# 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 2026-10-23).

Searches an index of 500+ MCP servers and A2A tools by capability query, returning matching endpoints with token-compressed results and prompt-injection firewall protection.

## Facts

- Endpoint: POST https://onchain-risk.agentdiet.dev/v1/agent-router?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-9ef0ca81
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lvebbhfFcCpWQpBrsjrsP

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-9ef0ca81 -d '<json body>'
```

Example prompt: Search the agent router for MCP servers or A2A tools that handle 'SEC filings' and tell me which ones are available — I want to route my agent to the right endpoint.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP server or A2A tool supports a specific capability without hardcoding individual endpoints. Ideal for swarm architectures, meta-orchestrators, or any agent that needs to route tasks to specialized tools at runtime. Prefer this over manually querying individual MCP servers when the target capability is unknown upfront or when token efficiency matters.

## Known failure modes

- Empty or vague query string returns no relevant matches
- Queried endpoint URL is unreachable or not indexed
- Prompt-Guard firewall blocks a query it misidentifies as malicious
- Token budget exhausted due to large result sets without compression
- HTTP 402 payment required if x402 payment not included
- Idempotency key collision causes unexpected deduplication

## 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/agent-router)

## Output

Returns a compressed list of matching MCP servers and A2A tool endpoints relevant to the query, with up to 85% token compression, filtered through a Prompt-Guard firewall to prevent injection attacks. The response is a JSON object containing matched tools, their capabilities, and routing metadata.

## 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-9ef0ca81/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)