# Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router (B2B OSINT DAG)

> Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router (B2B OSINT DAG) 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 an index of 500+ MCP servers and A2A agent tools by capability query, returning compressed, firewall-filtered routing results for agent swarms.

## Facts

- Endpoint: GET https://polymarket-odds.agentdiet.dev/v1/b2b-osint-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- 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-2832c711
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DnYjZUoZ65An5ACTIuFZr

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-2832c711
```

Example prompt: Search the MCP and A2A tool index for any available capabilities around 'SEC filings' — I need to find which servers or agent tools can pull regulatory filing data.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to delegate a task to, rather than hardcoding a specific tool. Useful for swarm orchestration, capability gap-filling, or when the required tool is unknown at design time. Prefer over manual tool registries when token efficiency and firewall safety are priorities.

## Known failure modes

- Empty query string returns validation error (query minLength:1 required)
- Query too vague returns zero or low-confidence matches
- Index may not include very new or unlisted MCP servers
- Prompt injection attempts blocked by Prompt-Guard firewall returning redacted or rejected results
- HTTP 402 payment required if x402 payment header not included
- Unrecognized endpoint URL passed for verification may return null or error result

## 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 a filtered, token-compressed list of matching MCP servers or A2A tools relevant to the query, including routing metadata, capability descriptions, and Prompt-Guard firewall verdicts for safe proxying.

## 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-2832c711/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)