# 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 filtered through a prompt-injection firewall.

## Facts

- Endpoint: GET https://onchain-risk.agentdiet.dev/v1/mesh/dispatch?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-89317326
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7FHnJOrTu4h8si1vsb4x5

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-89317326
```

Example prompt: Search the MCP tool mesh for any servers that handle SEC filings retrieval — I need to find the right endpoint to wire into my agent pipeline.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP server or A2A tool to call for a given capability, rather than hard-coding tool URLs. Especially useful for swarm architectures where the right downstream tool is not known at build time, or when you want firewall-filtered, token-efficient tool routing in a single call.

## Known failure modes

- No matching tools found for the query — empty result set returned
- Query string too vague, returning low-relevance or overly broad tool matches
- Provided endpoint URL is unreachable or non-compliant, validation fails
- Rate limiting or payment failure via x402 returns 402 status
- Firewall flags the query itself as potentially adversarial and blocks it

## 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/mesh/dispatch)

## Output

A token-compressed (up to 85% reduction) list of matching MCP servers or A2A tools from a 500+ entry index, with metadata about each tool's capabilities. Results have been screened by a Prompt-Guard firewall to filter prompt-injection risks before delivery.

## 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-89317326/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)