How to Use the Correios API (REST) MCP in Vercel AI SDK

Q: How does this setup handle Brazilian tracking number data privacy?

Every tracking code and postal code processed by trackobject goes through a secure, ephemeral sandbox. We never store the shipping addresses or tracking histories on our servers. Your customers' logistical details remain completely private and isolated.

Stream real-time Brazilian shipping rates and package tracking directly into your React or Next.js frontend with Vercel AI SDK.

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Connect Correios API (REST) MCP to Vercel AI SDK

Create your Vinkius account to connect Correios API (REST) to Vercel AI SDK and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Correios API (REST) with Vercel AI SDK

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Live shipping calculations in your UI

Your users don't want to wait for a full page reload just to see what shipping costs. When you hook this MCP Server to your Next.js frontend, your AI client can trigger `calculate_price_deadline` on the fly. The shipping cost and delivery window stream straight to the screen. Because this runs on edge-compatible infrastructure, the latency is practically non-existent. You get raw JSON from the Brazilian postal service transformed into instant UI elements before the user even thinks about clicking away.

Real-time package tracking feeds

Keep buyers on your page instead of sending them to third-party tracking sites. Pass the tracking code to `track_object` within your Vercel AI SDK streaming loop. The agent pulls the latest status updates and renders them as they land. If a package gets stuck in Curitiba, your interface displays that update instantly. You write the prompt, and the SDK handles the UI rendering while the data flows.

Zero-lag checkout assistants

Nobody likes a laggy checkout flow. By linking an MCP Server connection to your Edge Functions, you can feed Brazilian postal data straight to your user-facing chat interface. The client calculates custom pricing for Correios services without hitting cold start delays. You just call the tools method and pass it to your text generation function. The setup takes minutes, and your customers get immediate, accurate delivery estimates.

Setup guide

Set up Correios API (REST) MCP in Vercel AI SDK

Prerequisites

Node.js 18+ and a TypeScript project
ai + @modelcontextprotocol/sdk packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies

Run npm install ai @modelcontextprotocol/sdk plus your preferred model provider (e.g. @ai-sdk/openai).
2

Create the Streamable HTTP transport

Use StreamableHTTPClientTransport with your Vinkius endpoint URL. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Discover and use tools

Call mcpClient.tools() to auto-discover all Correios API (REST) tools. Pass them directly to generateText() or streamText() — no manual schema definitions needed.
4

Works with any model provider

Swap openai("gpt-4o") for any AI SDK provider — Anthropic, Google, Mistral. The MCP tools work identically across all supported models.

index.ts

import { experimental_createMCPClient as createMCPClient } from "ai";
import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/streamableHttp";
import { generateText } from "ai";
import { openai } from "@ai-sdk/openai";

const transport = new StreamableHTTPClientTransport(
  new URL("https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp")
);

const mcpClient = await createMCPClient({ transport });
const tools = await mcpClient.tools();

const { text } = await generateText({
  model: openai("gpt-4o"),
  tools,
  prompt: "List recent Correios API (REST) transactions",
});

console.log(text);
await mcpClient.close();

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Correios. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Correios API (REST) MCP in Vercel AI SDK

You install the MCP client package and initialize it using the Vinkius endpoint URL. Pass the tools directly into your streamText function. Your application can now access the Brazilian postal tools instantly.

Yes, this setup is fully compatible with edge runtimes. The connection uses lightweight HTTP transport to avoid cold starts. You get fast responses for shipping calculations and tracking checks.

Absolutely. The SDK streams the tool call output as it resolves, letting you render tracking updates incrementally. Your users see the delivery status populate without waiting for the entire payload to resolve.

Vinkius manages the Correios credentials on its secure backend. Your frontend code only needs a single Vinkius access token. You don't have to worry about exposing raw API keys to the client side.

Every tracking code and postal code processed by `track_object` goes through a secure, ephemeral sandbox. We never store the shipping addresses or tracking histories on our servers. Your customers' logistical details remain completely private and isolated.

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