Zerobounce MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Zerobounce MCP or direct API to validate email addresses, check inbox activity, remove risky contacts, and monitor deliverability through natural language.

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ZeroBounce is an email validation and deliverability platform that detects invalid or risky email addresses. It helps businesses improve email marketing results by ensuring emails actually reach real people.

20 Tools

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Type what you want done — sign in and watch it run live in the Tool Router playground.

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TOOLS

Supported Tools

Every Zerobounce action and event your agent gets out of the box.

Get Activity Data

Tool to get activity data (opens, clicks, etc.

AI Scoring Single Email

Tool to score a single email address using ZeroBounce AI.

Allow or Block List

Tool to manage allowlist and blocklist for email validation.

Batch Validate Emails

Tool to validate a batch of email addresses in real time.

Delete AI Scoring File

Tool to remove a completed AI scoring file from ZeroBounce servers.

Delete file

Tool to delete a file that was submitted for bulk validation.

Domain Search File Status

Tool to get the processing status of a file submitted for bulk domain search.

Domain Search Get File

Tool to download the results file for a completed bulk domain search job.

Domain Search Send File

Tool to upload a file for bulk domain search.

Domain Search Single

Tool to identify common email address formats for a given domain.

Delete Email Finder File

Tool to delete a file that was submitted for bulk email finding.

Email Finder File Status

Tool to get the processing status of a file submitted for bulk email finding.

Email Finder Send File

Tool to upload a file for bulk email finding.

Get API Usage

Tool to retrieve API usage statistics for a given period.

Get Credit Balance

Tool to retrieve your current ZeroBounce email validation credit balance.

Get Email Finder File

Tool to download the results file for a completed bulk email finder job.

List Evaluator

Tool to evaluate the quality of an email list.

List Filters

Tool to retrieve all email addresses and domains in your allowlist and blocklist filters.

Send File

Tool to upload a file for bulk email validation.

Validate Email

Tool to validate a single email address in real time.

SETUP GUIDE

Connect Zerobounce MCP Tool with your Agent

1

Install Composio

typescript
npm install @composio/core ai @ai-sdk/mcp @ai-sdk/openai
Install the Composio SDK and your agent framework
2

Create a session with MCP enabled

typescript
import { Composio } from "@composio/core";

const composio = new Composio();
const { mcp } = await composio.create("your-user-id", {
  toolkits: ["zerobounce"],
  mcp: true,
});
Create a session scoped to Zerobounce and read its MCP URL and headers
3

Connect your agent to the MCP server

typescript
import { createMCPClient } from "@ai-sdk/mcp";
import { openai } from "@ai-sdk/openai";
import { generateText, stepCountIs } from "ai";

const client = await createMCPClient({
  transport: { type: "http", url: mcp.url, headers: mcp.headers },
});

const { text } = await generateText({
  model: openai("gpt-5.6-sol"),
  tools: await client.tools(),
  prompt: "Validate a batch of emails for deliverability.",
  stopWhen: stepCountIs(10),
});

console.log(text);
await client.close();
Pass the session's MCP URL and headers to your agent and run a Zerobounce request
SETUP GUIDE

Connect Zerobounce API Tool with your Agent

1

Install Composio

typescript
npm install @composio/core @composio/openai openai
Install the Composio SDK, the OpenAI provider, and the OpenAI SDK
2

Create a Composio session

typescript
import OpenAI from "openai";
import { Composio } from "@composio/core";
import { OpenAIResponsesProvider } from "@composio/openai";

const composio = new Composio({ provider: new OpenAIResponsesProvider() });
const client = new OpenAI();

const session = await composio.create("your-user-id", { toolkits: ["zerobounce"] });
const tools = await session.tools();
Initialize Composio with the OpenAI Responses provider and create a session scoped to Zerobounce
3

Run Zerobounce tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Validate a batch of emails for deliverability." }],
});

while (response.output.some((o) => o.type === "function_call")) {
  const outputs = await composio.provider.handleToolCalls(session, response.output);
  response = await client.responses.create({
    model: "gpt-5.6-sol",
    tools,
    previous_response_id: response.id,
    input: outputs,
  });
}

console.log(response.output_text);
Send a request, execute the Zerobounce tool calls through the session, and print the final answer

Why Use Composio?

AI Native Zerobounce Integration

  • Supports both Zerobounce MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable tool execution
  • Rich coverage for validating and querying your Zerobounce data

Managed Auth

  • Built-in API Key management and rotation for Zerobounce
  • Central place to manage, scope, and revoke Zerobounce access
  • Per user and per environment credentials instead of hard-coded keys

Agent Optimized Design

  • Tools are tuned using real error and success rates to improve reliability over time
  • Comprehensive execution logs so you always know what ran, when, and on whose behalf

Enterprise Grade Security

  • Fine-grained RBAC so you control which agents and users can access Zerobounce
  • Scoped, least privilege access to Zerobounce resources
  • Full audit trail of agent actions to support review and compliance

Rolling this out across your team?

Give your team centralized access control across every framework with Composio’s MCP Gateway.

EXPLORE MCP GATEWAY
FAQ

Frequently asked questions

Yes, Zerobounce requires you to configure your own API key credentials. Once set up, Composio handles secure credential storage and API request handling for you.

Yes! Composio's Tool Router enables agents to use multiple toolkits. Learn more.

Yes. Composio is SOC 2 Type II compliant and is built to keep your Zerobounce connection and credentials secure. OAuth tokens and API keys are encrypted, and sensitive customer data is protected at rest and in transit.

Composio also undergoes independent security testing and continuously monitors its systems for security threats. You can review the latest reports and policies in the Composio Trust Center.

Composio maintains and updates all toolkit integrations automatically, so your agents always work with the latest API versions.

Create the key in your Zerobounce account settings, then paste it once on Composio's connection page. Composio stores it encrypted and uses it only for the Zerobounce actions your agent runs. Nobody else in your workspace can read it, and you can revoke it inside Zerobounce at any time.

When you connect a Zerobounce account through Composio, every action runs under that account, so anything the agent creates, sends, or changes shows up in Zerobounce as done by you. Keep an approval step in your prompt for actions with side effects, such as sending or deleting, and have the agent draft first.

Whatever the credentials you connect allow inside Zerobounce. If Zerobounce lets you scope a key to specific permissions, create a scoped one so the agent can only do what you intend. You can revoke the key inside Zerobounce at any time.

Yes. Composio supports multiple connected accounts for the same app, and that works in Claude, ChatGPT, or any other assistant you connect through Composio. Give each Zerobounce connection a name such as work or personal, and the assistant uses the one you mention in the request. Each account keeps its own credentials and nothing is merged.

The connection stops working the moment Zerobounce rejects the old key. Create a new key in Zerobounce and reconnect the account from the Composio dashboard or by asking your agent to reconnect Zerobounce. Nothing else changes.

Composio's free Hobby plan includes 100,000 tool calls per month with no credit card, which covers most personal Zerobounce use. Paid plans add higher limits and team features. Your Zerobounce plan and its API limits still apply as usual.

Built-in connectors usually give one AI access to a limited set of apps. Many people use Composio because it lets their AI connect to more apps than it normally supports, or connect to multiple accounts for the same app (e.g. connect Claude to multiple Zerobounce accounts).

With Composio, you connect Zerobounce once and then use it across different AI assistants without setting it up separately in each one. Connect your apps to Composio once, then connect Composio to whichever AI you use, whether that's Claude, ChatGPT, Hermes, or your own custom assistant.

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