OneSimpleAPI MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with OneSimpleAPI MCP or direct API to generate QR codes, convert web pages to PDFs, validate data, manage URLs, and process files through natural language.

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Api Key

OneSimpleAPI is a utility API platform for web content, images, PDFs, QR codes, URL tools, validation, exchange rates, and file management. It gives developers one simple API key for many common backend tasks.

15 Tools

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

TOOL ROUTER PLAYGROUND
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TOOLS

Supported Tools

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

Analyze Readability

Analyze text for readability, grade level, reading time, difficult-word counts, and sentiment.

Calculate PPP Discount

Calculate a purchasing-power-parity discount and localized price between an origin and a destination country.

Capture Screenshot

Capture a webpage URL or raw HTML as a hosted screenshot and return its URL and rendering metadata.

Convert Currency

Convert an amount between supported currencies and return the converted value and exchange rate.

Create Short URL

Create a OneSimpleAPI short URL with optional one-time-use, redirect, query-forwarding, and active-date controls.

Delete File

Delete a generated OneSimpleAPI file by its hosted URL and return the updated file record.

Expand Short URL

Resolve a shortened URL and return its final URL, redirect count, and redirect trace.

Generate or Convert Color

Generate a deterministic color palette from text or convert a supplied color into HEX, RGB, HSL, and related palette values.

Generate PDF

Generate a PDF from either a webpage URL or raw HTML and return the hosted PDF URL and page metadata.

Generate QR Code

Generate a hosted PNG or SVG QR code for a message and return its URL.

Get Image Information

Extract dimensions, image metadata, EXIF camera fields, and available GPS details from an image URL.

List Files

Return one page of generated files owned by the connected account, optionally filtered by live or deleted status.

List Short URLs

Return one page of OneSimpleAPI short URLs and their click statistics.

Transform Image

Resize, crop, rotate, flip, filter, border, optimize, and host an image, returning the generated image URL and metadata.

Validate Email

Validate an email address and assess its domain, MX records, deliverability, disposability, role status, and registration safety.

SETUP GUIDE

Connect OneSimpleAPI 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: ["onesimpleapi"],
  mcp: true,
});
Create a session scoped to OneSimpleAPI 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: "Generate a QR code for https://example.com/pricing and return the image URL",
  stopWhen: stepCountIs(10),
});

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

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

Run OneSimpleAPI tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Generate a QR code for https://example.com/pricing and return the image URL" }],
});

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

Why Use Composio?

AI Native OneSimpleAPI Integration

  • Supports both OneSimpleAPI MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable tool execution
  • Rich coverage for web utilities like PDFs, QR codes, URL tools, validation, exchange rates, and file handling

Managed Auth

  • Store OneSimpleAPI API keys securely instead of hard-coding them in agent code
  • Central place to manage, scope, and revoke OneSimpleAPI access
  • Per user and per environment credentials so development, staging, and production stay cleanly separated

Agent Optimized Design

  • Tools are shaped so AI agents can pick the right OneSimpleAPI utility without guesswork
  • Clear inputs and outputs help agents generate QR codes, convert pages, validate data, and handle files more reliably
  • 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 OneSimpleAPI
  • Scoped, least privilege access to OneSimpleAPI utility actions
  • Full audit trail of agent actions to support review and compliance
FAQ

Frequently asked questions

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

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

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

With Composio, you connect OneSimpleAPI 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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