# 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 onchain-risk.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 to find the right agent capability by query, routing requests through a token-compressed, prompt-firewall-protected proxy.

## Facts

- Endpoint: GET https://onchain-risk.agentdiet.dev/v1/swarm-router?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: onchain-risk.agentdiet.dev
- Website: https://onchain-risk.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/onchain-risk-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-f979a105
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PEXFb-ymzSxDQGv5FNMdw

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 onchain-risk-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-f979a105
```

Example prompt: Search the swarm router index for any MCP or A2A tool that handles SEC filings and company enrichment — I need to find the right agent capability to route this task to.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to use for a given capability at runtime, rather than hard-coding a specific tool. Ideal for multi-agent orchestration, swarm routing, and scenarios where the right downstream tool is unknown ahead of time. The 85% token compression makes it especially valuable when operating under tight context budgets.

## Known failure modes

- Empty or too-generic query returns no matching tools
- Queried endpoint URL not found in index — returns empty or not-found result
- Malformed query string causes 400 validation error
- x402 payment not satisfied — returns HTTP 402 requiring USDC payment
- Rate limit or SLA exceeded — returns 429 or 503
- Index out of date — recently added MCP servers may not appear

## 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://onchain-risk.agentdiet.dev/v1/swarm-router)

## Output

Returns a structured object describing matching MCP servers or A2A tools from the 500+ indexed registry, including tool metadata with 85% token-compressed descriptions and routing information, filtered through the Prompt-Guard firewall.

## 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/onchain-risk-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-f979a105/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from onchain-risk.agentdiet.dev](https://www.zero.xyz/host/onchain-risk.agentdiet.dev/llms.txt)