# X402-BROKER MCP Gateway Search

> X402-BROKER MCP Gateway Search is a paid API for AI agents from x402broker.com, paid per call via x402 or MPP, $0.01/call, status unknown (last checked 2026-10-27).

Search and discover live MCP servers, x402 APIs, and A2A agents across a meta-index of 31,000+ capabilities via a single query

## Facts

- Endpoint: GET https://x402broker.com/v1/mcp-gateway?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402, MPP
- Status: unknown
- Last checked: 2026-10-27
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-broker-mcp-gateway-search-9ad1e2ce
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pCCOJ6PkxNJqsfr3BRAYD

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-mcp-gateway-search-9ad1e2ce
```

Example prompt: Search the X402-BROKER gateway for up to 20 MCP servers or APIs related to 'context compression' so I can find the best tool to compress my agent's token usage.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which MCP servers, x402 APIs, or A2A agents exist for a given capability, rather than hard-coding tool endpoints. It is especially useful for building agent orchestration layers, tool marketplaces, or routing logic that must select from thousands of available tools at runtime. Prefer this over manually maintaining a list of APIs or using a narrower single-provider registry.

## Known failure modes

- Empty query string — returns validation error since query is required and minLength is 1
- No matching results for obscure or misspelled capability queries — returns empty result set
- Limit out of range (below 1 or above 100) — returns schema validation error
- Invalid pagination cursor — returns error or restarts from beginning
- Gateway may return stale index data if upstream MCP servers have gone offline

## 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

A paginated list of matching MCP servers, x402 APIs, or A2A agent tools with their metadata (names, descriptions, endpoint URLs, pricing, tags), plus an opaque pagination cursor for fetching additional results.

## 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": {
      "query": {
       "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-mcp-gateway-search-9ad1e2ce/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)