# x402broker A2A Router

> x402broker A2A Router is a paid API for AI agents from x402broker.com, paid per call via x402 or MPP, $0.01/call, status unknown (last checked 2026-10-20).

Discovers and routes requests across 500+ MCP servers and A2A tools via a single meta-router connection with token compression and prompt injection protection.

## Facts

- Endpoint: GET https://x402broker.com/v1/a2a-router?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402, MPP
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402broker-a2a-router-f7413aa0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_w7QL0vOmdeAmNrVwQ0AG6

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 x402broker-a2a-router-f7413aa0
```

Example prompt: Search the x402broker A2A router for MCP tools that can help with SEC financial data extraction — I want to find the best available agent tool for that job in a single query.

## When to prefer this

Choose this endpoint when an agent needs to discover or route to one of hundreds of MCP servers or A2A tools without managing individual connections. Ideal for agent swarms or orchestrators that need dynamic tool discovery with low token overhead and built-in prompt injection protection, rather than hard-coding specific tool URLs.

## Known failure modes

- Query parameter missing or empty — returns 400 bad request
- No matching MCP servers or A2A tools found for the query — empty result set
- Prompt-Guard firewall blocks suspicious or injection-containing queries
- Rate limit or payment failure causes 402 response
- Upstream MCP server index unavailable — 503 service error

## 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://x402broker.com/v1/a2a-router)

## Output

Returns a list of matching MCP servers or A2A tool endpoints relevant to the query, including tool metadata, routing information, and compressed context to minimize token usage for the calling agent.

## 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/x402broker-a2a-router-f7413aa0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402broker.com](https://www.zero.xyz/host/x402broker.com/llms.txt)