mcpgatewayarchitecture

MCP Search Gateway: Multi-Provider Pattern 2026

Route agent search through a single MCP gateway that handles failover, load balancing, and provider selection. One config for all agents, automatic fallback.

May 21, 2026

8 min

The MCP search gateway pattern routes agent search requests through a single MCP interface that dispatches to multiple providers based on query type, cost, and availability. Instead of wiring each agent to a specific search API, the gateway handles failover, load balancing, and provider selection automatically.

Why a gateway matters

Single MCP config for all agents -- swap providers without touching agent code
Automatic failover when one provider is down or rate-limited
Route by query type: web search to one provider, product search to another
Centralized cost tracking and budget caps

Gateway architecture

Python

import requests
from typing import Optional

class SearchGateway:
    """Route search queries to the best provider."""

    def __init__(self):
        self.providers = {
            "web": {
                "url": "https://api.scavio.dev/api/v1/search",
                "headers": {"x-api-key": "YOUR_KEY"},
                "cost_per_query": 0.005
            },
            "product": {
                "url": "https://api.scavio.dev/api/v1/search",
                "headers": {"x-api-key": "YOUR_KEY"},
                "cost_per_query": 0.005
            }
        }
        self.budget_remaining = 30.0  # monthly budget

    def search(self, query: str, platform: str = "google",
               num_results: int = 5) -> Optional[dict]:
        provider = self.providers.get("web")
        if self.budget_remaining <= 0:
            return {"error": "Budget exhausted"}

        resp = requests.post(
            provider["url"],
            headers=provider["headers"],
            json={
                "query": query,
                "platform": platform,
                "num_results": num_results
            }
        )

        if resp.status_code == 200:
            self.budget_remaining -= provider["cost_per_query"]
            return resp.json()

        # Failover logic would go here
        return {"error": f"Provider returned {resp.status_code}"}

gateway = SearchGateway()
results = gateway.search("best database for AI agents 2026")
print(f"Budget remaining: ${gateway.budget_remaining:.2f}")

MCP config for the gateway

JSON

{
  "mcpServers": {
    "search-gateway": {
      "url": "https://mcp.scavio.dev/mcp",
      "headers": {
        "x-api-key": "YOUR_KEY"
      }
    }
  }
}

Multi-provider routing in JavaScript

JavaScript

// Route queries to the cheapest available provider
const providers = [
  {
    name: "scavio",
    url: "https://api.scavio.dev/api/v1/search",
    costPer: 0.005,
    platforms: ["google", "youtube", "amazon", "reddit", "tiktok"]
  }
];

async function gatewaySearch(query, platform = "google") {
  const provider = providers.find(p => p.platforms.includes(platform));
  if (!provider) throw new Error("No provider for platform: " + platform);

  const resp = await fetch(provider.url, {
    method: "POST",
    headers: {
      "x-api-key": process.env.SCAVIO_KEY,
      "Content-Type": "application/json"
    },
    body: JSON.stringify({ query, platform, num_results: 5 })
  });

  if (!resp.ok) throw new Error("Search failed: " + resp.status);
  return resp.json();
}

// Usage: one function, any platform
const webResults = await gatewaySearch("AI agent frameworks 2026");
const productResults = await gatewaySearch("wireless earbuds", "amazon");

When to use this pattern

Multiple agents sharing a search budget
Different query types needing different providers
Production systems requiring failover guarantees
Teams wanting centralized cost tracking

When it is overkill

Single-agent setups with one provider and low volume. Just point the MCP config directly at your search API. Add the gateway layer when you hit multi-agent or multi-provider complexity.