# 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 an index of 500+ MCP servers and A2A tools by capability query, returning token-compressed results via a single-connection meta-router with a Prompt-Guard firewall.

## Facts

- Endpoint: GET https://onchain-risk.agentdiet.dev/v1/x402-gateway?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-62fbc386
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dV5h-0ZE5FHPkpMvpCeWD

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-62fbc386
```

Example prompt: Search the MCP tool index for 'SEC filings' and show me which servers and A2A tools are available for that capability.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools support a given capability without hardcoding individual integrations. It is especially valuable when building swarm-style agent pipelines that need to route to the best available tool at runtime, or when token budget is constrained and the 85% compression is beneficial. Prefer it over direct MCP server queries when the target tool is unknown and a broad capability search is needed.

## Known failure modes

- Empty or vague query returns no meaningful matches
- Query too broad returns unranked noise across 500+ tools
- Prompt-Guard firewall blocks queries it misclassifies as injection attempts
- Endpoint URL verification queries may time out if the remote server is unreachable
- x402 payment failure halts the request before results are returned

## 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/x402-gateway)

## Output

Returns a filtered, token-compressed list of matching MCP servers and A2A tools relevant to the capability query, including endpoint identifiers, descriptions, and routing metadata — all passed through the Prompt-Guard firewall to block injection attempts.

## 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-62fbc386/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)