# X402-BROKER Guard Endpoint

> X402-BROKER Guard Endpoint is a paid API for AI agents from x402broker.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-27).

Routes a text query through the X402-BROKER meta-router, returning structured agent-ready data with ROI compression proof across 7,340+ indexed capabilities.

## Facts

- Endpoint: GET https://x402broker.com/v1/guard?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-27
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-broker-guard-endpoint-69acd2a0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Cqa60cRSoWD5g3HInsXKN

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 x402-broker-guard-endpoint-69acd2a0
```

Example prompt: Search across all indexed MCP servers and x402 APIs for tools that can help me validate an email address, then return the best result — use the guard endpoint with a GET request and pass my query as text.

## When to prefer this

Choose this endpoint when you need to dynamically discover and invoke one of thousands of live capabilities without knowing the specific API in advance — it acts as a universal meta-router. Prefer it over direct API calls when the right tool is unknown, when you want TDQS quality-scored routing, or when you need a single x402 micropayment interface to access MCP servers, A2A agents, and x402 APIs simultaneously.

## Known failure modes

- Missing required 'input' object or 'type'/'method' fields returns a schema validation error
- Payment failure or insufficient USDC balance results in 402 Payment Required response
- No matching capability found for query text returns empty or null data object
- Invalid HTTP method enum value (not GET or POST) causes request rejection
- Upstream MCP server or x402 API unavailability may return partial or error data

## How this service works

Universal B2A/A2A/MCP Meta-Router & Autonomous Tool Marketplace indexing 7,340+ live capabilities across x402 v2 (5-chain EVM USDC), IETF MPP, and L402 with TDQS quality scoring and zero-fee pass-through execution.

## Output

Returns a JSON object with a 'status' field ('ok'), a 'data' object containing the routed capability's response, and an 'roi_proof' object including a compression_ratio_pct value (e.g. 91.4%) indicating how efficiently the meta-router distilled the result.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "POST"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "text": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {},
  "status": "ok",
  "roi_proof": {
   "compression_ratio_pct": 91.4
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-broker-guard-endpoint-69acd2a0/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)