token compression and prompt-guard firewall.

## Facts

- Endpoint: POST https://polymarket-odds.agentdiet.dev/v1/b2b-osint-dag?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-48ee5d81
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uNcSxrYOnbSExuOBo2zay

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-48ee5d81 -d '<json body>'
```

Example prompt: Search the MCP and A2A tool index for servers that can handle 'SEC filings extraction' and return the best matching endpoints with compressed metadata.

## When to prefer this

Choose this endpoint when you need to discover or route to MCP servers or A2A tools from a large indexed registry in a single connection, especially when token budget is a concern (85% compression) or when you need a safe proxy that guards against prompt injection from untrusted upstream tools. Prefer over manual MCP server enumeration or direct multi-connection swarm setups.

## Known failure modes

- Empty or too-vague query string returns no matches or overly broad results
- No indexed servers match the requested capability, returning an empty result set
- Prompt-Guard firewall may block or sanitize certain query patterns flagged as injection attempts
- Downstream MCP server unavailable causing routing failure
- Malformed query (minLength not met) returns a 400 validation error
- Payment not satisfied returns HTTP 402 with x402 payment challenge

## 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/b2b-osint-dag)

## Output

Returns metadata about matching MCP servers or A2A tools including endpoint details, capability descriptions, and token-compressed responses; protected by a Prompt-Guard firewall to prevent prompt injection from upstream tools.

## 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-48ee5d81/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)