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CapSolver MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with CapSolver MCP or direct API to create CAPTCHA tasks, poll for solutions, check account balances, and submit solution feedback through natural language.

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CapSolver logoCapSolver
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CapSolver is a CAPTCHA-solving service with APIs for recognition and token workflows. It helps developers automate CAPTCHA challenges with fast, programmable task handling.

16 Tools

Try CapSolver now

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

TOOL ROUTER PLAYGROUND
CapSolver
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TOOLS

Supported Tools

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

Classify AWS WAF Image

Classify one AWS WAF challenge image or a nine-image grid and return the immediate geometric or object result.

Classify reCAPTCHA V2 Image

Classify a reCAPTCHA v2 challenge image for a documented object category and return the immediate selection result.

Get Balance

Return the connected CapSolver account balance and non-secret package metadata.

Get Task Result

Get one asynchronous CapSolver task result, or optionally poll it every three seconds for a bounded time.

Run Vision Engine

Run one documented CapSolver vision module and return its immediate points, distance, angle, rectangles, or text result.

Solve AWS WAF

Create one AWS WAF token task with or without a caller-supplied proxy and optionally poll every three seconds for a bounded time.

Solve BotDeflector

Create exactly one proxyless BotDeflector task from a target flow token and optionally poll every three seconds for a bounded time.

Solve Cloudflare Challenge

Create one Cloudflare challenge task through a sticky caller-supplied proxy and optionally poll every three seconds for bounded clearance output.

Solve Cloudflare Turnstile

Create one proxyless Cloudflare Turnstile task and optionally poll every three seconds for a bounded time.

Solve DataDome

Create exactly one DataDome slider task with a caller-supplied proxy and optionally wait a bounded time for its solution cookie.

Solve GeeTest

Create one GeeTest v3 or v4 token task and optionally poll every three seconds for a bounded time.

Solve Image To Text

Recognize text or number answers from base64-encoded images and return the immediate recognition result.

Solve MTCaptcha

Create one proxyless or caller-proxied MTCaptcha token task and optionally poll every three seconds for a bounded time.

Solve reCAPTCHA V2

Solve one standard or enterprise reCAPTCHA v2 challenge in task or synchronous mode.

Solve reCAPTCHA V3

Solve a standard, enterprise, or M1 reCAPTCHA v3 challenge in task or synchronous mode.

Submit Task Feedback

Report whether a previously returned CapSolver token worked, using only the documented minimal task and result fields.

SETUP GUIDE

Connect CapSolver 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: ["capsolver"],
  mcp: true,
});
Create a session scoped to CapSolver 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: "Check my CapSolver account balance",
  stopWhen: stepCountIs(10),
});

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

Connect CapSolver 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: ["capsolver"] });
const tools = await session.tools();
Initialize Composio with the OpenAI Responses provider and create a session scoped to CapSolver
3

Run CapSolver tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Check my CapSolver account balance" }],
});

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 CapSolver tool calls through the session, and print the final answer

Why Use Composio?

AI Native CapSolver Integration

  • Supports both CapSolver MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable task creation and solution polling
  • Rich coverage for CAPTCHA tasks, account balances, and solution feedback

Secure API Key Auth

  • Connect CapSolver with securely stored API key credentials
  • Central place to manage, scope, and revoke CapSolver 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 CapSolver
  • Scoped, least privilege access to CapSolver resources
  • Full audit trail of agent actions to support review and compliance
FRAMEWORKS

Use CapSolver with any AI Agent Framework

Choose a Framework you want to connect CapSolver with

ChatGPT logo

ChatGPT

Use CapSolver MCP with ChatGPT

Claude Cowork logo

Claude Cowork

Use CapSolver MCP with Claude Cowork

Hermes logo

Hermes

Use CapSolver MCP with Hermes

Atomic Agent logo

Atomic Agent

Use CapSolver MCP with Atomic Agent

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

When you connect a CapSolver account through Composio, every action runs under that account, so anything the agent creates, sends, or changes shows up in CapSolver 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 CapSolver. If CapSolver 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 CapSolver 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 CapSolver 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 CapSolver rejects the old key. Create a new key in CapSolver and reconnect the account from the Composio dashboard or by asking your agent to reconnect CapSolver. Nothing else changes.

Composio's free Hobby plan includes 100,000 tool calls per month with no credit card, which covers most personal CapSolver use. Paid plans add higher limits and team features. Your CapSolver 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 CapSolver accounts).

With Composio, you connect CapSolver 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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