# AgentDiet MCP Gateway (X402-BROKER)

> AgentDiet MCP Gateway (X402-BROKER) is a paid API for AI agents from mcp-gateway.agentdiet.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Routes agent queries across 31,390+ MCP servers, x402 APIs, and A2A agents, returning compressed intelligence results settled in USDC on Base via x402.

## Facts

- Endpoint: GET https://mcp-gateway.agentdiet.dev/v1/mcp-gateway?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentdiet-mcp-gateway-x402-broker-dc61ad6d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SouOcfCgFPV7umgE8ifUU

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 agentdiet-mcp-gateway-x402-broker-dc61ad6d
```

Example prompt: Search the MCP gateway for a tool that can summarize web pages — run a GET query with the search term 'web page summarizer' and settle the $0.01 USDC call on Base.

## When to prefer this

Choose this endpoint when you need a single brokered entry point into a massive catalog of MCP servers, x402 APIs, and A2A agents without integrating each individually. It is ideal for agents that need to discover and call capabilities dynamically, settle payments in USDC on Base atomically, and want compressed high-signal responses with ROI proof. Prefer alternatives if you need a free, unauthenticated, or non-crypto-payment-based API gateway.

## Known failure modes

- Payment failure if USDC balance is insufficient or Base transaction fails
- Invalid input type (must be 'http') returns schema validation error
- Unsupported method returns enum error
- No matching MCP server found for query returns empty data
- Gateway timeout if downstream MCP server is unresponsive
- Malformed queryParams returns parsing error

## How this service works

Deterministic B2A/A2A/MCP/x402/MPP/L402 execution and intelligence node at https://mcp-gateway.agentdiet.dev settling in USDC on Base.

## Output

A JSON object with a `data` field containing the brokered response, a `status` field (e.g. 'ok'), and a `roi_proof` object showing the compression ratio percentage (e.g. 91.4%), indicating how much intelligence was packed into the response relative to raw data.

## 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/agentdiet-mcp-gateway-x402-broker-dc61ad6d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-gateway.agentdiet.dev](https://www.zero.xyz/host/mcp-gateway.agentdiet.dev/llms.txt)